US4932750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single-coated optical fiber
Assignee: Covestro Resins BV
•
Filing: 1982-12-09
•
Granted: 1990-06-12
•
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 20:36
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.
References Cited (Backward Citations)
US3650669A
Cited
US3759807A
Cited
US3891523A
Cited
US3782961A
Cited
US3642943A
Cited
US3700643A
Cited
US3741918A
Cited
US3746665A
Cited
US4013806A
Cited
US3954584A
Cited
US4163809A
Cited
US4097439A
Cited
US4261872A
Cited
US4131602A
Cited
US4332329A
Cited
US4182790A
Cited
US4187366A
Cited
US4145509A
Cited
US4180598A
Cited
US4297185A
Cited
US4233425A
Cited
US4287323A
Cited
US4319811A
Cited
US4331704A
Cited
US4284731A
Cited
US4407561A
Cited
US4390589A
Cited
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 |