EP0141330A1 — Ultraviolet curable outer coatings for optical fi…

Claim 1

Independent Claim 169 words

An ultraviolet curable coating composition which, when formed into 0,076 mm(3 mil) cured test film, has a tensile strength of 1724 N/cm 2 (2500 psi) a tensile modulus measured at room temperature ofat least 34475N/cm 2 (50,000 psi.), and an elongation in excess of about 40%, said composition comprising from 30% up to about 80% of total reactive components of diacrylate-functional polyurethane which is the linear polyurethane reaction product of polycarbonate diol with organic diisocyanate end capped with acrylate groups and having the formula: in which R is alkylene having from 1-20 carbon atoms; R' is the residue of an alkylene diol containing from 2-12 carbon atoms; Q is the residue of an organic diisocyanate; X is the residue of acrylic acid; y is at least 1; and R' and y are selected to provide a molecular weight for the polycarbonate diol reactant of from 300 to 3000, and at least 15% of total reactive components of liquid monoethylenically unsaturated monomer having a glass transition temperature above about 55°C.

Claim 2

Dependent Claim 169 words

An ultraviolet curable coating composition which, when formed into 0,076 mm(3 mil) cured test film, has a tensile strength of 1724 N/cm 2 (2500 psi) a tensile modulus measured at room temperature ofat least 34475N/cm 2 (50,000 psi.), and an elongation in excess of about 40%, said composition comprising from 30% up to about 80% of total reactive components of diacrylate-functional polyurethane which is the linear polyurethane reaction product of polycarbonate diol with organic diisocyanate end capped with acrylate groups and having the formula: in which R is alkylene having from 1-20 carbon atoms; R' is the residue of an alkylene diol containing from 2-12 carbon atoms; Q is the residue of an organic diisocyanate; X is the residue of acrylic acid; y is at least 1; and R' and y are selected to provide a molecular weight for the polycarbonate diol reactant of from 300 to 3000, and at least 15% of total reactive components of liquid monoethylenically unsaturated monomer having a glass transition temperature above about 55°C.

Claim 3

Dependent Claim 34 words

A coating composition as recited in claim 1 in which R has 2-4 carbon atoms, R' has 3-8 carbon atoms, and the molecular weight of the polycarbonate diol reactant is from 600 to 1500.

Claim 4

Dependent Claim 26 words

A coating composition as recited in claim 2 in which R is the ethylene radical, and R' is the residue of 1,4-butane diol or 1,6-hexane diol.

Claim 5

Dependent Claim 32 words

A coating composition as recited in claim 1 in which said monoethylenically unsaturated monomer is selected from the group consisting of dimethyl acrylamide, N-vinyl pyrrolidone, isobornyl acrylate, acrylic acid and dicyclopentenyl acrylate.

Claim 6

Dependent Claim 24 words

A buffer-coated and topcoated optical glass fiber in which the topcoat is an ultraviolet cured coating of the coating composition recited in claim 1.

Claim 7

Dependent Claim 28 words

A coated optical fiber as recited in claim 5 in which said buffer coating on said optical glass fiber has a room temperature tensile modulus below 10,000 psi.

Claim 8

Dependent Claim 28 words

A coated optical fiber as recited in claim 6 in which said buffer coating on said optical glass fiber has a room temperature tensile modulus below 2,000 psi.

Claim 9

Dependent Claim 204 words

A resin buffer-coated and topcoated optical glass fiber in which the buffer coating has a room temperature tensile modulus of less than 10,000 psi, and the topcoat is an ultraviolet cured coating which in a 0,076 mm(3 mil) test film, has a tensile strength of at least 1724N/cm 2 (2500 psi) a tensile modulus measured at room temperature of at least 34475N/cm 2 (50000 psi), and an elongation in excess of about 100%, said topcoat comprising from 40% up to about 70% of total reactive components of diacrylate-functional polyurethane which is the linear polyurethane reaction product of polycarbonate diol with organic diisocyanate end capped with acrylate groups and having the formula: in which R is alkylene having from 2-4 carbon atoms; R' is the residue of an alkylene diol containing from 3-8 carbon atoms; Q is the residue of an organic diisocyanate; X is the residue of acrylic acid; y is at least 1; and R' and y are selected to prov.de a molecular weight for the polycarbonate diol reactant of from 600 to 1500, and at least 15% of total reactive components of monoethylenically unsaturated monomer selected from the group consisting of dimethyl acrylamide, N-vinyl pyrrolidone, isobornyl acrylate, acrylic acid and dicyclopentenyl acrylate.

Claim 10

Dependent Claim 204 words

A resin buffer-coated and topcoated optical glass fiber in which the buffer coating has a room temperature tensile modulus of less than 10,000 psi, and the topcoat is an ultraviolet cured coating which in a 0,076 mm(3 mil) test film, has a tensile strength of at least 1724N/cm 2 (2500 psi) a tensile modulus measured at room temperature of at least 34475N/cm 2 (50000 psi), and an elongation in excess of about 100%, said topcoat comprising from 40% up to about 70% of total reactive components of diacrylate-functional polyurethane which is the linear polyurethane reaction product of polycarbonate diol with organic diisocyanate end capped with acrylate groups and having the formula: in which R is alkylene having from 2-4 carbon atoms; R' is the residue of an alkylene diol containing from 3-8 carbon atoms; Q is the residue of an organic diisocyanate; X is the residue of acrylic acid; y is at least 1; and R' and y are selected to prov.de a molecular weight for the polycarbonate diol reactant of from 600 to 1500, and at least 15% of total reactive components of monoethylenically unsaturated monomer selected from the group consisting of dimethyl acrylamide, N-vinyl pyrrolidone, isobornyl acrylate, acrylic acid and dicyclopentenyl acrylate.

Claim 11

Dependent Claim 74 words

A method of topcoating resin buffer-coated optical glass fiber in which the topcoat has the high strength and modulus combined with good elongation and water resistance associated with extruded jacket coatings, but which is applied by ordinary coating procedures and cured by exposure to ultraviolet radiation comprising, applying to resin buffer-coated optical glass fiber the ultraviolet-curable coating composition of claim 1, and then exposing the wet-coated fiber to ultraviolet light to cure the coating.

Claim 12

Dependent Claim 26 words

A method as recited in claim 9 in which said buffer coating on said optical glass fiber has a room temperature tensile modulus below 10,000 psi.

Claim 13

Dependent Claim 29 words

A method as recited in claim 9 in which said coating composition contains up to 45% of said monoethylenically unsaturated monomer having a glass transition temperature above about 55°C.

Ultraviolet curable outer coatings for optical fiber

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