Optical fibers and core - forming compositions
First Claim
1. A composition for forming optical fiber cores, comprising(A) an organopolysiloxane having a unit of formula (1):
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space="preserve" listing-type="equation">R.sup.1 SiO.sub.3/2 (
1)wherein R1 is an unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms in its molecule or a halogenated derivative thereof and has at least 0.05 alkenyl groups, each directly attached to a silicon atom, per silicon atom,(B) an organopolysiloxane having at least 2 hydrogen atoms each directly attached to a silicon atom per molecule,(C'"'"') a platinum catalyst or a radical polymerization initiator or both, and(E) a carboxylate of formula (3);
##STR6## wherein RA a hydrogen or a methyl group and RB is hydrogen an unsubstituted monovalent hydrocarbon group having 1 to 18 carbon atoms or a halogenated monovalent hydrocarbon group having 1 to 18 carbon atoms;
wherein said carboxylate (E) is contained in an amount of about 0.5 to about 50% by weight based on the total weight of the composition.
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Abstract
A composition comprising (A) an organopolysiloxane having a unit of the formula: R1 SiO3/2 wherein R1 is methyl, phenyl or vinyl in its molecule and having at least 0.05 alkenyl groups each directly attached to a silicon atom per silicon atom, (B) an organohydrogenpolysiloxane having at least 2 hydrogen atoms each directly attached to a silicon atom per molecule, (C) a platinum catalyst, and (D) an organosilane or organopolysiloxane of the formula: R2a (R3 O)b SiO.sub.(4-a-b)/2 wherein R2 and R3 are hydrogen, methyl, phenyl or vinyl maintains good light transmission in cured form when exposed to humidity and is thus suitable for forming cores of optical fibers. Similar benefits are obtained with a composition comprising components (A) and (B), (C'"'"') a platinum catalyst and/or a radical polymerization initiator, and (E) a carboxylate.
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Citations
19 Claims
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1. A composition for forming optical fiber cores, comprising
(A) an organopolysiloxane having a unit of formula (1): -
space="preserve" listing-type="equation">R.sup.1 SiO.sub.3/2 (
1)wherein R1 is an unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms in its molecule or a halogenated derivative thereof and has at least 0.05 alkenyl groups, each directly attached to a silicon atom, per silicon atom, (B) an organopolysiloxane having at least 2 hydrogen atoms each directly attached to a silicon atom per molecule, (C'"'"') a platinum catalyst or a radical polymerization initiator or both, and (E) a carboxylate of formula (3);
##STR6## wherein RA a hydrogen or a methyl group and RB is hydrogen an unsubstituted monovalent hydrocarbon group having 1 to 18 carbon atoms or a halogenated monovalent hydrocarbon group having 1 to 18 carbon atoms;wherein said carboxylate (E) is contained in an amount of about 0.5 to about 50% by weight based on the total weight of the composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification