Primer solution for improving the adhesion of adhesive strips on hydrophilic surfaces in moist and wet conditions

Abstract

The invention relates to a solution in particular for the pre-treatment of a surface, containing, preferably consisting of: I) at least one first silane of formula (I) with R.sup.1, R.sup.2, R.sup.3 independently selected from the groups methyl, ethyl, 2 methoxyethyl, propyl, i-propyl, butyl, benzyl, wherein m=0 or 1, n=3 to 12, p=1 or 2, and for p=1, Y=a functional group selected from the groups (meth)acryl, (meth)acryloxy, mercapto, ureido, —NH—CH.sub.2—CH.sub.2—NR.sup.4R.sup.5, —NR.sup.4R.sup.5 (with R.sup.4 and R.sup.5 independently selected from the groups H, alkyl, phenyl, benzyl, cycloalkyl), or for p=2, Y=NH; II) at least one second silane of formula (II) with R.sup.1, R.sup.2, R.sup.3 independently selected from the groups methyl, ethyl, 2 methoxyethyl, propyl, i-propyl, butyl, benzyl, wherein m=0 or 1, R.sup.8=H, alkyl, phenyl, benzyl or cycloalkyl; III) at least one alcohol; and IV) water. ##STR00001##

Claims

1. A solution comprising: a hydrolysate of a first silane selected from the group consisting of a hydrolysate of 3-aminopropyltrimethoxysilane and a hydrolysate of 3-aminopropyltriethoxysilane; a hydrolysate of a second silane selected from the group consisting of a hydrolysate of vinyltrimethoxysilane and a hydrolysate of vinyltriethoxysilane; isopropanol; and water, wherein: the solution comprises no hydrolysates of silanes in addition to the hydrolysate of the first silane and the hydrolysate of the second silane; the hydrolysate of the first silane and the hydrolysate of the second silane are present in a total concentration of 0.1 to 1 percent by weight of the solution; the hydrolysate of the second silane is present at a 2.0- to 6.0-fold weight concentration compared to the hydrolysate of the first silane; and the water is present at greater than 5.0 percent but less than 30.0 percent by weight of the solution.

2. The solution as claimed in claim 1, wherein the isopropanol is present at 72 to 94.94 percent by weight of the solution.

3. The solution as claimed in claim 1, wherein the water is distilled or fully-demineralized water.

4. The solution as claimed in claim 1, wherein the solution has been dispensed into a pump spray or an aerosol.

5. The solution as claimed in claim 1, wherein the solution has been dispensed into a sealed-edge pouch comprising a nonwoven web, a woven fabric, or a sponge.

6. The solution as claimed in claim 1, wherein: the solution has been dispensed into a container comprising a reservoir and an applicator; and the solution is capable of being applied contactlessly.

7. The solution as claimed in claim 1, wherein the solution is located in a pack into which a nonwoven web, a woven fabric, or a sponge is integrated such that the nonwoven web, the woven fabric, or the sponge is located on a free surface of the pack, the solution being: separated from the nonwoven web, the woven fabric, or the sponge by a severable membrane, or surrounded by an envelope and thus separated from the nonwoven web, the woven fabric, or the sponge.

8. A method comprising applying the solution as claimed in claim 1 to a hydrophilic surface.

9. A method comprising: applying the solution as claimed in claim 1 to a hydrophilic surface; and bonding a sheet of an adhesive to the hydrophilic surface, wherein: the hydrophilic surface can be repartitioned without damage; the sheet of an adhesive comprises an adhesive based on polymers and/or copolymers of synthetic rubber and/or natural rubber; the hydrophilic surface comprises a bond plane having a direction; and the repartitioning without damage can be accomplished by pulling in the direction of the bond plane.

10. A kit comprising a solution as claimed in claim 1 and an adhesive sheet, wherein: the adhesive sheet can be repartitioned without damage; the adhesive is based on polymers and/or copolymers of synthetic rubber and/or natural rubber; the adhesive sheet comprises a bond plane having a direction; and the repartitioning without damage can be accomplished by pulling in the direction of the bond plane.

11. The solution as claimed in claim 1, consisting of the hydrolysate of the first silane, the hydrolysate of the second silane, the isopropanol, and the water.

12. The solution as claimed in claim 1, wherein the water is present at greater than 6 percent but less than 20 percent by weight of the solution.

