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Patent US4932750A successfully refreshed from Google Patents.
US4932750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single-coated optical fiber
Assignee: Covestro Resins BV
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Filing: 1982-12-09
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Granted: 1990-06-12
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Expires: 2002-12-09
Abstract
Abstract Radiation-curable coating compositions particularly adapted for the single coat coating of optical fibers are disclosed. These comprise (1) from 65% to 85% of a diethylenic-terminated polyurethane, which may contain urea groups, the polyurethane being based on a diisocyanate having an average molecular weight of from 400 to 5000; and (2) from 5% to 25% of an ether of a C2-C4 alkylene glycol monoester of a monoethylenically unsaturated monocarboxylic acid, the ether being selected from the group consisting of ethoxyethyl, dicyclopentenyl, phenyl, and mixtures thereof. Ethoxyethoxyethyl acrylate is particularly preferred. A triacrylate ester, such as trimethylol propane triacrylate, is also desirably present.
Inventors
- 👤 Robert E. Ansel
- 👤 Orvid R. Cutler, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:40
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/671; C03; C03C; C03C25/00; C03C25/10; C03C25/104; C03C25/106; C08F; C08F299/00; C08F299/02; C08F299/06; C08F299/065; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
172 words
A method of producing coated optical glass fiber comprising, applying to freshly formed optical glass fiber a coating of radiation-curable liquid coating composition comprising: (1) from 65% to 85% of the coating composition of a diacrylate-terminated polyurethane, said polyurethane being based on a diisocyanate having an average molecular weight of from 800 to 2500 and which is the reaction product of an organic diisocyanate with an aliphatic diol, said polyurethane containing from 2-4 urethane groups; (2) from 5% to 25% of the coating composition of an ether of a C 2 -C 4 alkylene glycol monoester of acrylic acid, the ether being selected from the group consisting of ethoxyethyl, dicyclopentenyl and phenyl ethers, and mixtures of said ethers, and (3) from 1% to 15% of the coating composition of a triacrylate ester, and then exposing the wet-coated fiber to radiation to cure the coating, said coating being a low microbending coating having a coefficient of thermal expansion of less than about 5.6×10 -5 at below the glass transition temperature of the coating.
Claim 2
Independent Claim
172 words
A method of producing coated optical glass fiber comprising, applying to freshly formed optical glass fiber a coating of radiation-curable liquid coating composition comprising: (1) from 65% to 85% of the coating composition of a diacrylate-terminated polyurethane, said polyurethane being based on a diisocyanate having an average molecular weight of from 800 to 2500 and which is the reaction product of an organic diisocyanate with an aliphatic diol, said polyurethane containing from 2-4 urethane groups; (2) from 5% to 25% of the coating composition of an ether of a C 2 -C 4 alkylene glycol monoester of acrylic acid, the ether being selected from the group consisting of ethoxyethyl, dicyclopentenyl and phenyl ethers, and mixtures of said ethers, and (3) from 1% to 15% of the coating composition of a triacrylate ester, and then exposing the wet-coated fiber to radiation to cure the coating, said coating being a low microbending coating having a coefficient of thermal expansion of less than about 5.6×10 -5 at below the glass transition temperature of the coating.
Claim 3
Dependent Claim
35 words
A method as recited in claim 1 in which said composition further includes a photoinitiator rendering the composition sensitive to ultraviolet light and the wet-coated fiber is exposed to ultraviolet light to cure the coating.
Claim 4
Dependent Claim
20 words
A method as recited in claim 1 in which said aliphatic groups are selected from polyether, polyester and polyether-ester groups.
Claim 5
Dependent Claim
30 words
A method as recited in claim 3 in which said diethylenic-terminated polyurethane is obtained from an hydroxyalkyl acrylate in which the alkyl group contains from 2 to 6 carbon atoms.
Claim 6
Dependent Claim
14 words
A method as recited in claim 4 in which said acrylate is hydroxyethyl acrylate.
Claim 7
Dependent Claim
16 words
A method as recited in claim 1 in which said alkylene glycol monoester is ethoxyethoxyethyl acrylate.
Claim 8
Dependent Claim
16 words
A method as recited in claim 2 in which said alkylene glycol monoester is ethoxyethoxyethyl acrylate.
Claim 9
Dependent Claim
15 words
A method as recited in claim 1 in which said triacrylate is trimethylol propane triacrylate.
Claim 10
Dependent Claim
23 words
A method as recited in claim 1 in which said alkylene glycol monoester is present in an amount of from 5% to 15%.
Claim 11
Dependent Claim
22 words
A method as recited in claim 9 in which said composition further includes a photoinitiator rendering the composition sensitive to ultraviolet light.
Claim 12
Dependent Claim
15 words
An optical glass fiber coated with a radiation-cured coating by the method of claim 1.
Claim 13
Dependent Claim
15 words
An optical glass fiber coated with a radiation-cured coating by the method of claim 2.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |