US4889901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultraviolet-curable blends of acrylated polyurethanes and silsesquioxane oligomers having improved adhesion to glass
Assignee: Covestro Resins BV
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Filing: 1988-11-16
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Granted: 1989-12-26
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Expires: 2008-11-16
Abstract
Abstract A light-curable ethylenically unsaturated liquid coating composition which cures to provide low modulus coatings adapted for the primary or single coat coating of optical glass fiber and having improved adhesion is disclosed. This composition comprises: (1) an acrylate-terminated polyurethane oligomer; (2) a monoethylenically unsaturated liquid having a glass transition temperature, measured on a homopolymer thereof, below about 0 DEG C. and which reduces the glass transition temperature of the coating; and (3) a silsesquioxane oligomer polyacrylate which is the condensation reaction product of about two moles of hydroxyalkyl acrylate in which the alkyl group contains from 2 to 4 carbon atoms, with about one mole of a silsesquioxane polysilanol, the proportion of the silsesquioxane oligomer polyacrylate is in the range of from about 2% to about 60% of the weight of the coating composition.
Inventors
- 👤 Sami A. Shama
- 👤 John L. Derer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:45
CPC Classifications
C; C09; C09D; C09D4/00; C09D175/00; C09D175/04; C09D175/14; C09D175/16; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2962
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
127 words
A light-curable ethylenically unsaturated liquid coating composition which cures to provide low modulus coatings adapted for the primary or single coat coating of optical glass fiber and having improved adhesion comprising: (1) an acrylate-terminated polyurethane oligomer; (2) a monoethylenically unsaturated liquid having a glass transition temprature, measured on a homopolymer thereof, below about 0° C. and which reduces the modulus of the coating; and (3) a silsesquioxane oligomer polyacrylate which is the condensation reaction product of about two moles of hydroxyalkyl acrylate in which the alkyl group contains from 2 to 4 carbon atoms, with about one mole of a silsesquioxane polysilanol, the proportion of said silsesquioxane oligomer polyacrylate being in the range of from about 2% to about 60% of the weight of said coating composition.
Claim 2
Dependent Claim
127 words
A light-curable ethylenically unsaturated liquid coating composition which cures to provide low modulus coatings adapted for the primary or single coat coating of optical glass fiber and having improved adhesion comprising: (1) an acrylate-terminated polyurethane oligomer; (2) a monoethylenically unsaturated liquid having a glass transition temprature, measured on a homopolymer thereof, below about 0° C. and which reduces the modulus of the coating; and (3) a silsesquioxane oligomer polyacrylate which is the condensation reaction product of about two moles of hydroxyalkyl acrylate in which the alkyl group contains from 2 to 4 carbon atoms, with about one mole of a silsesquioxane polysilanol, the proportion of said silsesquioxane oligomer polyacrylate being in the range of from about 2% to about 60% of the weight of said coating composition.
Claim 3
Dependent Claim
28 words
A liquid coating composition as recited in claim 1 in which said acrylate-terminated polyurethane oligomer is made using polycarbonate or polyester diol in the production of said polyurethane.
Claim 4
Dependent Claim
42 words
A liquid coating composition as recited in claim 1 in which said acrylate-terminated polyurethane oligomer is a diacrylate of an isocyanate-terminated oligomer made from a polymeric diol, said oligomer having a molecular weight in one range of about 2000 to about 8000.
Claim 5
Dependent Claim
47 words
A liquid coating composition as recited in claim 1 in which coating viscosity is provided by the presence of a monoethylenically unsaturated liquid having a glass transition temperature, measured on a homopolymer thereof, below about 0° C. and which reduces the glass transition temperature of the coating.
Claim 6
Dependent Claim
19 words
A liquid coating composition as recited in claim 4 in which said monoethylenically unsaturated liquid is an acrylate ether.
Claim 7
Dependent Claim
34 words
A liquid coating composition as recited in claim 1 in which said silsesquioxane oligomer polyacrylate is present in an amount of from 5% to 55%, based on the total weight of the coating composition.
Claim 8
Dependent Claim
34 words
A liquid coating composition as recited in claim 6 in which said silsesquioxane oligomer polyacrylate is present in an amount of from 8% to 30%, based on the total weight of the coating composition.
Claim 9
Dependent Claim
55 words
A liquid coating composition as recited in claim 1 in which said silsesquioxane oligomer has the formula: ##STR3## in which R identifies a monovalent hydrocarbon group containing from 1 to 10 carbon atoms, and X is selected from oxygen, siloxane, polysiloxane and O--R 1 --Si linkages where R 1 =C 1 to C 4 alkylene.
Claim 10
Dependent Claim
40 words
A liquid coating composition as recited 30 in claim 8 in which said silsesquioxane oligomer has the formula: ##STR4## in which R is selected from propyl and phenyl, and n is a number having an average value of from 1-3.
Claim 11
Dependent Claim
20 words
A liquid coating composition as recited in claim 9 in which and n is an average value of about 2.
Claim 12
Dependent Claim
26 words
A liquid coating composition as recited in claim 1 in which said composition includes from about 1% to about 10% by weight of a ketonic photoinitiator.
Claim 13
Dependent Claim
15 words
An optical glass fiber coated with a light-cured coating of the composition of claim 9.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-25 | 1993-06-26 | 1993-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-25 | 1997-06-26 | 1997-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-25 | 2001-06-26 | 2001-12-26 | $7700.00 | Window Closed / Lapsed |