13. The solution as claimed in claim 1, wherein the water is present at greater than 7 percent but less than 10 percent by weight of the solution.

14. The solution as claimed in claim 1, which exhibits the following property: after pretreating a damp surface by applying the solution to said damp surface, a repartable adhesive strip adheres to a damp surface as a result of the pretreating for a longer period of time than if the damp surface had not been subjected to said pretreating.

15. A solution consisting of: a hydrolysate of a first silane selected from the group consisting of a hydrolysate of 3-aminopropyltrimethoxysilane and a hydrolysate of 3-aminopropyltriethoxysilane; a hydrolysate of a second silane selected from the group consisting of a hydrolysate of vinyltrimethoxysilane and a hydrolysate of vinyltriethoxysilane; isopropanol; and water, wherein: the hydrolysate of the first silane and the hydrolysate of the second silane are present in a total concentration of 0.05 to 5 percent by weight of the solution and the hydrolysate of the second silane is present at a 3.0- to 6.0-fold weight concentration compared to the hydrolysate of the first silane.

Description

EXAMPLES

(1) The test methods below were used to provide brief characterization of the primer solutions produced in accordance with the invention.

(2) The measurements are carried out, unless otherwise indicated, under test conditions of 23±1° C. and 50±5% relative atmospheric humidity.

Test Methods

(3) To investigate the solutions, they were each briefly coated onto a ceramic tile with smooth glazing, using a nonwoven web soaked with the respective solution (designation of the web used: EVO 80, composition: polyester/polyamide 6, 70/30, from Freudenberg). After a waiting time of 10 minutes, in which the solvent evaporated, two different adhesive tapes were adhered to the tiles pretreated in this way.

(4) First, a double-sided acrylate tab, Tesa® 4952 (a double-sided adhesive tape with a foam carrier and an aging-resistant acrylate adhesive having a thickness of 1.2 mm and a peel adhesion on steel of 14 N/25 mm) was used, and secondly Powerstrips® Large from tesa (double-sidedly adhering, carrier-less diecuts, in individual sealed enclosures, with an adhesive based on synthetic rubber with a thickness of 0.65 mm and a peel adhesion on steel of 74.0 N/25 mm), as can be found in the examples in DE 100 55 942 A1.

(5) The latter strips are also comprehensively described in DE 33 31 016 C2, DE 42 22 849 A1, DE 42 33 872 A1, DE 44 31 914 A1, DE 195 37 323 A1, DE 197 08 364 A1, DE 197 29 706 and DE 100 33 399 A1.

(6) The bond areas in both cases were 3.8 cm×2.0 cm. Three individual bonds were made in each case.

(7) A cleaned steel baseplate, provided centrally in the middle with a screw hole, was adhered to the bonding agents using a pressure of 100 N lasting for 10 seconds. A metal rod 3 mm in width was screwed into the screw hole, and therefore projected vertically from the steel baseplate. This rod had notches, allowing weights to be mounted at a defined distance from the steel plate. The tiles were brought immediately thereafter into a chamber held under constant conditions, with a temperature of 35° C. and a relative atmospheric humidity of 85%, where they were affixed perpendicularly, and a weight of 200 g in the case of the acrylate tab and 1 kg in the case of the Powerstrip was suspended, at a distance of 50 mm, from the rod, which was hence now projecting horizontally.

(8) The weight was suspended: a) immediately after the perpendicular affixing of the tile (not more than 3 minutes after the bonding of the steel baseplate) b) 15 minutes after the perpendicular affixing of the tile c) 30 minutes after the perpendicular affixing of the tile.

(9) After a subsequent waiting time of 10 minutes, water (2 ml) was trickled at the top onto the edge of the bonded joint. This wetting was repeated every 24 hours. A measurement was made of the time in hours before the rod fell from the wall. For the purpose of comparison, rods without adhesion promoter were suspended.

(10) These experiments were carried out with fresh specimens and stored specimens. The specimens were in one case introduced into well-sealed 500 ml screw-top glasses (in each case about 350 ml of primer solution per glass), and in another instance were welded into sealed-edge pouches (sachets) having a three-ply polyester/aluminum/polyethylene construction. Likewise welded into each of the sachets was a folded-up nonwoven web (EVO 80) with an area of 6 cm×12 cm. Each sachet held about 0.85 ml of primer solution.

(11) The stored specimens were also assessed visually. This was done to determine whether the solutions were clear or whether there was clouding or a white precipitate.

(12) The investigations and assessments were made after the following storage times: Fresh (after not more than three days of storage at room temperature (23° C.)) After 12 months at room temperature (23° C.) After 12 months at 40° C. After 12 months at 55° C.

(13) The results are apparent from the tables subsequent to the individual examples.

(14) Production of the Primer Solutions

(15) The primer solutions of the invention and also the comparative specimens were produced using the following silanes:

(16) TABLE-US-00002 Manufacturer Silane Trade name CAS No. or supplier 3-Aminopropyltrimethoxysilane 13822-56-5 Sigma-Aldrich 3-Aminopropyltriethoxysilane Dynasylan 919-30-2 Evonik AMEO ® N-2-Aminoethyl-3-amino- Dynasylan 1760-24-3 Evonik propyltrimethoxysilane DAMO ® Bis[3-triethoxysilyl)propyl]amine Dynasylan 13497-18-2 Evonik 1122 ® 3-Methacryloyloxypropyltrimethoxysilane Dynasylan 2530-85-0 Evonik MEMO ® Vinyltrimethoxysilane Dynasylan 2768-02-7 Evonik VTMO ® Vinyltriethoxysilane Dynasylan 78-08-0 Evonik VTEO ® Tetraethoxysilane Dynasylan A ® 78-10-4 Evonik

(17) Additionally, the following solvents were used:

(18) TABLE-US-00003 Manufacturer Solvent CAS No. or supplier Ethanol 64-17-5 Sigma-Aldrich Isopropanol 67-63-0 Sigma-Aldrich n-Butanol 71-36-3 Sigma-Aldrich Butyl acetate 123-86-4 Sigma-Aldrich Water, fully demineralized 7732-18-5 CSC Jäklechemie

(19) The silanes/solvents indicated in the examples were mixed with a laboratory stirring mechanism from IKA® using a propeller stirrer, as follows: where two or more solvents were used, they were first mixed homogeneously for 15 minutes. Then the silanes were added. Where two or more silanes were used, this addition took place in successive individual steps. In other words, first of all the first of the silanes listed in the examples below was added and mixed in. Only after the first silane had been mixed in was the second silane added and likewise mixed in, and so on. The process of mixing in took place for each silane by 15 minutes of stirring at moderate stirring velocity. For each of the solutions, 350 ml were produced and were dispensed into 500 ml screw-top glasses. 0.85 ml was placed into a respective sachet, and welded into the sachet together with the nonwoven web.

Inventive Example 1

(20) Composition of the Primer Solution:

(21) TABLE-US-00004 Raw material Weight percent Isopropanol 90.0 Water, fully demineralized 9.4 Dynasylan AMEO ® 0.3 Dynasylan VTMO ® 0.3
Results:

(22) TABLE-US-00005 Visual assessment Time before the weight Holding time Storage time of solution was suspended Adhesive tape (hours) Fresh Clear Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab 20 Powerstrip 16 30 minutes Acrylate tab 400 Powerstrip 350 12 months 23° C. Clear Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab 18 Powerstrip 14 30 minutes Acrylate tab 450 Powerstrip 400 12 months 40° C. Clear Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab 24 Powerstrip 20 30 minutes Acrylate tab 400 Powerstrip 380 12 months 55° C. Clear Immediate Acrylate tab n.d. Powerstrip <1 15 minutes Acrylate tab n.d. Powerstrip 20 30 minutes Acrylate tab n.d. Powerstrip 320 n.d. = not determined

Inventive Example 2

(23) Composition of the Primer Solution:

(24) TABLE-US-00006 Raw material Weight percent Isopropanol 90.0 Water, fully demineralized 9.2 Dynasylan AMEO ® 0.6 Dynasylan VTMO ® 0.2
Results:

(25) TABLE-US-00007 Visual assessment Time before the weight Holding time Storage time of solution was suspended Adhesive tape (hours) Fresh Clear Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab 10 Powerstrip 13 30 minutes Acrylate tab 200 Powerstrip 300 12 months 23° C. Clear Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab 14 Powerstrip 10 30 minutes Acrylate tab 200 Powerstrip 350 12 months 40° C. Clear Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab 20 Powerstrip 22 30 minutes Acrylate tab 300 Powerstrip 320 12 months 55° C. Clear Immediate Acrylate tab n.d. Powerstrip <1 15 minutes Acrylate tab n.d. Powerstrip 15 30 minutes Acrylate tab n.d. Powerstrip 200 n.d. = not determined

