Ultraviolet-curable silicone resin composition for use in coating optical fibers
Patent 4935455 Issued on June 19, 1990. Estimated Expiration Date: 
May 10, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 10, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3816282 Ultraviolet radiation curable silicone release compositions Resinous copolymeric siloxanes containing alkenyldimethylsiloxanes Quartz glass-made optical fibers coated with a silicone composition Radiation-curable organopolysiloxane compositions Patent #: 4707503 InventorsAssigneeApplicationNo. 349674 filed on 05/10/1989US Classes:522/99, Processes involving a polysiloxane having ethylenic unsaturation as reactant or as solid polymer; or compositions therefore522/83, Oxygen containing DNRM524/860, Poly (di organo siloxane) reactant, i.e., (R-Si(R)-O)-* where R is an organic radical and * is subscript two or more528/30, From silicon-containing reactant having at least one polyvalent atom other than carbon, oxygen, or nitrogen528/32Silicon reactant contains an ethylenically unsaturated groupExaminersPrimary: Bleutge, John C.Assistant: Berman, Susan W. Attorney, Agent or FirmForeign Patent References
International ClassC08G 077/20Foreign Application Priority Data1988-05-12 JPAbstractAn 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, ##STR1## wherein R1 represents a substituted or unsubstituted monovalent hydrocarbon group excluding a vinyl group, and a and b are numbers defined by the formulae 0.01ࣘaࣘ1, 0.8ࣘb<3 and 1.8ࣘa+bࣘ2.2, 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 R23 SiO0.5, units represented by (CH2 =CH)c R32-c SiO wherein R2 and R3 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 SiO2,the molar ratio of the sum of the R23 SiO0.5 units and the SiO2 units to the (CH2 =CH)c R32-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 organopolysiloxane comprising units represented by R23 SiO0.5, units represented by ##STR2## and units represented by R62-e R7e SiO wherein R2, R4, R6 and R7 each independently represents a substituted or unsubstituted monovalent hydrocarbon group excluding a vinyl group, R5 represents a divalent 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 the R23 SiO0.5 units and the ##STR3## units to the R62-e R7e SiO units being in the range of from 0.05 to 0.5, the content of the 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 be weight of an ultraviolet absorber,the molar ratio of the mercaptoalkyl groups in component (C) to the vinyl group in both components (A) and (B) being in the range of from 0.2 to 2.5. | |
