Ultraviolet ray curable silicone adhesive composition and cured product thereof
(A) an organopolysiloxane having, per molecule, two groups each represented by formula (1) (R 1 represents a C 1-20 monovalent hydrocarbon group, R 2 represents an oxygen atom or the like, R 3 represents an acryloyloxyalkyl group or the like, and p and a respectively represent numbers satisfying 0-10 and 1-3); (B) a monofunctional (meth)acrylate compound not including a siloxane structure; (C) an organopolysiloxane resin which comprises a unit (a) represented by formula (2) (R 1 , R 2 , R 3 , a, and p are identical to those described above), a R 4 3 SiO 1/2 unit (b) (in the formula, R 4 represents a monovalent hydrocarbon group having 1-10 carbon atoms), and a SiO 4/2 unit (c), and in which the mole ratio of the total of units (a) and (b) to unit (c) is in a range of 0.4 to 1.2:1; and (D) a photoinitiator.
1. A UV-curable silicone pressure-sensitive adhesive composition comprising:
(A) 100 parts by weight of an organopolysiloxane containing per molecule two groups having the general formula (1):
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 each independently an acryloyloxyalkyl, methacryloyloxyalkyl, acryloyloxyalkyloxy or methacryloyloxyalkyloxy group, p is a number of 0 to 10, and “a” is a number of 1 to 3,
(B) 1 to 200 parts by weight of a monofunctional (meth)acrylate compound free of a siloxane structure,
(C) 1 to 1,000 parts by weight of an organopolysiloxane resin comprising (a) units having the general formula (2):
wherein R 1 , R 2 , R 3 , a, and p are as defined above, (b) R 4 3 SiO 1/2 units wherein R 4 is a C 1 -C 10 monovalent hydrocarbon group, and (c) SiO 4/2 units, a molar ratio of the total of units (a) and (b) to units (c) being in the range of from 0.4:1 to 1.2:1, and
(D) 0.01 to 20 parts by weight of a photopolymerization initiator,
the composition being free of a non-crosslinkable organopolysiloxane resin, wherein the monofunctional (meth)acrylate compound free of a siloxane structure (B) is at least one of isoamyl acrylate, lauryl acrylate, stearyl acrylate, ethoxy-diethylene glycol acrylate, methoxy-triethylene glycol acrylate, 2-ethylhexyl diglycol acrylate, phenoxyethyl acrylate, phenoxydiethylene glycol acrylate, tetrahydrofurfuryl acrylate, and isobornyl acrylate.
2. The UV-curable silicone pressure-sensitive adhesive composition of claim 1 , further comprising (E) 1 to 20 parts by weight of finely divided silica per 100 parts by weight of component (A).
3. The UV-curable silicone pressure-sensitive adhesive composition of claim 1 , further comprising (F) 0.001 to 10 parts by weight of an antistatic agent per 100 parts by weight of component (A).
4. A cured product of the UV-curable silicone pressure-sensitive adhesive composition of claim 1 .
5. The cured product of claim 4 having a tensile strength of at least 1 MPa according to JIS-K6249 at a thickness of 2.0 mm.
6. A pressure-sensitive adhesive agent comprising the cured product of claim 4 .
7. A pressure-sensitive adhesive sheet comprising the cured product of claim 4 .
8. A microstructure-transferring stamp comprising the cured product of claim 4 .
9. The microstructure-transferring stamp of claim 8 having at least one protrusion structure.
10. A microstructure-transferring apparatus comprising the microstructure-transferring stamp of claim 8 .