PRESSURE SENSITIVE ADHESIVES

Abstract

The present invention relates to a formulation comprising: i) an aqueous polymer dispersion comprising: a) at least one homo- or copolymer P containing in the form of polymerized units at least one ethylenically unsaturated monomer; b) at least 6% by weight, based on the total of the ethylenically unsaturated monomer, of at least one saccharide-compound S; wherein in a) the at least one homo- or copolymer P is obtained by polymerization of the at least one ethylenically unsaturated monomer in the presence of at least a part of the at least one saccharide-compound S from b); ii) at least one tackifier.

Claims

1. A formulation, comprising: i) an aqueous polymer dispersion, comprising: a) at least one homo- or copolymer P comprising, in the form of polymerized units, at least one ethylenically unsaturated monomer, wherein as the at least one ethylenically unsaturated monomer a monomer mixture is employed, consisting of: a1) 65% to 99.8% by weight of at least one monomer A, wherein said monomer A is at least one C.sub.2-C.sub.12 alkyl acrylate; a2) 0.1% to 30% by weight of at least one monomer B selected from the group consisting of a methyl acrylate, a C.sub.1-C.sub.12 alkyl methacrylate, a C.sub.1-C.sub.12 alkyl methacrylate derivate, a vinylaromatic monomer, and a vinyl ester of an aliphatic C.sub.2-C .sub.10 carboxylic; a3) 0% to 10% by weight of at least one monomer C, wherein said monomer C is a monoethylenically unsaturated monomer having at least one hydroxyalkyl group; a4) 0.1% to 5% by weight of at least one monomer D, wherein said monomer D is a monoethylenically unsaturated monomer having at least one acid group, wherein the total of monomers A to D equals 100% by weight, and b) at least 6% by weight, based on the total of monomers A to D, of the at least one saccharide-compound S; wherein in a) the at least one homo- or copolymer P is obtained by polymerization of the at least one ethylenically unsaturated monomer in the presence of at least a part of the at least one saccharide-compound S from b); ii) at least one tackifier.

2. The formulation according to claim 1, wherein the saccharide-compound S is at least one member selected from the group consisting of starch, cellulose, guar gum, xanthan gum, alginate, pectin, chitosan, gum arabic, and gellan gum.

3. The formulation according to claim 1, wherein the saccharide-compound S is starch, a starch derivative, and/or a substitution product thereof.

4. The formulation according to claim 1, wherein the formulation is an aqueous formulation.

5. The formulation according to claim 1, wherein the solid content in the polymer dispersion is 5 to 90% by weight.

6. The formulation according to claim 1, wherein the tackifier is at least one member selected from the group consisting of a natural resin, a hydrocarbon resin, and a polyacrylate.

7. The formulation according to claim 1, comprising: i) 50 to 95% by weight of the polymer dispersion, ii) 5 to 50% by weight of at least one tackifier, iii) 0 to 3% by weight of at least one surfactant, and iv) 0 to 10% by weight of an additive, wherein the total of the compounds of i) to iv) equals 100%.

8. The formulation according to claim 1, comprising i) 15 to 90% by weight of the polymer dispersion, ii) 5 to 50% by weight of at least one tackifier, iii) 0 to 3% by weight of at least one surfactant, and iv) 0 to 10% by weight of at least one additive, v) 5 to 80% by weight of at least one further polymer dispersion v), which is different from the aqueous polymer dispersion i), wherein the total of the compounds of i) to v) equals 100%.

9. The formulation according to claim 1, wherein the polymer dispersion v) comprises al) at least one homo- or copolymer P1 containing in the form of polymerized units at least one monomer selected from the group consisting of a C.sub.1-C.sub.12 alkyl acrylate, a C.sub.1-C.sub.12 alkyl methacrylate, styrene,1,4-butadiene, ethylene, and vinyl acetate.

10. A process for preparing a formulation according to claim 1, comprising a free-radical aqueous emulsion polymerization of monomers of the at least one ethylenically unsaturated monomer of which the at least one homo- or copolymer P is composed by a monomer feed process, whereby 0 to 50% of the ethylenically unsaturated monomers, based on the total amount of the monomers to be polymerized, are added under polymerization conditions to 0 to 100% of the at least one saccharide-compound S, based on the total amount of the monomers to be polymerized, and at least the rest of the at least one ethylenically unsaturated monomers and the at least one saccharide-compound S are added in the course of the polymerization.

11-12. (canceled)

13. A self-adhesive sheet, a self-adhesive tape, a self-adhesive label, or a wash-off label comprising the formulation according to claim 1.

14. An adhesive, comprising a formulation according to claim 1.

15. The adhesive according to claim 13, which is a pressure sensitive adhesive.

Description

EXAMPLES

Process AConventional Emulsion Polymerization (Not Inventive)

Example Benchmark (Not Inventive)

[0187] Monomer composition: 79.5 pphm EHA, 8 pphm MMA, 8 pphm VAc, 2 pphm HPA, 2 pphm Sty, 0.5 pphm AA

[0188] A glass reactor, equipped with blade stirrer, feed dosing system, thermocouple and a reflux condenser, was charged at room temperature with a mixture of 220.3 g demineralized water, 0.29 g ascorbic acid and 5.2 g of a polystyrene seed polymer dispersion (particle size approx. 30nm, 33 wt. % solids contents). Two feed mixtures were prepared: a) Feed 1 consisted of 243.5 g demin. water, 17.8 g Disponil FES 77 (32 wt. % solution), 2.53 g Dowfax 2A1 (45 wt. % solution), 4.6 g sodium hydroxide (25 wt. % solution), 2.9 g acrylic acid, 11.4 g 2-hydroxypropyl acrylate, 11.4 g styrene, 45.6 g methyl methacrylate, 45.6 g vinyl acetate, 453.2 g 2-ethylhexyl acrylate. b) Feed 2 consisted of 32.6 g sodium peroxodisulfate (7 wt. % solution).

[0189] The reactor was flushed with nitrogen and heated to 85 C. upon which 20% of feed 2 was added within 2 min. After 15 min stirring, the remainder of feeds 1 and 2 were started simultaneously and were added to the reactor according to the following pattern while keeping the temperature constant at 85 C.: a) remainder of feed 1 in 180 min, b) remainder of feed 2 in 210 min. After end of feed 2, 19.8 g of demin. water were added, followed by stirring for 10 min at 85 C. At constant temperature, 5.7 g of tert.-Butylhydroperoxide (10 wt. % solution) and 7.0 g of Sodium acetonbisulfite (13.1 wt. % solution) were added over the course of 60 min. 4.9 g of Lumiten I-SC (58 wt. % solution) were added within 15 min and stirred in for another 15 min. 16.2 g of demin. water were added and the obtained product cooled to room temperature. 0.8 g of Acticid MV (1.5 wt. % solution, Thor GmbH) and additional 21.9 g demin. water were stirred in.

[0190] The obtained polymer dispersion had a solid content of 49.2% and a viscosity of 135 mPas.

[0191] 75 parts dispersion were mixed with 25 parts tackifier Snowtack SE780G (calculated on dry basis) according to description of Process F.

Process BFormulation with Saccharide Compound (Not Inventive)

Example Comparison 1 (Not Inventive)

[0192] An aliquot of the polymer dispersion Benchmark made according to Process A was adjusted to pH of 7 with NaOH (10 wt. % solution). Saccharide compound 51 solution (Cargill C*Plus 10998, 50 wt. % solution) was added in a ratio of 20 parts Saccharide compound to 80 parts polymer dispersion (calculated on dry basis) to obtain a polymer/saccharide compound blend.

[0193] 75 parts dispersion were mixed with 25 parts tackifier Snowtack SE780G (calculated on dry basis) according to description of Process F.

Process CSaccharide Compound in Initial Charge (Inventive)

Example E2 (Inventive)

[0194] Monomer composition: 79.5 pphm EHA, 8 pphm MMA, 8 pphm VAc, 2 pphm HPA, 2 pphm Sty, 0.5 pphm AA; 20 pphm saccharide compound 51

[0195] A glass reactor, equipped with blade stirrer, feed dosing system, thermocouple and a reflux condenser, was charged at room temperature with a mixture of 161.7 g demineralized water, 0.29 g ascorbic acid and 228.0 g of saccharide compound 51 solution (Cargill C*Plus 10998, 50 wt. % solution). Two feed mixtures were prepared: a) Feed 1 consisted of 245.4 g demin. water, 17.8 g Disponil FES 77 (32 wt. % solution), 2.53 g Dowfax 2A1 (45 wt. % solution), 4.6 g sodium hydroxide (25 wt. % solution), 2.9 g acrylic acid, 11.4 g 2-hydroxypropyl acrylate, 11.4 g styrene, 45.6 g methyl methacrylate, 45.6 g vinyl acetate, 453.2 g 2-ethylhexyl acrylate. b) Feed 2 consisted of 91.2 g sodium peroxodisulfate (2.5 wt. % solution).

[0196] The reactor was flushed with nitrogen and heated to 85 C. upon which 5% of feed 1 was added within 2 min, then 20% of feed 2 was added within 2 min at the same temperature. The remainder of feeds 1 and 2 were started simultaneously and were added to the reactor according to the following pattern while keeping the temperature constant at 85 C.: a) remainder of feed 1 in 180 min, b) remainder of feed 2 in 210 min. After end of feed 2, 19.8 g of demin. water were added, followed by stirring for 10 min at 85 C.

[0197] At constant temperature, 5.7 g of tert.-Butylhydroperoxide (10 wt. % solution) and 7.0 g of Sodium acetonbisulfite (13.1 wt. % solution) were added over the course of 60 min. 4.9 g of Lumiten I-SC (58 wt. % solution) were added within 15 min and stirred in for another 15 min. 16.2 g of demin. water were added and the obtained product cooled to room temperature. 0.8 g of Acticid MV (1.5 wt. % solution) and additional 21.9 g demin. water were stirred in. The obtained polymer dispersion had a pH-value of 5.5, a solid content of 49.8% and a viscosity of 450 mPas.

[0198] 75 parts dispersion were mixed with 25 parts tackifier Snowtack SE780G (calculated on dry basis) according to description of Process F.

Process DSaccharide Compound in Feed (Inventive)

Example E40 (Inventive)

[0199] Monomer composition: 79.5 pphm EHA, 8 pphm MMA, 8 pphm VAc, 2 pphm HPA, 2 pphm Sty, 0.5 pphm AA; 20 pphm saccharide compound 51

[0200] A glas reactor, equipped with blade stirrer, feed dosing system, thermocouple and a reflux condenser, was charged at room temperature with a mixture of 200.0 g demineralized water and 0.58 g ascorbic acid. Two feed mixtures were prepared: a) Feed 1 consisted of 329.5 g demin. water, 422.3 g of saccharide compound 51 solution (Cargill C*Plus 10998, 54 wt. % solution), 35.6 g Disponil FES 77 (32 wt. % solution), 5.1 g Dowfax 2A1 (45 wt. % solution), 9.1 g sodium hydroxide (25 wt. % solution), 5.7 g acrylic acid, 22.8 g 2-hydroxypropyl acrylate, 22.8 g styrene, 91.2 g methyl methacrylate, 91.2 g vinyl acetate, 906.3 g 2-ethylhexyl acrylate. b) Feed 2 consisted of 69.3 g sodium peroxodisulfate (7 wt. % solution).

[0201] The reactor was flushed with nitrogen and heated to 85 C. upon which 17,9 g NaPS (7 wt. % solution) were added. After 10 min step by step feed 1 was added in different feeding speeds: 8.2 gin 6 min, then 73.6 gin 22 min, then 147.2 gin 22 min, then 220.8 gin 22 min, finally the rest of feed 1 1491.9 g in 138 min. The remainder of feed 2 was started simultaneously and was added to the reactor in 210 min while keeping the temperature constant at 85 C. After end of feed 1 and feed 2 an amount of 40 g of demin. water were added, followed by stirring for 10 min at 85 C. At constant temperature, 12.4 g of tert.-Butylhydroperoxide (10 wt. % solution) and 15.1 g of Sodium acetonbisulfite (13.1 wt. % solution) were added over the course of 60 min. 10.7 g of Lumiten I-SC (58 wt. % solution) were added within 15 min and stirred in for another 15 min.

[0202] 40 g of demin. water were added and the obtained product cooled to room temperature. 1.7 g of Acticid MV (1.5 wt. % solution) and additional 21.9 g demin. water were stirred in. The obtained polymer dispersion had a solid content of 59.0% and a viscosity of 794 mPas.

[0203] 75 parts dispersion were mixed with 25 parts tackifier Snowtack SE780G (calculated on dry basis) according to description of Process F.

Process FGeneral Procedure to Blend the Tackifier with a Dispersion

[0204] 75 parts dispersion were mixed with 25 parts tackifier Snowtack SE780G (calculated on dry basis). In addition, the pH value was adjusted to pH=7 with NaOH (8%), Lumiten I-SC the defoamer Tage 2263 were added as well. Example for a formulation:

[0205] 204.4 g of the polymer dispersion of example E2 (49.8 wt. %) were put in a 500 ml beaker. While stirring (400 rpm) firstly 0.1 g Tage 2263 (10%) and 2.1 g Lumiten ISC (58%) were added at room temperature followed by the addition of 61.7 g tackifier Snowtack SE780G (55%). The pH was adjusted to about pH=8 by the addition of 2.2 g NaOH (8%). Finally 0.2 g Aciticide MV (1.5%) and 9.2 g water were added. The blend was stirred for about 10 min and was let to sit at least 16 hours before preparing testing laminates. The solid content was about 49%.

TABLE-US-00001 TABLE 1 Benchmark and comparative examples, composition and process Composition and Process Polymer dispersion PSA Saccharide Solid formulation Product compound Monomers content Viscosity Tackifier Example pphm type in pphm % mPas parts type Process Benchmark none 79.5 EHA/8 MMA/8 49.21 135 25 Snt A VAc/2 HPA/2 S/0.5 AA 780 G Comparison 1 20 S1 79.5 EHA/8 MMA/8 49.8 25 Snt B VAc/2 HPA/2 S/0.5 AA 780 G Comparison 2 10 S1 79.5 EHA/8 MMA/8 49.1 600 none C VAc/2 HPA/2 S/0.5 AA Comparison 3 20 S1 79.5 EHA/8 MMA/8 49.8 450 none C VAc/2 HPA/2 S/0.5 AA Comparison 4 30 S1 79.5 EHA/8 MMA/8 49.2 60 none C VAc/2 HPA/2 S/0.5 AA Comparison 5 40 S1 79.5 EHA/8 MMA/8 49.5 40 none C VAc/2 HPA/2 S/0.5 AA

TABLE-US-00002 TABLE 2 Benchmark and comparative examples, application properties Application properties Shear Peel resistance at Loop Tack in resistance 90 in N per 25 mm Product N per 25 mm in h HDPE Steel Example HDPE Steel Steel 20 min 20 min Benchmark 8.9 A 15.8 A 2.0K 5.4 A 7.1 A Comparison 1 2.5 A 2.7 A 1.9K 5.1 A 2.7 A transfer transfer transfer transfer Comparison 2 6.7 A 10.2 A >200 5.3 A 7.0 A Comparison 3 6.2 A 8.7 A >200 5.2 A 6.5 A Comparison 4 transfer from release liner no more possible Comparison 5 transfer from release liner no more possible

[0206] Using large amounts of saccharide compound in PSA formulation yields unfavorable application properties as demonstrated in Table 2. Blending saccharide compound with a conventional polymer dispersion typically leads to poor performance with low loop tack and peel resistance as can be seen for Comparison 1. Using saccharide compound during the polymerization process increases shear resistance, but the PSA exhibit too little adhesion when large amounts are employed. In particular samples Comparison 4 and 5 with large amounts of saccharide compound have lost their adhesiveness and thus their suitability as a PSA formulation altogether.

TABLE-US-00003 TABLE 3 Inventive examples, composition and process Composition and Process Polymer dispersion PSA Saccharide Solid formulation Product compound Monomers content Viscosity Tackifier Example pphm type in pphm % mPas parts type Process E1 10 S1 79.5 EHA/8 MMA/8 49.1 25 Snt C VAc/2 HPA/2 S/0.5 AA 780 G E2 20 S1 79.5 EHA/8 MMA/8 49.8 25 Snt C VAc/2 HPA/2 S/0.5 AA 780 G E3 30 S1 79.5 EHA/8 MMA/8 49.2 25 Snt C VAc/2 HPA/2 S/0.5 AA 780 G E4 40 S1 79.5 EHA/8 MMA/8 49.5 25 Snt C VAc/2 HPA/2 S/0.5 AA 780 G

TABLE-US-00004 TABLE 4 Inventive examples, application properties Application properties Shear Peel resistance at Loop Tack in resistance 90 in N per 25 mm Product N per 25 mm in h HDPE Steel Example HDPE Steel Steel 20 min 20 min E1 12.5 A 14.9 A 59.3K 6.1 A 10.1 A E2 11.3 A 13.2 A 42.5K 6.3 A .sup.9.9PT E3 10.6 A 11.3 A 59.2K 6.2 A 9.8 A E4 10.9 A 8.8 A 25.5K 6.1 A 9.7 A

[0207] Surprisingly, very large amounts of saccharide compound can be incorporated advantageously in PSA formulations by using the inventive process. Well-balance adhesive profiles are obtained when the emulsion polymerization is carried out in the presence of inventive saccharide compounds and the resulting polymer dispersions are formulated with suitable tackifier dispersions.

TABLE-US-00005 TABLE 5 Composition and Process Polymer dispersion PSA Saccharide Solid formulation Product compound Monomers content Viscosity Tackifier Example pphm type in pphm % mPas parts type Process E5 20 S1 79.5 EHA/8 MMA/8 49.1 616 25 Snt C VAc/2 HPA/2 S/0.5 AA 780 G E6 20 S1 79.5 EHA/8 MMA/8 49.86 2115 25 Snt C VAc/2 HPA/2 S/0.5 AA 780 G E7 20 S1 79.5 EHA/8 MMA/8 48.95 760 25 Snt C VAc/2 HPA/2 S/0.5 AA 780 G E8 20 S1 79.5 EHA/8 MMA/8 49.17 602 25 Snt C VAc/2 HPA/2 S/0.5 AA 780 G

TABLE-US-00006 TABLE 6 Application properties Shear Peel resistance at Loop Tack in resistance 90 in N per 25 mm Product N per 25 mm in h HDPE Steel Example HDPE Steel Steel 20 min 20 min E5 7.9 A 15.4 A 45.2K 5.6 A 9.9PT E6 8.8 A 16.2 A 35.9K 5.9 A 9.9PT E7 7.8 A 17.6 A 27.2K 5.7 A 11.5PT E8 8.0 A 16.4 A 50.6K 5.6 A 9.2 A.sup.

Example E5

[0208] The same monomer composition, saccharide compound amount and type and polymerization process was used as for Example E2. The total amount of sodium peroxodisulfate was 0.4 pphm.

Example E6

[0209] The same monomer composition, saccharide compound amount and type and polymerization process was used as for Example E2. The total amount of sodium peroxodisulfate was 0.8 pphm.

Example E7

[0210] The same monomer composition, saccharide compound amount and type and polymerization process was used as for Example E2. The total amount of sodium peroxodisulfate was 1.2 pphm.

Example E8

[0211] The same monomer composition, saccharide compound amount and type and polymerization process was used as for Example E2. The total amount of sodium peroxodisulfate was 0.4 pphm, of which 40% were added into the initial charge before starting the emulsion feed. These examples demonstrate the versatility of the invention in case larger amounts of initiator are desired for production reasons.

TABLE-US-00007 TABLE 7 Composition and Process Polymer dispersion PSA Saccharide Solid formulation Product compound Monomers content Viscosity Tackifier Example pphm type in pphm % mPas parts type Process E9 20 S1 79.5 EHA/8 MMA/8 49.69 1044 25 Snt C VAc/2 HPA/2 S/0.5 AA 780 G E10 20 S1 79.5 EHA/8 MMA/8 49.12 2170 25 Snt C VAc/2 HPA/2 S/0.5 AA 780 G E11 20 S1 79.5 EHA/8 MMA/8 49.53 1970 25 Snt C VAc/2 HPA/2 S/0.5 AA 780 G E12 20 S1 79.5 EHA/8 MMA/8 49.09 402 25 Snt C VAc/2 HPA/2 S/0.5 AA 780 G E13 20 S1 79.5 EHA/8 MMA/8 49.38 2775 25 Snt C VAc/2 HPA/2 S/0.5 AA 780 G

TABLE-US-00008 TABLE 8 Application properties Shear Peel resistance at Loop Tack in resistance 90 in N per 25 mm Product N per 25 mm in h HDPE Steel Example HDPE Steel Steel 20 min 20 min E9 8.4 A 14.9 A 64.9K 5.6 A 10.1PT E10 9.3 A 15.4 A 67.1K 5.8 A 9.9PT E11 7.7 A 15.2 A 83.8K 5.6 A 10.7PT E12 8.0 A 15.3 A 52.7K 5.5 A 9.3 A E13 8.2 A 15.0 A 46.4K 6.1 A 10.6PT

Example E9

[0212] The same monomer composition of the emulsion feed, saccharide compound amount and type and polymerization process was used as for Example E2. Instead of initially charging 5% of the emulsion feed, 5% of pure styrene was charged.

Example E10

[0213] The same monomer composition of the emulsion feed, saccharide compound amount and type and polymerization process was used as for Example E2. Instead of initially charging 5% of the emulsion feed, 5% of pure nBA were charged.

Example E11

[0214] The same monomer composition of the emulsion feed, saccharide compound amount and type and polymerization process was used as for Example E2. Instead of initially charging 5% of the emulsion feed, 5% of pure Methyl acrylate was charged.

Example E12

[0215] The same monomer composition of the emulsion feed, saccharide compound amount and type and polymerization process was used as for Example E2. This time, 2% of the total emulsion feed was initially charged.

