Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
108 words
An ultraviolet curing liquid coating composition which, when cured with ultraviolet light in the presence of an appropriate photoinitiator, provides a buffer coating for optical glass fiber consisting essentially of a linear polyacrylate-terminated polyurethane or polyurea oligomer in admixture with a liquid acrylate-functional material which does not increase the low temperature hardness and which provides the liquidity needed for coating application, said polyacrylate-terminated polyurethane or polyurea oligomer having a room temperature tensile modulus of at least 100 psi., and a tensile modulus at -60°C. which is less than 175,000 psi., when capped with 2-hydroxyethyl acrylate and cured with ultraviolet light, said oligomer being capped with a monohydric polyacrylate.
Claim 2
Dependent Claim
108 words
An ultraviolet curing liquid coating composition which, when cured with ultraviolet light in the presence of an appropriate photoinitiator, provides a buffer coating for optical glass fiber consisting essentially of a linear polyacrylate-terminated polyurethane or polyurea oligomer in admixture with a liquid acrylate-functional material which does not increase the low temperature hardness and which provides the liquidity needed for coating application, said polyacrylate-terminated polyurethane or polyurea oligomer having a room temperature tensile modulus of at least 100 psi., and a tensile modulus at -60°C. which is less than 175,000 psi., when capped with 2-hydroxyethyl acrylate and cured with ultraviolet light, said oligomer being capped with a monohydric polyacrylate.
Claim 3
Dependent Claim
25 words
A coating composition as recited in claim 1 in which said acrylate-functional liquid is a monoacrylate monomer having a glass transition temperature below about 0°C.
Claim 4
Dependent Claim
46 words
A coating composition as recited in claim 1 in which said acrylate-functional liquid is a linear aliphatic diacrylate in which the two acrylate groups are separated by a chain of at least 6 carbon atoms or by a molecular weight of from 400 to about 4000.
Claim 5
Dependent Claim
103 words
A coating composition as recited in claim 1 in which said diisocyanate includes a linear aliphatic chain containing at least 6 carbon atoms separating the two isocyanate groups, and this diisocyanate is reacted with a dihydric or diamino polyether or polyester containing alkylene groups having from 1 to 6 carbon atoms and a molecular weight in the range of 500 to 4000, to form a polyurethane or polyurea diisocyanate which is half end capped with said monohydric polyacrylate and reacted with a C 1 to C 4 oxyalkylene diamine having a molecular weight of from 100 to 600 to consume the isocyanate functionality.
Claim 6
Dependent Claim
19 words
A coating composition as recited in claim 4 in which said diisocyanate is provided by dimer fatty acid diisocyanate.
Claim 7
Dependent Claim
33 words
A coating composition as recited in claim 5 in which said diisocyanate is reacted with a polyether which is a polyoxyalkylene glycol having a molecular weight in the range of 1000 to 3000.
Claim 8
Dependent Claim
23 words
A coating composition as recited in claim 6 in which the oxyalkylene group of said polyoxyalkylene glycol contains 2 or 3 carbon atoms.
Claim 9
Dependent Claim
16 words
A coating composition as recited in claim 7 in which said monohydric polyacrylate is pentaerythritol polyacrylate.
Claim 10
Dependent Claim
32 words
A coating composition as recited in claim 1 in which said low glass transition temperature monomer is selected from the group consisting of ethoxyethoxyethyl acrylate, phenoxyethyl acrylate, butoxyethyl acrylate, and 2-hydroxyethyl acrylate.
Claim 11
Dependent Claim
15 words
An optical glass fiber coated with an ultraviolet-cured coating of the composition of claim 1.