Use of cellulose ether compounds for increasing the open time and improving the wettability of cement-based mortars

Abstract

The present invention relates to cellulose ether compounds for increasing the open time and improving the wettability of cement-based mortars. The inventive cellulose ether compounds are formed from cellulose ether with one or more liquid antifoams incorporated therein. The inventive cellulose ether compounds are preferably used as modified cellulose ether in dry mortars for increasing the open time.

Claims

1. A method of increasing the open time and wettability of cement-based mortar comprising incorporating at least one liquid antifoam into cellulose ether to form a compound, mixing the anti-foamed cellulose ether compound into a mortar, wherein said mortar is (i) cement-based tile adhesive having increased open time and improved wetting; (ii) cement render having increased processing time; or (iii) cement-based renders in composite thermal insulation systems having increased processing time.

2. The method according to claim 1, wherein the blending step comprises either spraying the liquid antifoam onto the cellulose ether or kneading the liquid antifoam into the cellulose ether.

3. The method according to claim 2, wherein the blending step comprises kneading the liquid antifoam into the cellulose ether.

4. The method according to claim 1, wherein the cellulose ether is hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, methyl hydroxypropyl cellulose, methyl hydroxyethyl cellulose, ethyl hydroxyethyl cellulose, methyl ethyl hydroxyethyl cellulose, carboxymethyl cellulose, carboxymethyl hydroxyethyl cellulose, carboxymethyl hydroxypropyl cellulose, sulfoethyl methyl hydroxyethyl cellulose, or sulfoethyl methyl hydroxypropyl cellulose.

5. The method according to claim 4, wherein the methyl cellulose has a DS.sub.methyl of from 1.4 to 2.2; the methyl hydroxypropyl cellulose has a DS.sub.methyl of from 1.2 to 2.2 and an MS.sub.hydroxypropyl of from 0.1 to 1.0; the methyl hydroxyethyl cellulose has a DS.sub.methyl of from 1.2 to 2.2 and an MS.sub.hydroxyethyl of from 0.05 to 0.4; the hydroxyethyl cellulose has an MS.sub.hydroxyethyl Of from 1.2 to 4.0; the ethyl hydroxyethyl cellulose has a DS.sub.ethyl of from 0.5 to 1.5 and an MS.sub.hydroxyethyl of from 1.5 to 3.5; the methyl ethyl hydroxyethyl cellulose has a DS.sub.methyl of from 0.2 to 2.0, a DS.sub.ethyl of from 0.05 to 1.5 and an MS.sub.hydroxyethyl of from 0.2 to 3.5; the carboxymethyl cellulose has a DS.sub.carboxymethyl of from 0.4 to 1.0; the carboxymethyl hydroxyethyl cellulose has a DS.sub.carboxymethyl of from 0.1 to 1.0 and an MS.sub.hydroxyethyl of from 0.8 to 3.5; the carboxymethyl hydroxypropyl cellulose has a DS.sub.carboxymethyl of from 0.1 to 1.0 and an MS.sub.hydroxypropyl of from 0.8 to 3.3; the sulfoethyl methyl hydroxyethyl cellulose has a DS.sub.sulfoethyl of from 0.005 to 0.01, a DS.sub.methyl of from 0.2 to 2.0 and an MS.sub.hydroxyethyl of from 0.1 to 0.3; or the sulfoethyl methyl hydroxypropyl cellulose has a DS.sub.sulfoethyl of from 0.005 to 0.01, a DS.sub.methyl of from 0.2 to 2.0 and an MS.sub.hydroxypropyl of from 0.1 to 0.3.

6. The method according to claim 5, wherein the methyl cellulose (MC) has said DS.sub.methyl of from 1.6 to 2.0; the methyl hydroxypropyl cellulose has said DS.sub.methyl of from 1.3 to 2.0 and said MS.sub.hydroxypropyl of from 0.15 to 0.7; the methyl hydroxyethyl cellulose has said DS.sub.methyl of from 1.4 to 1.9 and said MS.sub.hydroxyethyl of from 0.1 to 0.35; and said hydroxyethyl cellulose has said MS.sub.hydroxyethyl of from 1.6 to 3.5.

7. The method according to claim 1, wherein the cellulose ether has an average degree of polymerization DPw of from 10 to 5000.

8. The method according to claim 1, wherein the cellulose ether has a viscosity of from 1 to 20 000 mPa s, measured using a Brookfield RV, 20 rpm, in water of 20 C. and 20 dH, where the viscosity is measured at different concentrations of the cellulose ether: viscosity <150 mPa s: 4.75% by weight atro; viscosity from 150 to 250 mPa s: 2.85% by weight atro; viscosity from 250 to 34 000 mPa s: 1.9% by weight atro; viscosity from 4000 to 20 000 mPa s: 1.0% by weight atro.

9. The method according to claim 8, wherein the viscosity of the cellulose ether is from 100 to 15 000 mPa s.

10. The method according to claim 1, wherein the cellulose ether has a moisture content of from 0 to 15% by weight.

11. The method according to claim 1, wherein the cellulose ether compound with liquid antifoam is present in powder form and the powder particles are smaller than 1000 m, measured using an air jet sieve.

12. The method according to claim 1, wherein the liquid antifoam is a compound based on oxyalkylene, based on silicone, alcohol, mineral oil, based on fatty acids, fatty alcohol alkoxylate and fatty acid esters or a combination thereof.

13. The method according to claim 1, wherein the liquid antifoam is a compound based on fatty alcohol alkoxylates, fatty acid esters or combinations thereof.

14. The method according to claim 1, wherein the compound additionally contains at least one nonionic, anionic or cationic polyacrylamide (PAA).

15. The method according to claim 14, wherein the polyacrylamide has a molar mass of more than 5 million and a particle size of less than 1 mm.

16. The method according to claim 1, wherein the at least one liquid antifoam is present in the compound in a proportion of from 0.5 to 15% by weight, based on the total weight of the dry compound.

17. The method according to claim 16, wherein the at least one liquid antifoam is present in the compound in a proportion of from 0.7 to 10% by weight, based on the total weight of the dry compound.

18. An anti-foamed cellulose ether compound comprising (i) cellulose ether, (ii) at least one liquid antifoam, and (iii) optional nonionic, anionic or cationic polyacrylamide, wherein the anti-foamed cellulose ether compound is in powder form and the powder particles are smaller than 1000 m, measured using an air jet sieve.

19. The anti-foamed cellulose ether according to claim 18, wherein the compound liquid antifoam is selected from fatty alcohol alkoxylates, fatty acid esters or combinations thereof.

20. A dry mortar comprising the compound of claim 18 in a proportion of from 0.02 to 1% by weight, based on the total weight of the dry mortar.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG. 1 is a photographic illustration of exemplary results from wetting testing; and

[0016] FIG. 2 is a photographic illustration of exemplary results from adhesion and pullout testing.

DETAILED DESCRIPTION OF ADVANTAGEOUS EMBODIMENTS OF THE INVENTION

[0017] It has surprisingly been found that liquid antifoams, in particular fatty acid esters and fatty alcohol alkoxylates, have a temporally limited antifoaming effect combined with good processability of the mortar. A natural biopolymer as additional constituent, as described in EP 2 966 049, is not necessary to achieve this effect. It has likewise been found that these liquid antifoams have to be incorporated into the cellulose ether. A mixture of a cellulose ether and a pulverulent antifoam (or a liquid antifoam on a solid inorganic support) surprisingly does not work. The same applies to the quaternary ammonium compounds mentioned in EP 2 190 800 B1.

[0018] The compound according to the invention of a cellulose ether with a liquid antifoam additionally improves wetting significantly and increases the open time in cement tile adhesives, renders and CTIS reinforcing renders. The adhesive pull strengths of tile adhesives after various types of storage (dry, wet, hot, freeze/thaw in accordance with ISO 13007 or EN 1348) are also significantly improved by means of the compound according to the invention.

[0019] The cellulose ether compound with liquid antifoam is produced by mixing a cellulose ether with water until it has a moisture content of 60-90%. The liquid antifoam is incorporated or kneaded into this moist cellulose ether. This dough is then dried and milled or mill-dried in one process, as is customary in the industrial production of cellulose ethers. Spraying of liquid antifoams onto the dry cellulose ether is also a possible way of incorporating the antifoam. In the context of the present invention, the term liquid refers to antifoams which have a viscosity of less than 250 mPa s, preferably less than 150 mPa s, measured using a Brookfield CAP 2000+, Spindle 01, 250 rpm, 25 C. (DIN EN ISO 321). The resulting compound according to the invention is present as free-flowing powder.

[0020] The cellulose ether can be an ionic cellulose ether such as carboxymethyl cellulose (CMC), carboxymethyl hydroxyethyl cellulose (CMHEC), carboxymethyl hydroxypropyl cellulose (CMHPC), sulfoethyl methyl hydroxyethyl cellulose (SEMHEC), sulfoethyl methyl hydroxypropyl cellulose (SEMHPC) or a nonionic cellulose ether such as hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), methyl cellulose (MC), methyl hydroxypropyl cellulose (MHPC), methyl hydroxyethyl cellulose (MHEC), ethyl hydroxyethyl cellulose (EHEC) or methyl ethyl hydroxyethyl cellulose (MEHEC).

[0021] The antifoam is a compound based on oxyalkylene, silicone oil, alcohol, mineral oil, fatty acids and fatty acid esters, with preference being given to fatty acid esters.

[0022] Preferred fields of use of the inventive cellulose ether compound with antifoam are: tile adhesives based on cement, for improving the open time and wetting, renders in composite thermal insulation systems and also cement renders (base renders, decor renders, single-coat renders) for increasing the processing time.

[0023] The proportion of cellulose ether is generally from about 80 to 99.5% by weight, preferably from about 85 to 98% by weight, particularly preferably from about 90 to 97% by weight, in each case based on the total weight of the dry compound.

[0024] The proportion of antifoam is from about 0.5 to 20% by weight, preferably from about 2 to 15% by weight, particularly preferably from about 3 to 10% by weight, in each case based on the total weight of the dry compound.

[0025] Cellulose ethers are referred to as water-soluble when at least 2 g thereof can be dissolved in one litre of cold water (20 C.).

[0026] Preferred cellulose ethers are:

[0027] Methyl cellulose (MC) having a DS.sub.methyl of from 1.4 to 2.2, in particular having a DS.sub.methyl of from 1.6 to 2.0; methyl hydroxypropyl cellulose (MHPC) having a DS.sub.methyl of from 1.2 to 2.2 and an MS.sub.hydroxypropyl Of from 0.1 to 1.0, in particular having a DS.sub.methyl of from 1.3 to 2.0 and an MS.sub.hydroxypropyl of from 0.15 to 0.7; methyl hydroxyethyl cellulose (MHEC) having a DS.sub.methyl of from 1.2 to 2.2 and an MS.sub.hydroxyethyl of from 0.05 to 0.4, in particular having a DS.sub.methyl of from 1.4 to 1.9 and an MS.sub.hydroxyethyl of from 0.1 to 0.35; hydroxyethyl cellulose (HEC) having an MS.sub.hydroxyethyl of from 1.2 to 4.0, particularly preferably having an MS.sub.hydroxyethyl of from 1.6 to 3.5; ethyl hydroxyethyl cellulose (EHEC) having a DS.sub.ethyl of from 0.5 to 1.5 and an MS.sub.hydroxyethyl of from 1.5 to 3.5 and methyl ethyl hydroxyethyl cellulose (MEHEC) having a DS.sub.methyl of from 0.2 to 2.0, a DS.sub.ethyl of from 0.05 to 1.5 and an MS.sub.hydroxyethyl of from 0.2 to 3.5, carboxymethyl cellulose ether (CMC) having a DS.sub.carboxymethyl of from 0.4 to 1.0, carboxymethyl hydroxyethyl cellulose ether (CMHEC) having a DS.sub.carboxymnethyl of from 0.1 to 1.0 and an MS.sub.hydroxyethyl of from 0.8 to 3.5, carboxymethyl hydroxypropyl cellulose ether (CMHPC) having a DS.sub.carboxymethyl of from 0.1 to 1.0 and an MS.sub.hydroxypropyl of from 0.8 to 3.3, sulfoethyl methyl hydroxyethyl cellulose ether (SEMHEC) having a DS.sub.sulfoethyl of from 0.005 to 0.01, DS.sub.methyl of from 0.2 to 2.0 and an MS.sub.hydroxyethyl of from 0.1 to 0.3, sulfoethyl methyl hydroxypropyl cellulose ether (SEMHPC) having a DS.sub.sulfoethyl of from 0.005 to 0.01, DS.sub.ethyl of from 0.2 to 2.0 and an MS.sub.hydroxypropyl of from 0.1 to 0.3.

[0028] The average degree of polymerization DPw of the cellulose ethers, measured in accordance with PulpsDetermination of Limiting Viscosity Number in Cupriethylenediamine (CED) Solutionin accordance with ISO 5351, is from about 10 to 5000.

[0029] The viscosity of the cellulose ethers is from 1 to 20 000 mPa s, preferably from 100 to 15 000 mPa s, particularly preferably from 1000 to 12 000 mPa s. It is measured using a Brookfield RV, 20 rpm, in water of 20 C. and 20 dH. Depending on the viscosity, measurements are carried out at different concentrations of the cellulose ethers: viscosity <150 mPa s: 4.75% by weight absolutely dry (atro); viscosity from 150 to 250 mPa s: 2.85% by weight atro; viscosity from 250 to 34 000 mPa s: 1.9% by weight atro; viscosity from 4000 to 20 000 mPa s: 1.0% by weight atro.

[0030] The antifoams can be based on oxyalkylene, silicone, alcohol, mineral oil, fatty acids, fatty alcohol alkoxylate and fatty acid esters. Preference is given to fatty alcohol alkoxylate and fatty acid ester antifoams, particularly those which contain a proportion of fatty acid ester, or mixtures of these constituents.

[0031] The cellulose ether/antifoam compounds of the invention do not contain any natural biopolymer, in contrast to EP 2 966 049 A1. They also do not contain any quaternary ammonium compounds as disclosed in EP 2 190 800 B1.

[0032] The following examples serve to illustrate the invention. Percentages are percentages by weight, unless indicated otherwise or obvious from the context, with atro referring to absolutely dry and lutro referring to air dry. The following components were used in the examples:

[0033] Cellulose Ethers (CE):

[0034] CE1: MHEC, DS 1.7, MS 0.2, viscosity (1.9% atro, 20 C., 20 dH, Brookfield RV 20 rpm, spindle 6) 13 000 mPa s

[0035] Fine powder (air jet sieve, <0.125 mm: 95%, <0.063 mm: 50%)

[0036] CE2: MHEC, DS 1.7, MS 0.2, viscosity (1.9% atro, 20 C., 20 dH, Brookfield RV 20 rpm, spindle 6) 25 000 mPa s

[0037] Fine powder (air jet sieve, <0.125 mm: 95%, <0.063 mm: 50%)

[0038] CE3: MHEC, DS 1.7, MS 0.2, viscosity (1.0% atro, 20 C., 20 dH, Brookfield RV 20 rpm, spindle 5) 10 000 mPa s,

[0039] Superfine powder (air jet sieve, <0.100 mm: 95%, <0.063 mm: 75%)

[0040] CE4: MHEC, DS 1.6, MS 0.3, viscosity (1.9% atro, 20 C., 20 dH, Brookfield RV 20 rpm, spindle 6) 25 000 mPa s

[0041] Fine powder (air jet sieve, <0.125 mm: 95%, <0.063 mm: 50%)

[0042] CE5: MHPC, DS 1.7, MS 0.2, viscosity (1.9% atro, 20 C., 20 dH, Brookfield RV 20 rpm, spindle 6) 25 000 mPa s

[0043] Fine powder (air jet sieve, <0.125 mm: 95%, <0.063 mm: 50%)

[0044] Starch Ethers:

[0045] SE1: Hydroxypropyl starch (HPS), MS 0.4, viscosity (5% lutro, 20 C., water with about 18 dH, Brookfield RV, 100 rpm, spindle 3) 150-300 mPa s

[0046] Modification:

[0047] The CEs used in the compound according to the invention are preferably modified CEs. The modifying agents are usually polyacrylamides (PAA). The polyacrylamides are preferably anionic PAAs having a molar mass of more than 10 million.

[0048] Antifoams:

[0049] E1: Fatty acid ester, density at 20 C.: 900 kg/m.sup.3100 kg/m.sup.3; dyn. viscosity at 25 C.: 80 mPa s30 mPa s; acid number: 35 mg KOH/g10 mg KOH/q; liquid

[0050] E2: 50% by weight of E1 on an inorganic support; powder

[0051] E3: Fatty alcohol alkoxylate, density at 20 C.: 950 kg/m.sup.350 kg/m.sup.3, viscosity at 25 C.: 115 mPa s10 mPa s; liquid

[0052] Test Products

TABLE-US-00001 TABLE 1 Compositions of the test products (parts by weight) Product No. 1 2 3 4 5 6 7 8 9 10 CE 1 CE 2 100 95 88 83 86 83 CE 3 CE 4 88 83 CE 5 88 83 PAA 12 12 12 12 12 12 12 12 E 1 5 5 2 5 5 E 2 E 3 5 Product No. 11 12 13 14 15 16 17 18 19 20 CE 1 90 88.8 98.8 93.8 CE 2 78 CE 3 97 95 87 92 CE 4 78 CE 5 PAA 10 10 3 3 1.2 1.2 12 3 3 12 E 1 1.2 2 5 5 E 2 10 10 10 E 3

[0053] Comparative Products, Commercial Products, which are Recommended for the Application

[0054] Manufacturer: Dow Chemical Company

[0055] METHOCEL 327: MHPC, modified, Brookfield viscosity 2% in water at 20 C. and 20 rpm: 22 000 mPa s, fineness <212 m: min 95%

[0056] WALOCEL MKX 45000 PF 20 L: MHEC, modified, Haake ROTOVISKO RV 100 viscosity 2% in water at 20 C. and shear rate of 2.55 l/s: 45 000 mPa s

[0057] WALOCEL Xact 13-70-E: MHEC, modified, Haake ROTOVISKO RV 100 viscosity 2% in water at 20 C. and a shear rate of 2.55 l/s: 13 000 mPa s

[0058] WALOCEL Xact 12-01-E: MHEC, unmodified, Haake ROTOVISKO RV 100 viscosity 2% in water at 20 C. and a shear rate of 2.55 l/s: 12 000 mPa s

[0059] Manufacturer: Ashland

[0060] CULMINAL MHPC 20000 S: MHPC, unmodified, Brookfield RVT viscosity abs. dry, 2% in water at 20 C. and 20 rpm: 15 000 mPa s

[0061] CULMINAL Plus 2060 PF: MHEC, modified, Brookfield RVT viscosity abs. dry, 2% in water at 20 C. and 20 rpm: 20 000 mPa s

[0062] Test Formulations

TABLE-US-00002 TABLE 2 Compositions of the test mixtures (parts by weight) Test mixture TA 1 TA 2 TA 3 TA 4 TA 5 TA 6 Cement CEM I 52.5 R 38 38 38 38 35 38 Cement CEM I 42.5 R Ground limestone 0.1 mm 5 5 5 5 10 5 Limestone sand 0.1-0.7 mm Silica sand 57 57 57 57 55 57 0.1-0.5 mm VINNAPAS 5028 E 5 5 1 CE 0.3 0.35 0.4 0.4 0.4 0.32 SE 1 0.06 0.064 Water 25 25 25 30 30 26 Test mixture TA 7 TA 8 TA 9 CTIS 1 CTIS 2 Cement CEM I 52.5 R 38 38 Cement CEM I 42.5 R 30 20 20 Ground limestone 0.1 mm 5 5 5 20 20 Limestone sand 60 60 0.1-0.7 mm Silica sand 65 57 57 0.1-0.5 mm VINNAPAS 5028 E 5 1 1.5 1.5 CE 0.35 0.4 0.32 0.15 0.15 SE 1 0.03 Water 30 27.5 26 21 23

[0063] Test Methods for Tile Adhesives

[0064] Open time was determined in accordance with ISO 13007 and DIN EN 1346.

[0065] The wetting was measured by laying a stoneware tile (55 cm) into the mortar bed (applied in accordance with ISO 13007) every 5 minutes, loading it with 2 kg for 30 seconds and then taking it from the mortar bed. The wetting of the rear side of the tile was reported in %. FIG. 1 shows how the wetting was measured.

[0066] Test Methods for CTISs

[0067] The wetting was measured by applying a mortar bed having a thickness of 0.5 cm to a plate of expanded polystyrene (EPS) and laying a glazed stoneware tile (55 cm.sup.2) with the glazed side down into the mortar bed every 5 minutes, loading it with 0.5 kg for 30 seconds and then taking it from the mortar bed. The wetting of the rear side of the tile is reported in %.

[0068] The adhesion was measured by applying a mortar bed having a thickness of 0.5 cm to an EPS plate and, after 30 minutes, laying a glazed stoneware tile (55 cm.sup.2) with the glazed side down into the mortar bed every 10 minutes and loading it with 0.5 kg for 30 seconds. After 7 days, the adhesive pull strength was determined. The adhesive pull strength in N/mm.sup.2 and the fracture appearance in % are reported. FIG. 2 shows how the adhesion and pullout are evaluated.

TABLE-US-00003 TABLE 3 Results of wetting [%] of tile adhesives with unmodified CE 2 (products No. 1 and 2) and commercial products Experiment number 2 3 1 (CULMINAL WALOCEL 4 Product No. 1 MHPC 20000 S Xact 12-01-E 2 Test mixture TA 1 TA 1 TA 1 TA 1 Wetting 5 minutes 80% 95% 100% 100% Wetting 10 minutes 45% 40% 80% 100% Wetting 15 minutes 35% 25% 40% 55% Experiment number 5 6 7 8 Product No. 1 2 1 2 Test mixture TA 2 TA 2 TA 3 TA 3 Wetting 5 minutes 75% 95% 80% 100% Wetting 10 minutes 40% 90% 40% 95% Wetting 15 minutes 35% 55% 40% 55%

[0069] The comparative product No. 1 displayed wetting of about 80% after 5 minutes, and about 40% after 1.0 minutes (Experiments No. 1, 5 and 7).

[0070] The competitive product CULMINAL MHPC 20000 S displayed wetting of 95% after 5 minutes, and about 40% after 10 minutes (Experiment No. 2) and WALOCEL Xact 12-01-E displayed wetting of 100% after 5 minutes, and 80% after 10 minutes (Experiment No. 3).

[0071] Surprisingly, the inventive product No. 2 displayed significantly greater wetting. It displayed wetting of virtually 100% after 5 minutes, and about 95% after 10 minutes (Experiments No. 4, 6 and 8).

TABLE-US-00004 TABLE 4 Results of wetting [%] of tile adhesives with modified CE 2 (products No. 3, 4, 5. 10 and 20) and commercial products Experiment number 10 11 9 METHOCEL WALOCEL Product No. 3 327 Xact 13-70-E Test mixture TA 4 TA 8 TA 4 Wetting 10 minutes 90% 90% 100% Wetting 15 minutes 85% 65% 95% Wetting 20 minutes 60% 35% 75% Experiment number 12 13 14 15 Product No. 4 5 10 20 Test mixture TA 4 TA 4 TA 4 TA 4 Wetting 10 minutes 95% 100% 95% 90% Wetting 15 minutes 90% 100% 90% 70% Wetting 20 minutes 85% 90% 85% 40%

[0072] Product No. 3 displayed wetting of 85% after 15 minutes, and 60% after 20 minutes (Experiment No. 9).

[0073] The comparative product No. 20 displayed wetting of 70% after 15 minutes, and 40% after 20 minutes (Experiment No. 15).

[0074] The commercial product METHOCEL 327 displayed wetting of 65% after 15 minutes, and 35% after 20 minutes (Experiment No. 10), and WALOCEL Xact 13-70-E displays wetting of 95% after 15 minutes, and 75% after 20 minutes (Experiment No. 11).

[0075] Surprisingly, the inventive products No. 4, No. 5 and No. 10 displayed greater wetting.

[0076] Product No. 4 displayed wetting of 90% after 15 minutes, and 85% after 20 minutes (Experiment No. 12); product No. 5 displayed wetting of 100% after 15 minutes, and 90% after 20 minutes (Experiment No. 13), and product No. 10 displayed wetting of 90% after 15 minutes, and 85% after 20 minutes (Experiment No. 14).

