Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
430 words
An ultraviolet-curable silicone resin composition for use in coating optical fibers, which comprises (A) 100 parts by weight of a vinyl group-containing flowable organopolysiloxane represented by the average composition formula, ##STR8## wherein R 1 represents a substituted or unsubstituted monovalent hydrocarbon group excluding a vinyl group, and a and b are numbers defined by the formulae 0.01≦a≦1, 0.8≦b≦3 and 1.8≦a+b≦2.2, and having a viscosity as measured at 25° C. of from 50 to 10,000 cP; (B) 30 to 300 parts by weight of a vinyl group-containing organopolysiloxane resin comprising units represented by R 2 3 SiO 0 .5, units represented by (CH 2 ═CH) c R 3 2-c SiO wherein R 2 and R 3 each independently represents a substituted or unsubstituted monovalent hydrocarbon group excluding a vinyl group, and c is 0, 1 or 2, and units represented by SiO 2 , the molar ratio of the sum of the R 2 3 SiO 0 .5 units and the SiO 2 units to the (CH 2 ═CH) c R 3 2-c SiO units being in the range of from 3 to 20, the content of a vinyl group in component (B) being 1 to 25 mol %; (C) 10 to 100 parts by weight of a mercaptoalkyl group-containing organosiloxane comprising units represented by R 2 3 SiO 0 .5, units represented by ##STR9## and units represented by R 6 2-e R 7 e SiO wherein R 2 , R 4 , R 6 and R 7 each independently represents a substituted or unsubstituted monovalent hydrocarbon group having 2 to 6 carbon atoms, d is 0, 1 or 2, and e is 0, 1 or 2, the molar ratio of the sum of R 2 3 SiO 0 .5 units and the ##STR10## units to the R 6 2-e R 7 e SiO units being in the range of from 0.05 to 0.5, the content of an SH group in component (C) being 4 to 30 mol %; (D) 0.01 to 50 parts by weight of a photopolymerization initiator; (E) 0.001 to 10 parts by weight of a polymerization inhibitor; (F) 0.001 to 10 parts by weight of an antioxidant; and (G) 0.001 to 10 parts by weight of an ultraviolet absorber, the molar ratio of the mercaptoalkyl groups in component (C) to the vinyl groups in both components (A) and (B) being in the range of from 0.2 to 2.5, wherein said ultraviolet absorber (G) is selected from the group consisting of salicylic acid ultraviolet absorbers, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone and 2,2'-dihydroxy-4,4'-dimethoxybenzophenone ultraviolet, benzotriazole ultraviolet absorbers and cyanoacrylate ultraviolet absorbers.
Claim 2
Dependent Claim
430 words
An ultraviolet-curable silicone resin composition for use in coating optical fibers, which comprises (A) 100 parts by weight of a vinyl group-containing flowable organopolysiloxane represented by the average composition formula, ##STR8## wherein R 1 represents a substituted or unsubstituted monovalent hydrocarbon group excluding a vinyl group, and a and b are numbers defined by the formulae 0.01≦a≦1, 0.8≦b≦3 and 1.8≦a+b≦2.2, and having a viscosity as measured at 25° C. of from 50 to 10,000 cP; (B) 30 to 300 parts by weight of a vinyl group-containing organopolysiloxane resin comprising units represented by R 2 3 SiO 0 .5, units represented by (CH 2 ═CH) c R 3 2-c SiO wherein R 2 and R 3 each independently represents a substituted or unsubstituted monovalent hydrocarbon group excluding a vinyl group, and c is 0, 1 or 2, and units represented by SiO 2 , the molar ratio of the sum of the R 2 3 SiO 0 .5 units and the SiO 2 units to the (CH 2 ═CH) c R 3 2-c SiO units being in the range of from 3 to 20, the content of a vinyl group in component (B) being 1 to 25 mol %; (C) 10 to 100 parts by weight of a mercaptoalkyl group-containing organosiloxane comprising units represented by R 2 3 SiO 0 .5, units represented by ##STR9## and units represented by R 6 2-e R 7 e SiO wherein R 2 , R 4 , R 6 and R 7 each independently represents a substituted or unsubstituted monovalent hydrocarbon group having 2 to 6 carbon atoms, d is 0, 1 or 2, and e is 0, 1 or 2, the molar ratio of the sum of R 2 3 SiO 0 .5 units and the ##STR10## units to the R 6 2-e R 7 e SiO units being in the range of from 0.05 to 0.5, the content of an SH group in component (C) being 4 to 30 mol %; (D) 0.01 to 50 parts by weight of a photopolymerization initiator; (E) 0.001 to 10 parts by weight of a polymerization inhibitor; (F) 0.001 to 10 parts by weight of an antioxidant; and (G) 0.001 to 10 parts by weight of an ultraviolet absorber, the molar ratio of the mercaptoalkyl groups in component (C) to the vinyl groups in both components (A) and (B) being in the range of from 0.2 to 2.5, wherein said ultraviolet absorber (G) is selected from the group consisting of salicylic acid ultraviolet absorbers, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone and 2,2'-dihydroxy-4,4'-dimethoxybenzophenone ultraviolet, benzotriazole ultraviolet absorbers and cyanoacrylate ultraviolet absorbers.
Claim 3
Dependent Claim
22 words
A composition as claimed in claim 1, wherein 1 to 10% of all the monovalent hydrocarbon groups in component (A) are phenyl.
Claim 4
Dependent Claim
15 words
A composition as claimed in claim 1, wherein said photopolymerization intiator, component (D), is 2-hydroxy-2-methyl-1-phenylpropan-1-one.
Claim 5
Dependent Claim
14 words
A composition as claimed in claim 1, wherein said antioxidant, component (F), is tetrakis-methane.
Claim 6
Dependent Claim
26 words
A composition as claimed in claim 1, wherein component (G) is a benzophenone ultraviolet absorber selected from the group consisting of 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone and 2,2'-dihydroxy-4,4'-dimethoxybenzophenone.
Claim 7
Dependent Claim
15 words
A composition as claimed in claim 1, wherein component (G) is a benzotriazole-type ultraviolet absorber.
Claim 8
Dependent Claim
15 words
A composition as claimed in claim 1 wherein in the formula ##STR11## d is 0.
Claim 9
Dependent Claim
35 words
A composition as claimed in claim 1, wherein the ultraviolet absorber is selected from the group consisting of phenyl salicylate, p-t-butylphenyl salicylate, p-octylphenyl salicylate, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-5'-t-butylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-t-butylphenyl)benzotriazole, 2-(2'-hydroxy-3'5'-di-t-butylphenyl)-5-chlorobenzotriazole, 2-ethylhexyl-2-cyano-3,3'-diphenylacrylate and ethyl-2-cyano-3,3'-diphenylacrylate.