Sticking removing painting compsns. having addhesive for affecting viscosity removal

A technology of composition and additives, applied in the direction of coatings, devices for coating liquids on surfaces, special surfaces, etc., can solve problems such as not very feasible, slow, and increased adhesion to substrates

Inactive Publication Date: 2007-12-26
TH GOLDSCHMIDT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0061] 2. As the proportion of monocarboxylic acid ester groups without polymerizable double bonds increases, the debonding performance decreases and the adhesion to the substrate increases
Admittedly, these reactions can be performed, however, they are not very feasible from a reaction technol

Method used

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  • Sticking removing painting compsns. having addhesive for affecting viscosity removal
  • Sticking removing painting compsns. having addhesive for affecting viscosity removal
  • Sticking removing painting compsns. having addhesive for affecting viscosity removal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0175] A 50% toluene solution (165 g) of a commercially available MQ resin with an average molecular weight of 2442 g / mol, an M / Q ratio of 0.67 and a SiOH content of 1.5% (165 g) and 14.9 g (0.018 mole) of acryloyloxypropyl ( acryloxypropyl) multifunctional polydimethylsiloxane is mixed under stirring in a 500ml three-necked flask, and a stirrer, a thermometer and a reflux condenser are equipped in the flask, and the polydimethylsiloxane is passed through Synthesized as described in Example 1 of German Patent 3810140 and has the following average structural formula

[0176] CH 2 =CHCOOCH 2 CH 2 CH 2 Me 2 SiO(SiMe 2 O) 6.2 SiMe 2 CH 2 CH 2 CH 2 OOCCH=CH 2

[0177] Afterwards, air was removed from the reaction flask by bubbling nitrogen. Under a nitrogen blanket and with stirring, 0.54 g (0.3% by weight) of trifluoromethanesulfonic acid was added. Next, the temperature was raised to 90° C. within 30 minutes, and stirring was continued at this temperature for a furt...

Embodiment 2

[0181] 95.2 g of a 60% toluene solution of a commercially available MQ resin with an average molecular weight of 1133 g / mol, an M / Q ratio of 0.75 and a SiOH content of 1.4%, 27.1 g (0.075 moles) of 1,3-bis-(3-acryloyloxy propyl)-tetramethyldisiloxane (synthesized by esterification of 1,3-bis(3-hydroxypropyl)-tetramethyldisiloxane (ABCR) with acryloyl chloride in benzene / pyridine ) and 0.25 g (0.3% by weight) of trifluoromethanesulfonic acid were heated to 95° C. and stirred at this temperature for 6 hours. Thereafter, the reaction solution was cooled to 50° C., neutralized with 2% by weight of sodium carbonate as described in Example 1, and then filtered. The filtrate was concentrated in a rotary evaporator, then vacuum distilled (80°C, 2 torr). The reaction product, hereinafter referred to as CRA-2, was a homogeneous yellow substance with a viscosity of 24, 300 mPas (20° C.), which was dissolved in toluene to form a clear solution.

[0182] Gel permeation chromatography (GP...

example 3

[0184] Polydimethylsiloxane (23.7 g, 0.01 mole) having a part of the side end acryloxypropyl functionalized polydimethylsiloxane (23.7 g, 0.01 moles)

[0185] Me 3 SiO(SiMe 2 O) 16.2 (CH 2 =CHCOOCH 2 CH 2 CH 2 SiMeO) 7.8 SiMe 3 With 245 g of a commercially available MQ tree (average molecular weight: 2067 g / mol, M / Q ratio: 0.71; and SiOH content: 0.25%) in 50% xylene solution and 0.78 g (0.3% by weight) of trifluoromethanesulfonic acid Stir at 100°C for 6 hours under nitrogen atmosphere. When the reaction mixture was cooling, 2% by weight of sodium carbonate was added and the mixture was stirred until no traces of acid could be detected. After filtration, volatile components were removed by distillation at 80°C and 2 torr. A homogeneous resinous product (146 g) was obtained which 1 H. 13 C and 29 SiNMR spectroscopic analysis has dimethylsiloxy and (acryloxypropyl)methylsiloxy units, as well as M and Q units.

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Abstract

This invention discloses a debonding coating composition based on organopolysiloxane containing (meth) acrylate groups that can be cured by radiation. The debonding coating composition comprises an additive that can influence the debonding degree. The additive is obtained by reacting MQ resin and organopolysiloxane containing (meth) acrylate groups.

Description

technical field [0001] The present invention relates to an abhesive coating composition comprising one or more radiation-curable organopolysiloxanes bearing (meth)acrylate groups, an abhesive-influencing Additives and optional photoinitiators and conventional fillers. Background technique [0002] According to the prior art, additives affecting deviscosity refer to controlled release agents or controlled release additives. The corresponding abbreviation is CRA. For convenience, the abbreviation CRA is used in this specification. [0003] Debonding coating compositions are used on a large scale for coating, especially 2-dimensional materials, to reduce the tendency of products to stick to these surfaces. The debonding coating composition is used, for example, to coat paper, film or sheet used as a backing for pressure-sensitive labels. The label with the pressure sensitive adhesive still adheres to the coated surface to a sufficient extent that the sheet with the pressure...

Claims

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Application Information

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IPC IPC(8): C08L83/07C09D5/20B05D5/08
Inventor D・韦沃斯P・莱尔施T・埃布雷克特
Owner TH GOLDSCHMIDT AG
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