TABLE-US-00005 TABLE 5 Results of wetting [%] of tile adhesives with modified CE 1 (products No. 3, 4, 5, 9 and 16) Experiment number 16 17 Product No. 11 12 Test mixture TA 5 TA 5 Wetting 10 minutes 90% 90% Wetting 15 minutes 80% 90% Wetting 20 minutes 70% 80% Wetting 25 minutes 60% 80% Wetting 30 minutes 50% 70%

[0077] Product No. 11 displayed wetting of 60% after 25 minutes, and 50% after 30 minutes (Experiment No. 16).

[0078] Surprisingly, the inventive product No. 12 displayed significantly greater wetting. It displayed wetting of 80% after 25 minutes, and 70% after 30 minutes (Experiment No. 17).

TABLE-US-00006 TABLE 6 Results of wetting [%] of tile adhesives with modified CE 3 (products No. 3, 4, 5, 9 and 16) and commercial products Experiment number 19 20 CULMINAL WALOCEL 18 Plus 2060 MKX 45000 21 22 Product No. 13 PF PF 20 L 14 18 Test mixture TA 6 TA TA 9 TA 6 TA 6 Wetting 10 80% 100% 85% 100% 80% minutes Wetting 15 70% 95% 75% 100% 70% minutes Wetting 20 30% 75% 65% 90% 40% minutes Wetting 25 10% 70% 35% 85% 30% minutes

[0079] The comparative product No. 13 displayed wetting of 70% after 15 minutes, and 30% after 20 minutes (Experiment No. 18).

[0080] The comparative product No. 18 displayed wetting of 70% after 15 minutes, and 40% after 20 minutes (Experiment No. 22), comparatively the same results as comparative product No. 13.

[0081] The commercial product CULMINAL Plus 2060 PF displayed wetting of 95% after 15 minutes, and 75% after 20 minutes (Experiment No. 19), and WALOCEL MKX 45000 PF 20 L displayed wetting of 75% after 15 minutes, and 65% after 20 minutes (Experiment No. 20).

[0082] Surprisingly, the inventive product No. 14 displayed significantly greater wetting. It displayed wetting of 100% after 15 minutes, and 90% after 20 minutes (Experiment No. 21).

TABLE-US-00007 TABLE 7 Results of wetting [%] of tile adhesives with product No. 6-9 Experiment number 23 24 25 26 Product No. 6 7 8 9 Test mixture TA 4 TA 4 TA 4 TA 4 Wetting 10 minutes 95% 100% 100% 100% Wetting 15 minutes 90% 95% 90% 100% Wetting 20 minutes 70% 85% 75% 90%

[0083] The comparative product No. 6 displayed wetting of 90% after 15 minutes, and 70% after 20 minutes (Experiment No. 23).

[0084] Surprisingly, the inventive product No. 7 displayed significantly greater wetting. It displayed wetting of 95% after 15 minutes, and 85% after 20 minutes (Experiment No. 24).

[0085] The comparative product No. 8 displayed wetting of 90% after 15 minutes, and 75% after 20 minutes (Experiment No. 25).

[0086] Surprisingly, the inventive product No. 9 displayed significantly greater wetting. It displayed wetting of 100% after 15 minutes, and 90% after 20 minutes (Experiment No. 26).

TABLE-US-00008 TABLE 8 Results of the open time in accordance with EN 1346 [N/mm.sup.2] of tile adhesives with modified CE 2 (products No. 3, 4, 10 and 20) Experiment number 27 28 29 30 Product No. 3 4 10 20 Antifoam 5% E1 5% E3 10% E2 Test mixture TA 4 TA 4 TA 4 TA 4 Adhesive pull strength after 1.38 1.69 1.92 1.11 20 minutes N/mm.sup.2 N/mm.sup.2 N/mm.sup.2 N/mm.sup.2 Adhesive pull strength after 0.87 1.34 1.29 0.70 30 minutes N/mm.sup.2 N/mm.sup.2 N/mm.sup.2 N/mm.sup.2

[0087] The comparative product No. 3 displayed an adhesive pull strength of 1.38 N/mm.sup.2 after 20 minutes, and 0.87 N/mm.sup.2 after 30 minutes (Experiment No. 27).

[0088] The comparative product No. 20 displayed an adhesive pull strength of 1.11 N/mm.sup.2 after 20 minutes, and 0.70 N/mm.sup.2 after 30 minutes (Experiment No. 30).

