Release control agent, releasable film-forming silicone composition, and release liner

Patent metadata

Field	Value
Publication number	US-12584044-B2
Application number	US-202118035250-A
Country	US
Kind code	B2
Filing date	Nov 11, 2021
Priority date	Nov 11, 2020
Publication date	Mar 24, 2026
Grant date	Mar 24, 2026

Abstract

Provided is a release control agent containing a silicone resin having a weight average molecular weight based on standard polystyrene by gel permeation chromatography of 3,000 to 6,000 and expressed by the average unit formula: (R 1 3 SiO 1/2 ) a (SiO 4/2 ) 1.0 , wherein each R 1 independently represents an alkyl group with 1 to 6 carbon atoms, and “a” represents a number from 0.5 to 1.5, and (B) a diorganopolysiloxane having at least two silicon-bonded alkenyl groups in a molecule and/or (C) an α-olefin with 12 to 24 carbon atoms. Also provided is a releasable film-forming silicone composition containing the release control agent. The releasable film-forming silicone composition forms a releasable film with little change in release force and that does not reduce the residual adhesive strength of a pressure sensitive adhesive (PSA) after long-term aging in a state adhered to the PSA despite exhibiting a relatively large release force with respect to the PSA.

First claim

The invention claimed is:

1 . A release control agent comprising:
(A) a silicone resin having a weight average molecular weight based on standard polystyrene by gel permeation chromatography of 3,000 to 6,000 and expressed by the average unit formula:
(R 1 3 SiO 1/2 ) a (SiO 4/2 ) 1.0
wherein each R 1 independently represents an alkyl group with 1 to 6 carbon atoms, and “a” represents a number from 0.5 to 1.5; (B) a diorganopolysiloxane having at least two silicon-bonded alkenyl groups in a molecule, in an amount up to 150 parts by mass relative to 100 parts by mass of component (A); and (C) a linear α-olefin with 12 to 24 carbon atoms, in an amount up to 200 parts by mass relative to 100 parts by mass of component (A).

2 . The release control agent according to claim 1 , wherein component (A) is a silicone resin containing 2 to 5 mass % of hydroxyl groups bonded to silicon atoms.

3 . The release control agent according to claim 1 , wherein component (C) is a linear α-olefin with 14 to 18 carbon atoms.

4 . The release control agent according to claim 1 , further comprising:
(D) a silicone resin expressed by the average unit formula:
(R 2 3 SiO 1/2 ) b (SiO 4/2 ) 1.0
wherein each R 2 independently represents an alkyl group with 1 to 6 carbon atoms or an alkenyl group with 2 to 6 carbon atoms, but at least one R 2 in a molecule is an alkenyl group, and “b” represents a number from 0.5 to 1.5, in an amount of at most 300 parts by mass relative to 100 parts by mass of component (A).

5 . A releasable film-forming silicone composition, comprising:
(I) the release control agent according to claim 1 ; (II) a diorganopolysiloxane having at least two silicon-bonded alkenyl groups in a molecule, in an amount of at most 400 parts by mass relative to a total of 100 parts by mass of components (A) to (C) in component (I); (III) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule, in an amount such that the amount of silicon-bonded hydrogen atoms in the present component is 0.5 to 10 mols relative to a total of 1 mol of alkenyl groups in the releasable film-forming silicone composition; and (IV) a hydrosilylation-reaction catalyst.

6 . The releasable film-forming silicone composition according to claim 5 , further comprising:
(V) a hydrosilylation reaction inhibitor in an amount of 0.001 to 5 mass % of the releasable film-forming silicone composition.

7 . The releasable film-forming silicone composition according to claim 5 , further comprising:
(VI) a silicone resin expressed by the average unit formula:
(R 2 3 SiO 1/2 ) b (SiO 4/2 ) 1.0
wherein each R 2 independently represents an alkyl group with 1 to 6 carbon atoms or an alkenyl group with 2 to 6 carbon atoms, but at least one R 2 in a molecule is the alkenyl group, and “b” represents a number from 0.5 to 1.5, in an amount of at most 50 parts by mass relative to a total of 100 parts by mass of components (A) to (C) in component (I).

8 . A release liner, wherein a releasable film is formed on a surface of a film or tape base material by the releasable film-forming silicone composition according to claim 5 .

9 . The release control agent according to claim 1 , wherein component (A) has a weight average molecular weight of 4,000 to 5,000.

10 . The release control agent according to claim 1 , wherein component (C) is selected from the group consisting of 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene, and 1-eicosene.

11 . The release control agent according to claim 4 , further comprising:
(E) an organic solvent, in an amount of at most 100 parts by mass relative to 100 parts by mass of component (A).

Assignees

• Dow Toray Co Ltd

Inventors

• Hino Takakazu
• Endo Syuji
• Nishijima Kazuhiro

Classifications

• C09J2483/005

  in the release coating · CPC title

• C08G77/20

  containing silicon bound to unsaturated aliphatic groups · CPC title

• C08L83/04

  Polysiloxanes · CPC title

• C09J183/04

  Polysiloxanes · CPC title

• C09D5/20

  for coatings strippable as coherent films, e.g. temporary coatings strippable as coherent films · CPC title