Example E13

[0216] The same monomer composition of the emulsion feed, saccharide compound amount and type and polymerization process was used as for Example E2. This time, 10% of the total emulsion feed was initially charged.

TABLE-US-00009 TABLE 9 Composition and Process Polymer dispersion PSA Saccharide Solid formulation Product compound Monomers content Viscosity Tackifier Example pphm type in pphm % mPas parts type Process E14 20 S2 79.5 EHA/8 MMA/8 48.67 518 25 Snt C VAc/2 HPA/2 S/0.5 AA 780 G E15 20 S3 79.5 EHA/8 MMA/8 49.23 163 25 Snt C VAc/2 HPA/2 S/0.5 AA 780 G E16 20 S4 79.5 EHA/8 MMA/8 48.73 204 25 Snt C VAc/2 HPA/2 S/0.5 AA 780 G

TABLE-US-00010 TABLE 10 Application properties Shear Peel resistance at Loop Tack in resistance 90 in N per 25 mm Product N per 25 mm in h HDPE Steel Example HDPE Steel Steel 20 min 20 min E14 8.0 A 14.2 A >200 5.6 A .sup.9.8PT E15 8.1 A 13.4 A 114.9K 5.4 A 7.2 A E16 8.8 A 13.0 A 66.7K 5.8 A 7.4 A

Example E14

[0217] The same polymerization process and monomer composition of the emulsion feed was used as for Example E2. However, a different saccharide compound was used. Thus 20 pphm saccharide compound S2 in powdered form were dissolved directly in the initial charge.

Example E15

[0218] The same polymerization process and monomer composition of the emulsion feed was used as for Example E2. However, this time 20 pphm saccharide compound S3 was used.

Example E16

[0219] The same polymerization process and monomer composition of the emulsion feed was used as for Example E2. However, this time 20 pphm saccharide compound S4 was used. With the inventive process, different saccharide compounds can be used to achieve favorable PSA properties. If desired, the saccharide compound can be directly dissolved in the initial charge.

[0220] Hierzu muss ich noch eine bessere Darstellung/Beschreibung whlen

TABLE-US-00011 TABLE 11 Composition and Process Polymer dispersion PSA Saccharide Solid formulation Further info and Product compound Monomers content Viscosity Tackifier wet-properties Example pphm type in pphm % mPas parts type Process Variations Remark E17 40 S1 79.5 49.22 214 25 Snt C Dispersion overall EHA/8 780 with 40% saccharide MMA/8 G saccahride content in VAc/2 compound dispersion HPA/2 in charge. 14.3% S/0.5 AA Then mixed with 1 part pure dispersion of Benchmark example E18 60 S1 79.5 49.43 178 25 Snt C Dispersion overall EHA/8 780 with 60% saccharide MMA/8 G saccharide content in VAc/2 compound dispersion HPA/2 in charge. 12.5% S/0.5 AA Then mixed with 2 parts pure dispersion of Benchmark example E19 80 S1 79.5 49.53 183.5 25 Snt C Dispersion overall EHA/8 780 with 80% saccharide MMA/8 G saccharide content in VAc/2 compound dispersion HPA/2 in charge. 11.1% S/0.5 AA Then mixed with 3 parts pure dispersion of Benchmark example E20 100 S1 79.5 47.9 25 Snt C Dispersion overall EHA/8 780 with 100% saccharide MMA/8 G saccharide content in VAc/2 compound dispersion HPA/2 in charge. 19% S/0.5 AA Tehn mixed with 4 parts pure Benchmark example

TABLE-US-00012 TABLE 12 Application properties Shear Peel resistance at Loop Tack in resistance 90 in N per 25 mm Product N per 25 mm in h HDPE Steel Example HDPE Steel Steel 20 min 20 min E17 9.7 A 13.3 A 63.3K 5.6 A 7.2 A E18 9.6 A 13.7 A 55.5K 5.5 A 7.3 A E19 9.6 A 14.0 A 47.7K 5.5 A 7.8 A E20 9.3 A 14.3 A >70 5.5 A 7.9 A

Examples E17-E20

[0221] mixtures of saccharide compound-containing and -free dispersions as base for PSA formulations.

TABLE-US-00013 TABLE 13 Composition and Process Polymer dispersion PSA Saccharide Solid formulation Product compound Monomers content Viscosity Tackifier Example pphm type in pphm % mPas parts type Process E21 20 S1 79.5 EHA/8 MMA/8 20 Snt C VAc/2 HPA/2 S/0.5 AA 780 G E22 20 S1 79.5 EHA/8 MMA/8 15 Snt C VAc/2 HPA/2 S/0.5 AA 780 G E23 20 S1 79.5 EHA/8 MMA/8 10 Snt C VAc/2 HPA/2 S/0.5 AA 780 G E24 20 S1 79.5 EHA/8 MMA/8 25 T01 C VAc/2 HPA/2 S/0.5 AA E25 20 S1 79.5 EHA/8 MMA/8 20 T01 C VAc/2 HPA/2 S/0.5 AA E26 20 S1 79.5 EHA/8 MMA/8 15 T01 C VAc/2 HPA/2 S/0.5 AA E27 20 S1 79.5 EHA/8 MMA/8 10 T01 C VAc/2 HPA/2 S/0.5 AA

TABLE-US-00014 TABLE 14 Application properties Shear Peel resistance at Loop Tack in resistance 90 in N per 25 mm Product N per 25 mm in h HDPE Steel Example HDPE Steel Steel 20 min 20 min E21 8.7 A 13.8 A 61.2K 5.8 A 7.8 A E22 7.0 A 11.5 A >200 5.5 A 7.7 A E23 6.7 A 9.1 A >200 5.3 A 7.3 A E24 7.4 A 10.4 A 9.2K 4.8 A 7.8 A E25 6.8 A 8.8 A 36.9K 4.7 A 7.5 A E26 6.6 A 8.9 A >200 4.7 A 7.4 A E27 6.7 A 9.1 A >200 4.3 A 7.2 A

[0222] Suitable polymer dispersions according to the invention can be formulated with a variety of different tackifiers as demonstrated by examples in Tables 13 and 14.

TABLE-US-00015 TABLE 15 Composition and Process Polymer dispersion PSA Saccharide Solid formulation Product compound Monomers content Viscosity Tackifier Example pphm type in pphm % mPas parts type Process E28 20 S1 84.5 EHA/3 48.73 408 25 Snt C MMA/8 780 G VAc/2 HPA/2 S/0.5 AA E29 20 S1 86.5 EHA/1 49.89 774 25 Snt C MMA/8 780 G VAc/2 HPA/2 S/0.5 AA E30 20 S1 79.75 EHA/8 49.4 1434 25 Snt C MMA/8 780 G VAc/2 HPA/2 S/0.25 AA E31 20 S1 79.5 EHA/8 49.18 692 25 Snt C MMA/8 780 G VAc/2 HPA/2 S/0.5 AA E32 20 S1 79.5 EHA/8 49.23 366 25 Snt C MMA/8 780 G VAc/2 HPA/2 S/0.5 AA E33 20 S1 79.5 EHA/8 49.17 172 25 Snt C MMA/8 780 G VAc/2 HPA/2 S/0.5 AA/ 0.25 GMA E34 20 S1 79.5 EHA/8 48.9 108 25 Snt C MMA/8 780 G VAc/2 HPA/2 S/0.5 AA/ 0.5 GMA E35 20 S1 49.5 n-BA/30 49.24 1502 25 Snt C EHA/8 780 G MMA/8 VAc/2 HPA/2 S/0.5 AA E36 20 S1 49.5 n-BA/30 49.58 446 25 Snt C EHA/8 780 G MMA/8 VAc/2 HPA/2 S/0.5 AA

TABLE-US-00016 TABLE 16 Application properties Shear Peel resistance at Loop Tack in resistance 90 in N per 25 mm Product N per 25 mm in h HDPE Steel Example HDPE Steel Steel 20 min 20 min E28 9.0 A 15.1 A 37.3K 5.7 A 8.2 A E29 9.4 A 13.7 A 19.7K 5.5 A 7.8 A E30 8.3 A 13.1 A 26.9K 5.6 A 8.4 A E31 9.5 A 15.2 A 22.1K 6.1 A 7.7 A E32 11.0 A 19.4 A 3.7K 6.8 A 12.1PT E33 8.4 A 13.6 A 44.7K 5.5 A E34 9.3 A 12.3 A 30.7K 5.5 A E35 8.7 A 9.5 A >200 5.5 A 7.6 A E36 9.2 A 12.0 A 108.0K 5.8 A 7.5 A

Example E28

[0223] The same polymerization process and polysacchride S1 amount was used as in for Example

[0224] E2. The monomer composition of the emulsion feed to adjusted to contain 84.5 EHA, 3 MMA, 8 VAc, 2 HPA, 2 S and 0.5 AA.

Example E29

[0225] The same polymerization process and polysacchride S1 amount was used as in for Example

[0226] E2. The monomer composition of the emulsion feed to adjusted to contain 86.5 EHA, 1 MMA, 8 VAc, 2 HPA, 2 S and 0.5 AA.

Example E30

[0227] The same polymerization process and polysacchride S1 amount was used as in for Example

[0228] E2. The monomer composition of the emulsion feed to adjusted to contain 79.75 EHA, 8 MMA, 8 VAc, 2 HPA, 2 S and 0.25 AA.

Example E31

[0229] The same monomer composition, saccharide compound amount and type and polymerization process was used as for Example E2. The emulsion feed additionally contained 0.05 pphm tDMK.

Example E32

[0230] The same monomer composition, saccharide compound amount and type and polymerization process was used as for Example E2. The emulsion feed additionally contained 0.1 pphm tDMK.

Example E33

[0231] The same monomer composition, saccharide compound amount and type and polymerization process was used as for Example E2. The emulsion feed additionally contained 0.25 pphm GMA.

Example E34

[0232] The same monomer composition, saccharide compound amount and type and polymerization process was used as for Example E2. The emulsion feed additionally contained 0.5 pphm GMA.

Example E35

[0233] The same polymerization process and polysacchride S1 amount was used as in for Example E2. The monomer composition of the emulsion feed to adjusted to contain 49.5 n-BA, 30 EHA, 8 MMA, 8 VAc, 2 HPA, 2 S and 0.5 AA. Also, this time, only 2% of the total emulsion feed were initially charged.

Example E36

[0234] The same polymerization process and polysacchride S1 amount was used as in for Example E2. The monomer composition of the emulsion feed to adjusted to contain 84.5 EHA, 3 MMA, 8 VAc, 2 HPA, 2 S and 0.5 AA.

[0235] Samples of Tables 15 and 16 exemplify the versatility of the inventive approach for providing well-balanced PSA formulations with large amount of renewable resources. The polymers can be adjusted to exhibit high cohesive strength or high peel resistance depending on the specific application need.

TABLE-US-00017 TABLE 17 Composition and Process Polymer dispersion PSA Saccharide Solid formulation Product compound Monomers content Viscosity Tackifier Example pphm type in pphm % mPas parts type Process E37 20 S1 79.5 EHA/8 MMA/8 59.21 721 25 Snt D VAc/2 HPA/2 S/0.5 AA 780 G E38 20 S3 79.5 EHA/8 MMA/8 58.51 690 25 Snt D VAc/2 HPA/2 S/0.5 AA 780 G E39 20 S4 79.5 EHA/8 MMA/8 58.56 820 25 Snt D VAc/2 HPA/2 S/0.5 AA 780 G E40 20 S2 79.5 EHA/8 MMA/8 59.04 794 25 Snt D VAc/2 HPA/2 S/0.5 AA 780 G

TABLE-US-00018 TABLE 18 Application properties Shear Peel resistance at Loop Tack in resistance 90 in N per 25 mm Product N per 25 mm in h HDPE Steel Example HDPE Steel Steel 20 min 20 min E37 8.1 A 8.1 A 33.3K 5.5 A E38 10.3 A 9.2 A 74.9K 6.2 A E39 9.4 A 8.9 A 55.6K 6.2 A E40 11.6 A 10.4 A 31.3K 6.2 A 7.1 A

Example E37

[0236] The monomer composition and polymerization process was the same as for Example E40. This time, 20pphm saccharide compound S1 was instead of S2.

Example E38

[0237] The monomer composition and polymerization process was the same as for Example E40. This time, 20pphm saccharide compound S3 was instead of S2.

Example E39

[0238] The monomer composition and polymerization process was the same as for Example E40. This time, 20 pphm saccharide compound S4 was instead of S2.

Examples E37-E40

[0239] demonstrate one way to obtain high solids contents containing polymer dispersions according to the present invention. Other ways will be obvious to the experienced practitioner.

[0240] Wash-off ability was determined for selected samples according to general procedure of the Wash-off test d). A paper label coated with 20 g/m.sup.2 of comparative adhesive Example Benchmark detached after 30 seconds from the glass surface. The adhesive remained attached to the paper label. A label coated with 20 g/m.sup.2 of inventive adhesive Example E2 detached in two stages. First, the paper face stock detached from the bottle after 10 seconds, subsequently the adhesive layer cleanly detached from the glass surface as a single sheet after about 30 seconds. This stepwise detachment may enable a clean separation of paper material and adhesive to improve the paper recycling process.