[0089] Surprisingly, the inventive products No. 4 and No. 10 displayed greater adhesive pull strengths.

[0090] Product No. 4 gave 1.69 N/mm.sup.2 after 20 minutes, and 1.38 N/mm.sup.2 after 30 minutes (Experiment No. 28).

[0091] Product No. 10 gave 1.92 N/mm.sup.2 after 20 minutes, and 1.29 N/mm.sup.2 after 30 minutes (Experiment No. 29).

[0092] The inventive products No. 4 and No. 10 displayed greater adhesive pull strengths of 20-80%.

TABLE-US-00009 TABLE 9 Results of the open time in accordance with EN 1346 [N/mm.sup.2] of tile adhesives with modified CE 3 (products No. 13, 19 and 20) Experiment number 31 32 33 Product No. 13 19 20 Test mixture TA 6 TA 6 TA 9 Adhesive pull strength after 20 minutes 0.59 0.66 0.46 N/mm.sup.2 N/mm.sup.2 N/mm.sup.2 Adhesive pull strength after 30 minutes 0.17 0.51 0.23 N/mm.sup.2 N/mm.sup.2 N/mm.sup.2

[0093] Experiments No. 31 and 33 show that the open time was comparable to the comparative products No. 13 and No. 20 and similar adhesive pull strengths were achieved after 30 minutes, namely 0.17 N/mm.sup.2 and 0.23 N/mm.sup.2 respectively.

[0094] It was surprisingly found that the inventive product No. 19 (Experiment No. 32) displayed a significantly higher adhesive pull strength, namely 0.51 N/mm.sup.2 after 30 minutes, which is from 2 to 3 times higher than the comparative products.

TABLE-US-00010 TABLE 10 Results of wetting [%] of CTIS renders with modified CE 1 (products No. 15 and 16) Experiment number 34 35 Product No. 15 16 Test mixture CTIS1 CTIS1 Wetting 15 minutes 100% 100% Wetting 20 minutes 70% 85% Wetting 25 minutes 10% 30% Wetting 30 minutes 0% 20%

[0095] The comparative product No. 15 displayed wetting of 10% after 25 minutes, and 0% after 30 minutes (Experiment No. 34).

[0096] Surprisingly, the inventive product No. 16 displayed significantly greater wetting. It displayed wetting of 30% after 25 minutes, and 20% after 30 minutes (Experiment No. 35).

TABLE-US-00011 TABLE 11 Results of wetting [%] of CTIS renders with modified CE 3 (products No. 13 and 19) Experiment number 36 37 Product No. 13 19 Test mixture CTIS2 CTIS2 Wetting 20 minutes 100% 100% Wetting 25 minutes 90% 100% Wetting 30 minutes 50% 100%

[0097] The comparative product No. 13 displayed wetting of 90% after 25 minutes, and 50% after 30 minutes (Experiment No. 36).

[0098] Surprisingly, the inventive product No. 19 displayed significantly greater wetting. It displayed wetting of 100% after 25 minutes, and likewise 100% after 30 minutes (Experiment No. 37).

TABLE-US-00012 TABLE 12 Results of the adhesive pull strength [N/mm.sup.2] of CTIS renders with modified CE 3 (products No. 13 und 19) Experiment number 38 39 Cellulose ether 13 19 Test mixture CTIS2 CTIS2 after 30 minutes 0.12 N/mm.sup.2 0.09 N/mm.sup.2 100% EPS pullout 100% EPS pullout after 40 minutes 0.06 N/mm.sup.2 0.11 N/mm.sup.2 0% EPS pullout 100% EPS pullout after 50 minutes 0 N/mm.sup.2 0.09 N/mm.sup.2 0% EPS pullout 100% EPS pullout

[0099] The comparative product No. 13 displayed an adhesive pull strength of 0.06 N/mm.sup.2 and 0% EPS pullout after 40 minutes, and no adhesive pull strength and no EPS pullout after 50 minutes (Experiment No. 38).

[0100] The inventive product No. 19 displayed an adhesive pull strength of 0.11 N/mm.sup.2 and 100% EPS pullout after 40 minutes, and an adhesive pull strength of 0.09 N/mm.sup.2 and 100% EPS pullout after 50 minutes (Experiment No. 39). It was processable for a significantly longer time.