Inventive Example 3

(26) Composition of the Primer Solution:

(27) TABLE-US-00008 Raw material Weight percent Isopropanol 90.0 Water, fully demineralized 9.2 Dynasylan AMEO ® 0.2 Dynasylan VTMO ® 0.55 Dynasylan A ® 0.05
Results:

(28) TABLE-US-00009 Visual assessment Time before the weight Holding time Storage time of solution was suspended Adhesive tape (hours) Fresh Clear Immediate Acrylate tab 10 Powerstrip 15 15 minutes Acrylate tab 100 Powerstrip 150 30 minutes Acrylate tab 400 Powerstrip 450 12 months 23° C. Clear Immediate Acrylate tab 20 Powerstrip 30 15 minutes Acrylate tab 18 Powerstrip 14 30 minutes Acrylate tab 450 Powerstrip 400 12 months 40° C. Clear Immediate Acrylate tab 10 Powerstrip 12 15 minutes Acrylate tab 24 Powerstrip 20 30 minutes Acrylate tab 400 Powerstrip 380 12 months 55° C. Cloudy Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab 10 Powerstrip 10 30 minutes Acrylate tab 80 Powerstrip 100

Inventive Example 4

(29) Composition of the Primer Solution:

(30) TABLE-US-00010 Raw material Weight percent Isopropanol 84.6 Water, fully demineralized 9.4 Dynasylan AMEO ® 2.0 Dynasylan VTMO ® 4.0
Results:

(31) TABLE-US-00011 Visual Time before Holding assessment the weight was Adhesive time Storage time of solution suspended tape (hours) Fresh Clear Immediate Acrylate tab 1 Powerstrip 1 15 minutes Acrylate tab 70 Powerstrip 90 30 minutes Acrylate tab 300 Powerstrip 410 12 months 23° C. Clear Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab 60 Powerstrip 80 30 minutes Acrylate tab 300 Powerstrip 320 12 months 40° C. Clear Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab 30 Powerstrip 20 30 minutes Acrylate tab 200 Powerstrip 300 12 months 55° C. Cloudy Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab <1 Powerstrip <1 30 minutes Acrylate tab 30 Powerstrip 150

Inventive Example 5

(32) Composition of the Primer Solution:

(33) TABLE-US-00012 Raw material Weight percent Ethanol 90.0 Water, fully demineralized 9.2 Dynasylan AMEO ® 0.2 Dynasylan VTMO ® 0.6
Results:

(34) TABLE-US-00013 Visual Time before Holding assessment the weight was Adhesive time Storage time of solution suspended tape (hours) Fresh Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 23° C. Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 40° C. Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 55° C. Clear Immediate Acrylate tab 250 Powerstrip 300 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500

Inventive Example 6

(35) Composition of the Primer Solution:

(36) TABLE-US-00014 Raw material Weight percent n-Butanol 90.0 Water, fully demineralized 9.2 Dynasylan AMEO ® 0.2 Dynasylan VTMO ® 0.6
Results:

(37) TABLE-US-00015 Visual Time before Holding assessment the weight was Adhesive time Storage time of solution suspended tape (hours) Fresh Clear Immediate Acrylate tab 200 Powerstrip 300 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 23° C. Clear Immediate Acrylate tab 220 Powerstrip 300 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 40° C. Clear Immediate Acrylate tab 100 Powerstrip 300 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 55° C. Clear Immediate Acrylate tab 100 Powerstrip 150 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500

Inventive Example 7

(38) Composition of the Primer Solution:

(39) TABLE-US-00016 Raw material Weight percent Isopropanol 90.0 Water, fully demineralized 9.2 Dynasylan AMEO ® 0.2 Dynasylan VTMO ® 0.6
Results:

(40) TABLE-US-00017 Visual Time before Holding assessment the weight was Adhesive time Storage time of solution suspended tape (hours) Fresh Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 23° C. Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 40° C. Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 55° C. Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500

Inventive Example 8

(41) Composition of the Primer Solution:

(42) TABLE-US-00018 Raw material Weight percent Isopropanol 90.0 Water, fully demineralized 9.2 3-Aminopropyltrimethoxysilane 0.2 Dynasylan VTMO ® 0.6
Results:

(43) TABLE-US-00019 Visual Time before Holding assessment the weight was Adhesive time Storage time of solution suspended tape (hours) Fresh Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 23° C. Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 40° C. Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 55° C. Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500

Inventive Example 9

(44) Composition of the Primer Solution:

(45) TABLE-US-00020 Raw material Weight percent Isopropanol 69.2 Water, fully demineralized 30.0 Dynasylan AMEO ® 0.2 Dynasylan VTMO ® 0.6
Results:

(46) TABLE-US-00021 Visual Time before Holding assessment the weight was Adhesive time Storage time of solution suspended tape (hours) Fresh Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 23° C. Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 40° C. Clear Immediate Acrylate tab 50 Powerstrip 80 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 55° C. Cloudy Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab 100 Powerstrip 150 30 minutes Acrylate tab 200 Powerstrip >500

Inventive Example 10

(47) Composition of the Primer Solution:

(48) TABLE-US-00022 Raw material Weight percent Isopropanol 90.0 Water, fully demineralized 9.2 Dynasylan DAMO ® 0.2 Dynasylan VTMO ® 0.6
Results:

(49) TABLE-US-00023 Visual Time before Holding assessment the weight was Adhesive time Storage time of solution suspended tape (hours) Fresh Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 23° C. Clear Immediate Acrylate tab 400 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 40° C. Clear Immediate Acrylate tab 300 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 55° C. Clear Immediate Acrylate tab 200 Powerstrip 300 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500

Inventive Example 11

(50) Composition of the Primer Solution:

(51) TABLE-US-00024 Raw material Weight percent Isopropanol 90.0 Water, fully demineralized 9.2 Dynasylan 1122 ® 0.2 Dynasylan VTMO ® 0.6
Results:

(52) TABLE-US-00025 Time before the Visual weight Holding Storage assessment was Adhesive time time of solution suspended tape (hours) Fresh Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 23° C. Clear Immediate Acrylate tab 400 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 40° C. Clear Immediate Acrylate tab 300 Powerstrip 400 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 55° C. Clear Immediate Acrylate tab 300 Powerstrip 300 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500

Inventive Example 12

(53) Composition of the Primer Solution:

(54) TABLE-US-00026 Raw material Weight percent Isopropanol 90.0 Water, fully demineralized 9.2 Dynasylan MEMO ® 0.2 Dynasylan VTMO ® 0.6
Results:

(55) TABLE-US-00027 Time before Visual the assessment weight Holding Storage of was Adhesive time time solution suspended tape (hours) Fresh Clear Immediate Acrylate tab 400 Powerstrip 300 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 23° C. Clear Immediate Acrylate tab 300 Powerstrip 400 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 40° C. Clear Immediate Acrylate tab 100 Powerstrip 100 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 55° C. Clear Immediate Acrylate tab 100 Powerstrip 50 15 minutes Acrylate tab 300 Powerstrip 300 30 minutes Acrylate tab >500 Powerstrip >500

Inventive Example 13

(56) Composition of the Primer Solution:

(57) TABLE-US-00028 Raw material Weight percent Isopropanol 90.0 Water, fully demineralized 9.2 Dynasylan AMEO ® 0.2 Dynasylan VTEO ® 0.6
Results:

(58) TABLE-US-00029 Time before Visual the assessment weight Holding Storage of was Adhesive time time solution suspended tape (hours) Fresh Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 23° C. Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 40° C. Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500 12 months 55° C. Clear Immediate Acrylate tab >500 Powerstrip >500 15 minutes Acrylate tab >500 Powerstrip >500 30 minutes Acrylate tab >500 Powerstrip >500

Comparative Example 1

(59) Composition of the Comparative Specimen:

(60) TABLE-US-00030 Raw material Weight percent Isopropanol 90.0 Water, fully demineralized 9.2 Dynasylan AMEO ® 0.8
Results:

(61) TABLE-US-00031 Time before Visual the assessment weight Holding Storage of was Adhesive time time solution suspended tape (hours) Fresh Clear Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab <1 Powerstrip <1 30 minutes Acrylate tab 20 Powerstrip 10 12 months 23° C. Clear Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab <1 Powerstrip <1 30 minutes Acrylate tab 10 Powerstrip 5 12 months 40° C. Clear Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab <1 Powerstrip 3 30 minutes Acrylate tab 2 Powerstrip <1 12 months 55° C. Clear Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab <1 Powerstrip <1 30 minutes Acrylate tab <1 Powerstrip <1

Comparative Example 2

(62) Composition of the Comparative Specimen:

(63) TABLE-US-00032 Raw material Weight percent Isopropanol 90.0 Water, fully demineralized 9.2 Dynasylan VTMO ® 0.8
Results:

(64) TABLE-US-00033 Time before Visual the assessment weight Holding Storage of was Adhesive time time solution suspended tape (hours) Fresh Clear Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab <1 Powerstrip <1 30 minutes Acrylate tab 5 Powerstrip 5 12 months 23° C. Clear Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab <1 Powerstrip <1 30 minutes Acrylate tab 5 Powerstrip 5 12 months 40° C. Clear Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab <1 Powerstrip <1 30 minutes Acrylate tab <1 Powerstrip <1 12 months 55° C. Clear Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab 2 Powerstrip 2 30 minutes Acrylate tab <1 Powerstrip <1

Comparative Example 3

(65) Composition of the Comparative Specimen:

(66) TABLE-US-00034 Raw material Weight percent Butyl acetate 90.0 Water, fully demineralized 9.2 Dynasylan AMEO ® 0.2 Dynasylan VTMO ® 0.6
Results:

(67) TABLE-US-00035 Time before Visual the assessment weight Holding Storage of was Adhesive time time solution suspended tape (hours) Fresh Precipitate Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab <1 Powerstrip <1 30 minutes Acrylate tab <1 Powerstrip <1 12 months 23° C. Precipitate Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab <1 Powerstrip <1 30 minutes Acrylate tab <1 Powerstrip <1 12 months 40° C. Precipitate Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab <1 Powerstrip <1 30 minutes Acrylate tab <1 Powerstrip <1 12 months 55° C. Precipitate Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab <1 Powerstrip <1 30 minutes Acrylate tab <1 Powerstrip <1

Comparative Example 4

(68) Composition of the Comparative Specimen:

(69) TABLE-US-00036 Raw material Weight percent Isopropanol 99.2 Dynasylan AMEO ® 0.2 Dynasylan VTMO ® 0.6
Results:

(70) TABLE-US-00037 Time before Visual the assessment weight Holding Storage of was Adhesive time time solution suspended tape (hours) Fresh Clear Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab 5 Powerstrip 5 30 minutes Acrylate tab 10 Powerstrip 10 12 months 23° C. Clear Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab 5 Powerstrip 5 30 minutes Acrylate tab 8 Powerstrip 10 12 months 40° C. Cloudy Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab <1 Powerstrip <1 30 minutes Acrylate tab <1 Powerstrip <1 12 months 55° C. Cloudy Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab <1 Powerstrip <1 30 minutes Acrylate tab <1 Powerstrip <1

Comparative Example 5

(71) Composition of the Comparative Specimen:

(72) TABLE-US-00038 Solvent, silane Weight percent Water, fully demineralized 99.2 Dynasylan AMEO ® 0.2 Dynasylan VTMO ® 0.6
Results:

(73) TABLE-US-00039 Time before Visual the assessment weight Holding Storage of was Adhesive time time solution suspended tape (hours) Fresh Precipitate Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab <1 Powerstrip <1 30 minutes Acrylate tab <1 Powerstrip <1 12 months 23° C. Precipitate Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab <1 Powerstrip <1 30 minutes Acrylate tab <1 Powerstrip <1 12 months 40° C. Precipitate Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab <1 Powerstrip <1 30 minutes Acrylate tab <1 Powerstrip <1 12 months 55° C. Precipitate Immediate Acrylate tab <1 Powerstrip <1 15 minutes Acrylate tab <1 Powerstrip <1 30 minutes Acrylate tab <1 Powerstrip <1

(74) All of the experiments were carried out both with the solutions stored in the screw-top glasses and with the solutions from the sachets. The results were identical in each case. Comparative experiments without adhesion promoters gave holding times of not more than 1 hour in the case of the acrylate tab and less than 1 hour in the case of the Powerstrip.