UV curable silicone adhesive composition and cured product thereof

Patent metadata

Field	Value
Publication number	US-11180680-B2
Application number	US-201816646743-A
Country	US
Kind code	B2
Filing date	Sep 19, 2018
Priority date	Sep 29, 2017
Publication date	Nov 23, 2021
Grant date	Nov 23, 2021

Abstract

This composition contains (A) 100 parts of an organopolysiloxane having two groups represented by general formula (1)

(R 1 represents a monovalent hydrocarbon group having 1-20 carbon atoms, R 2 represents an oxygen atom or the like, R 3 represents an acryloyloxyalkyl group or the like, p represents a number satisfying 0≤p≤10, and “a” represents a number satisfying 1≤a≤3) per molecule, (B) 1-500 parts of a monofunctional (meth)acrylate compound not containing a siloxane structure, (C) 1-5,000 parts of an organopolysiloxane resin containing (a) an R 4 3 SiO 1/2 unit (in the formula, R 4 represents a monovalent hydrocarbon group having 1-10 carbon atoms) and (b) a SiO 4/2 unit, where the molar ratio of the unit (a) to the unit (b) is in the range of 0.6 to 1.2:1, (D) 1-100 parts of fine powder silica, and (E) 0.01-20 parts of an optical polymerization initiator. The compound has good shape retention properties and curability for irradiation with ultraviolet light, and provides a cured product which has excellent adhesion suitable for a temporary fixing material.

First claim

The invention claimed is:

1. A UV cure type silicone pressure-sensitive adhesive composition comprising:
(A) 100 parts by weight of an organopolysiloxane having, in the molecule, two groups of the following general formula (1) and a backbone consisting essentially of repeating diorganosiloxane units, wherein the number of the repeating diorganosiloxane units is 1 to 600:

wherein R 1 is each independently a C 1 -C 20 monovalent hydrocarbon group, R 2 is oxygen or a C 1 -C 20 alkylene group, R 3 is an acryloyloxyalkyl, methacryloyloxyalkyl, acryloyloxyalkyloxy or methacryloyloxyalkyloxy group, p is a number in the range: 0≤p≤10, and a is a number in the range: 1≤a≤3,
(B) 1 to 500 parts by weight of a monofunctional (meth)acrylate compound free of siloxane structure,
(C) 1 to 5,000 parts by weight of an organopolysiloxane resin composed of (a) R 4 3 SiO 1/2 units wherein R 4 is a C 1 -C 10 monovalent hydrocarbon group and (b) SiO 4/2 units, a molar ratio of (a) units to (b) units being in the range of from 0.6/1 to 1.2/1,
(D) 1 to 100 parts by weight of finely divided silica, and
(E) 0.01 to 20 parts by weight of a photopolymerization initiator.

2. The UV cure type silicone pressure-sensitive adhesive composition of claim 1 wherein a ratio (AB) of viscosity A at 23° C. and a rotational speed of 2 rpm to viscosity B at 23° C. and a rotational speed of 10 rpm, that is, thixotropic index is from 1.1 to 10.

3. The UV cure type silicone pressure-sensitive adhesive composition of claim 1 wherein a viscosity B at a rotational speed of 10 rpm is in the range of 10 to 5,000 Pa·s.

4. A cured product of the UV cure type silicone pressure-sensitive adhesive composition of claim 1 .

5. A pressure-sensitive adhesive comprising the cured product of claim 4 .

6. A pressure-sensitive adhesive sheet comprising the cured product of claim 4 .

7. A microstructure transfer stamp comprising the cured product of claim 4 .

8. The microstructure transfer stamp of claim 7 , having at least one protrusion.

9. A microstructure transfer apparatus comprising the microstructure transfer stamp of claim 7 .

Assignees

• Shinetsu Chemical Co

Inventors

• Otake Kohei
• Matsumoto Nobuaki
• ASAKURA Eri

Classifications

• C09J183/04 Primary

  Polysiloxanes · CPC title

• C08G77/70

  Siloxanes defined by use of the MDTQ nomenclature · CPC title

• C09J7/38

  Pressure-sensitive adhesives [PSA] · CPC title

• C09J2483/00

  Presence of polysiloxane · CPC title

• C09J183/06 Primary

  containing silicon bound to oxygen-containing groups (C09J183/12 takes precedence) · CPC title