# US 11,078,385 B2 · Removable radiation-curable silicone composition and release sheet

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- Number: US 11,078,385 B2
- Document ID: US11078385B2
- Status: Granted
- Kind: B2
- Application number: 16/604,758
- Filed: 2018-04-03
- Published: 2020-02-20
- Granted: 2021-08-03
- Earliest claimed: 2017-04-13
- Assignees: Shin-Etsu Chemical Co., Ltd.
- Applicants: Shin-Etsu Chemical Co., Ltd.
- Inventors: Kenji Tanaka; Shunji Aoki; Munenao Hirokami; Tetsuro Yamada
- Web page: https://patentgrep.com/patent/US11078385B2

## CPC

- C09J 7/401: {characterised by the release coating composition}
- C08K 5/103: with polyalcohols
- C08K 5/5425: containing at least one C=C bond
- C08L 83/08: containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
- C09D 183/04: Polysiloxanes
- C09D 183/08: containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
- C09J 7/40: characterised by release liners
- C09K 3/00: Materials not provided for elsewhere
- C08G 77/20: containing silicon bound to unsaturated aliphatic groups
- C08G 77/28: sulfur-containing groups
- C09J 2400/28: Presence of paper
- C09J 2433/005: in the release coating
- C09J 2483/005: in the release coating
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

Provided are: a removable radiation-curable silicone composition which has excellent radiation curability and gives cured objects having excellent adhesiveness to the substrates; and a release sheet. The removable radiation-curable silicone composition comprises the following components (A), (B), (C), and (D): (A) 100 parts by mass of an organopolysiloxane having an alkenyl group; (B) 1-30 parts by mass of an organopolysiloxane having a mercaptoalkyl group; (C) 0.1-5 parts by mass of a compound having a plurality of acryl groups in the molecule; and (D) 0.1-15 parts by mass of a radical polymerization initiator.

## Claims

### Claim 1

A releasable radiation-curable silicone composition comprising the following components (A), (B), (C), and (D):
(A) 100 parts by weight of an alkenyl-containing organopolysiloxane having the average compositional formula (1):
wherein R1 which may be the same or different is a C1-C10 monovalent hydrocarbon group, a≥0, b≥0, c≥0, d≥0, and 2≤a+b+c+d≤8,000, a, b, c, and d are selected such that at least two silicon-bonded alkenyl groups are present per molecule,
(B) 1 to 30 parts by weight of a mercaptoalkyl-containing organopolysiloxane having the average compositional formula (2):
wherein R2 which may be the same or different is a C1-C10 monovalent hydrocarbon group or mercaptoalkyl group, e≥0, f≥0, g≥0, h≥0, and 2≤e+f+g+h≤300, R2, e, f, g, and h are selected such that at least two silicon-bonded mercaptoalkyl groups are present per molecule,
(C) 0.1 to 5 parts by weight of a compound having a plurality of acrylic groups per molecule, and
(D) 0.1 to 15 parts by weight of a radical polymerization initiator,
wherein component (C) is a silane compound having at least three acrylic groups per molecule or a hydrolytic condensate thereof.

### Claim 2 (depends on 1)

A release sheet prepared by coating the releasable radiation-curable silicone composition of claim 1 onto a substrate and irradiating radiation to the coating for curing the coating.

### Claim 3

A releasable radiation-curable silicone composition comprising the following components (A), (B), (C), and (D):
(A) 100 parts by weight of an alkenyl-containing organopolysiloxane having the average compositional formula (1):
wherein R1 which may be the same or different is a C1-C10 monovalent hydrocarbon group, a≥0, b≥0, c≥0, d≥0, and 2≤a+b+c+d≤8,000, R1, a, b, c, and d are selected such that at least two silicon-bonded alkenyl groups are present per molecule,
(B) 1 to 30 parts by weight of a mercaptoalkyl-containing organopolysiloxane having the average compositional formula (2):
wherein R2 which may be the same or different is a C1-C10 monovalent hydrocarbon group or mercaptoalkyl group, e≥0, f≥0, g≥0, h≥0, and 2≤e+f+g+h≤300, R2, e, f, g, and h are selected such that at least two silicon-bonded mercaptoalkyl groups are present per molecule,
(C) 0.1 to 5 parts by weight of a silane compound having a plurality of acrylic groups per molecule, and
(D) 0.1 to 15 parts by weight of a radical polymerization initiator.