US4806574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultraviolet curable coatings for optical glass fiber based on a polyfunctional core
Assignee: Covestro Resins BV
•
Filing: 1985-07-22
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Granted: 1989-02-21
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Expires: 2005-07-22
Abstract
Abstract An ultraviolet curing liquid coating composition which, when cured with ultraviolet light in the presence of an appropriate photoinitiator, provides a coating adapted for the coating of optical glass fiber. This coating composition comprises as the essential component, an acrylate-terminated polyurethane oligomer based on a polyfunctional core which is at least trifunctional and which supports one branch for each functionality in the core. Each of the branches leads to an acrylate-functional terminal group, with there being from about 150 to about 2500 units of molecular weight in each branch between the trifunctional core and the acrylate-functional terminal group. Depending primarily upon the molecular weight of the branches, one can provide coating compositions for buffer coat, single coat or topcoat use.
Inventors
- 👤 John J. Krajewski
- 👤 Timothy E. Bishop
- 👤 Clive J. Coady
- 👤 John M. Zimmerman
- 👤 Gerry K. Noren
- 👤 Christopher E. Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:38
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/671; C08G18/672; C03; C03C; C03C25/00; C03C25/10; C03C25/104; C03C25/106; C03C25/1065; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5024; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; C08G18/7831; C08G18/79; C08G18/791; C08G18/792; C08G18/81; C08G18/8141; C08G18/815; C08G18/8158; C08G18/8175
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
155 words
A volatile solvent-free ultraviolet curing liquid coating composition which, when cured with ultraviolet light, provides a coating adapted for the buffer coating of optical glass fiber, said coating composition consisting essentially of a photoinitiator, sufficient acrylate-functional liquid having a glass transition temperature below about 0° C. to provide the liquidity needed for coating application, and an acrylate-terminated polyurethane oligomer based on a polyfunctional core, said oligomer being the reaction product of organic diisocyanate with compound having a plurality of isocyanate-reactive functional groups, a high molecular weight trifunctional triamine providing said core and to supporting one branch for each functionality in said core, and any remainder of isocyanate-reactive compound being difunctional, each of said branches leading to an acrylate-functional terminal group bound to each branch by a urethane group or a urea group, there being from about 1000 to about 2500 units of molecular weight in each branch between said core and said acrylate-functional terminal group.
Claim 2
Dependent Claim
155 words
A volatile solvent-free ultraviolet curing liquid coating composition which, when cured with ultraviolet light, provides a coating adapted for the buffer coating of optical glass fiber, said coating composition consisting essentially of a photoinitiator, sufficient acrylate-functional liquid having a glass transition temperature below about 0° C. to provide the liquidity needed for coating application, and an acrylate-terminated polyurethane oligomer based on a polyfunctional core, said oligomer being the reaction product of organic diisocyanate with compound having a plurality of isocyanate-reactive functional groups, a high molecular weight trifunctional triamine providing said core and to supporting one branch for each functionality in said core, and any remainder of isocyanate-reactive compound being difunctional, each of said branches leading to an acrylate-functional terminal group bound to each branch by a urethane group or a urea group, there being from about 1000 to about 2500 units of molecular weight in each branch between said core and said acrylate-functional terminal group.
Claim 3
Dependent Claim
22 words
An ultraviolet curing liquid coating composition as recited in claim 1 in which said trifunctional component is a tris-polyoxypropylene amine-trimethylol propane ether.
Claim 4
Dependent Claim
20 words
An ultraviolet curing liquid coating composition as recited in claim 1 in which said branches are terminated with monoacrylate groups.
Claim 5
Dependent Claim
20 words
An ultraviolet curing liquid coating composition as recited in claim 1 in which said branches are terminated with polyacrylate groups.
Claim 6
Dependent Claim
39 words
An ultraviolet curing liquid coating composition as recited in claim 1 in which said composition, when cured with ultraviolet light, has a ratio of the modulus at -60° C. to the modulus at 25° C. of less than 300.
Claim 7
Dependent Claim
25 words
An ultraviolet curing liquid coating composition as recited in claim 1 in which said monoacrylate monomer has a glass transition temperature below about -20° C.
Claim 8
Dependent Claim
35 words
An ultraviolet curing liquid coating composition as recited in claim 6 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 9
Dependent Claim
26 words
An ultraviolet curing liquid coating composition as recited in claim 1 in which said coating composition cures to provide an index of refraction is about 1.54-1.55.
Claim 10
Dependent Claim
16 words
An optical glass fiber buffer coated with an ultraviolet-cured coating of the composition of claim 1.
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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) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |