Patent US4324575A successfully refreshed from Google Patents.
US4324575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low TG soft UV-curable coatings
Assignee: Furukawa Electric North America Inc
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Filing: 1980-12-24
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Granted: 1982-04-13
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Expires: 2000-12-24
Abstract
Abstract The specification describes radiation cured coatings suitable for coating fiber lightwaveguides. The coatings are relatively low modulus materials that remain rubbery throughout normal environmental temperature ranges. An exemplary coating composition comprises an oligomeric resin, which is a condensation product of a mixture of polypropylene glycols and two units of a O-hydroxy-ethylacrylate N-C aliphatic urethane, mixed with an oligomeric liquid which is a dimethylacrylate of a polyethylene glycol of molecular weight larger than 600, a monomoneric triacrylate, such as trimethylolpropane triacrylate and a photoinitiator. The coatings are free of nomoneric ingredients.
Inventors
- 👤 Nicha Levy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:48
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4825; C03; C03C; C03C25/00; C03C25/10; C03C25/104; C03C25/106; C08F; C08F299/00; C08F299/02; C08F299/06; C08F299/065; C08G18/67; C08G18/671; C08G18/672; G; G02; G02B; G02B6/00; G02B6/02; G02B6/02395
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
A method for producing a fiber lightwaveguide comprising the steps of: drawing the fiber lightwaveguide passing the drawn fiber lightwaveguide through a prepolymer mixture to wet the fiber lightwaveguide with the prepolymer mixture, passing the wetted fiber through a die to form a coating of prepolymer mixture on the fiber lightwaveguide, curing the prepolymer coating by exposing the prepolymer coated fiber lightwaveguide to radiant energy the invention characterized in that the prepolymer mixture contains a mixture of at least two oligomers having more than 10 carbon atoms and the specific rates of polymerization of the oligomers have values that match to within 15% of the smallest value.
Claim 2
Independent Claim
107 words
A method for producing a fiber lightwaveguide comprising the steps of: drawing the fiber lightwaveguide passing the drawn fiber lightwaveguide through a prepolymer mixture to wet the fiber lightwaveguide with the prepolymer mixture, passing the wetted fiber through a die to form a coating of prepolymer mixture on the fiber lightwaveguide, curing the prepolymer coating by exposing the prepolymer coated fiber lightwaveguide to radiant energy the invention characterized in that the prepolymer mixture contains a mixture of at least two oligomers having more than 10 carbon atoms and the specific rates of polymerization of the oligomers have values that match to within 15% of the smallest value.
Claim 3
Dependent Claim
13 words
The method of claim 1 in which the radiant energy is ultraviolet light.
Claim 4
Independent Claim
93 words
A method for coating a fiber lightwaveguide comprising the steps of: applying to the fiber a mixture of ##STR8## where R 1 is an aliphatic radical, R 2 is an alkyl group of 1-4 atoms, R 3 is hydrogen or methyl, and n 1 is in the range of 12 to 80 ##STR9## where R 4 is ethyl, propyl or isopropyl and n 2 is 4-15 when R 4 is ethyl and 3-80 when R 4 is propyl or isopropyl, and curing the mixture by exposing it to high energy or ultraviolet radiation.
Claim 5
Independent Claim
93 words
A method for coating a fiber lightwaveguide comprising the steps of: applying to the fiber a mixture of ##STR8## where R 1 is an aliphatic radical, R 2 is an alkyl group of 1-4 atoms, R 3 is hydrogen or methyl, and n 1 is in the range of 12 to 80 ##STR9## where R 4 is ethyl, propyl or isopropyl and n 2 is 4-15 when R 4 is ethyl and 3-80 when R 4 is propyl or isopropyl, and curing the mixture by exposing it to high energy or ultraviolet radiation.
Claim 6
Dependent Claim
33 words
The method of claim 3 in which the relative amounts of the ingredients is described by the shaded area "S" in FIG. 1 and the optional ingredient "C" is a polyfunctional acrylate monomer.
Claim 7
Dependent Claim
13 words
The method of claim 4 in which the mixture additionally includes a photoinitiator.
Claim 8
Dependent Claim
13 words
The method of claim 5 in which the photoinitiator is a chlorinated benzophenone.
Claim 9
Dependent Claim
11 words
The method of claim 3 in which: ingredient A is ##STR10##
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |