Addition-curable organopolysiloxane composition, release paper and release film

Patent metadata

Field	Value
Publication number	US-12577429-B2
Application number	US-202118001319-A
Country	US
Kind code	B2
Filing date	Jun 3, 2021
Priority date	Jun 12, 2020
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

One of the purposes of the present invention is to provide an addition-curable organopolysiloxane composition which cures sufficiently with a minor amount of platinum group metal catalyst to exert satisfactory adhesion and provides a cured film having a release force comparable to the prior art cured film, and to provide an addition-curable organopolysiloxane composition which allows the sufficient progress of addition cure even on a substrate comprising a catalyst poison component so as to be suitable for providing a release coating for silicone rubber and release paper or release film. That is, the present invention provides an addition-curable organopolysiloxane composition comprising components (A) to (C): (A) an organopolysiloxane having two or more alkenyl groups each bonded to a silicon atom per molecule and having 0.01 to 2.9, as an average, (meth)acrylic groups, (B) an organohydrogenpolysiloxane having two or more hydrogen atoms each bonded to a silicon atom per molecule in such an amount that a ratio of the number of Si—H groups in component (B) to the number of alkenyl groups in component (A) is 1 to 5, and (C) a platinum group metal catalyst in an amount that a platinum group metal amount is 1 to 100 ppm by mass based on a total mass of the composition.

First claim

The invention claimed is:

1 . An addition-curable organopolysiloxane composition comprising the following components (A) to (C):
(A) an organopolysiloxane having two or more alkenyl groups each bonded to a silicon atom per molecule and having 0.01 to 1.0, as an average, (meth) acrylic groups, (B) an organohydrogenpolysiloxane having two or more hydrogen atoms each bonded to a silicon atom (i.e., Si—H group) per molecule in such an amount that a ratio of the number of Si-H groups in component (B) to the number of alkenyl groups in component (A) is 1 to 5, and (C) a platinum group metal catalyst in an amount that a platinum group metal amount is 1 to 100 ppm by mass based on a total mass of the composition.

2 . The addition-curable organopolysiloxane composition according to claim 1 , further comprising 0.01 to 5 parts by mass of (D) a reaction inhibitor, relative to 100 parts by mass of component (A).

3 . The addition-curable organopolysiloxane composition according to claim 1 , wherein component (A) has a weight average molecular weight of 3,000 to 300,000.

4 . The addition-curable organopolysiloxane composition according to claim 1 , wherein component (A) has the (meth) acrylic group on a side chain.

5 . The addition-curable organopolysiloxane composition according to claim 1 , wherein the amount of component (C) is an amount that a platinum group metal amount is 5 to 40 ppm by mass, based on the total mass of the composition.

6 . The addition-curable organopolysiloxane composition according to claim 1 , the addition-curable organopolysiloxane composition being for release paper or release film.

7 . A release paper having a cured film consisting of a cured product of the addition-curable organopolysiloxane composition according to claim 1 .

8 . A release film having a cured film consisting of a cured product of the addition-curable organopolysiloxane composition according to claim 1 .

9 . The addition-curable organopolysiloxane composition according to claim 2 , wherein component (A) has a weight average molecular weight of 3,000 to 300,000.

10 . The addition-curable organopolysiloxane composition according to claim 2 , wherein component (A) has the (meth) acrylic group on a side chain.

11 . The addition-curable organopolysiloxane composition according to claim 2 , wherein the amount of component (C) is an amount that a platinum group metal amount is 5 to 40 ppm by mass, based on the total mass of the composition.

12 . A release paper having a cured film consisting of a cured product of the addition-curable organopolysiloxane composition according to claim 2 .

13 . A release paper having a cured film consisting of a cured product of the addition-curable organopolysiloxane composition according to claim 3 .

14 . A release paper having a cured film consisting of a cured product of the addition-curable organopolysiloxane composition according to claim 4 .

15 . A release paper having a cured film consisting of a cured product of the addition-curable organopolysiloxane composition according to claim 5 .

16 . A release film having a cured film consisting of a cured product of the addition-curable organopolysiloxane composition according to claim 2 .

17 . A release film having a cured film consisting of a cured product of the addition-curable organopolysiloxane composition according to claim 3 .

18 . The addition-curable organopolysiloxane composition according to claim 1 ,
wherein component (A) is represented by the following average formula (1):
( R 3 SiO 1/2 ) a ( R 2 PSiO 1/2 ) b ( R 2 ASiO 1/2 ) c ( R 2 SiO 2/2 ) d (RPSiO 2/2 ) e (RASiO 2/2 ) f (RSiO 3/2 ) g (PSiO 3/2 ) h (ASiO 3/2 ) i (SiO 4/2 ) j   (1)

wherein R is, independently of each other, a substituted or unsubstituted monovalent hydrocarbon group having 1 to 12 carbon atoms, which has no aliphatic unsaturation, P is an alkenyl group represented by the formula:—(CH 2 ) n —CH═CH 2 wherein n is 0 or a positive number of 0 to 6, A is a (meth) acrylic group-containing group represented by the formula: CH 2 ═CR 2 COR 3 —, R 2 is a hydrogen atom or a methyl group, R 3 is a divalent group that is OR 4 or R 4 , and R 4 is a divalent organic group having 1 to 20 carbon atoms which may have a branched or cyclic structure and may contain an epoxy group, an ester bond, an urethane bond, an ether bond, an isocyanate bond, or a hydroxy group, a, b, c, e, h, i, and f are, independently of each other, 0 or a positive number, b, e, and n are not 0 at the same time and satisfy the equation 2≤b+e+h≤300, dis a positive number of 50 to 4,000, g is 0 or a positive number of 0 to 50, j is 0 or a positive number of 0 to 50, c, f, and i are not 0 at the same time and satisfy the equation 0.01≤c+f+i≤1.0.

19 . A release paper having a cured film consisting of a cured product of the addition-curable organopolysiloxane composition according to claim 18 .

20 . A release film having a cured film consisting of a cured product of the addition-curable organopolysiloxane composition according to claim 18 .

Assignees

• Shinetsu Chemical Co

Inventors

• Ihara Toshiaki
• Kimura Tsuneo

Classifications

• C09J7/401

  characterised by the release coating composition · CPC title

• D21H27/001 Primary

  Release paper · CPC title

• D21H19/32

  obtained by reactions forming a linkage containing silicon in the main chain of the macromolecule · CPC title

• C08G77/20

  containing silicon bound to unsaturated aliphatic groups · CPC title

• C08G77/12

  containing silicon bound to hydrogen · CPC title