US3655483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of manufacturing stratified materials of glass fibers and polyesters using ultra-violet irradiation
Assignee: Progil SARL
•
Filing: 1970-06-10
•
Granted: 1972-04-11
•
Expires: 1990-06-10
Abstract
Abstract A laminate of improved properties is obtained by photopolymerization of a polyester in two stages including an intense but brief first stage and a longer less intense second stage, whereby the ethylenically unsaturated monomer migrates in part to the surface of the laminate.
Inventors
- 👤 Philippe Borrel
- 👤 Jean Lehureau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:00
CPC Classifications
C; C08; C08F; C08F283/00; C08F283/01; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T442/00; Y10T442/20; Y10T442/2926; Y10T442/2992
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A process according to claim 1 in which photopolymerization is carried out continuously by passing the polyester resin/glass fibers material between a series of radiation lamps having wave lengths comprised between 1,500 and 5,000 angstroms, the first lamps of which are placed between 5 and 25 cms from the surfAce to irradiated to provide an intensity of 1-5 watts/cm2 while the second lamps are placed at a further distance, generally 30 to 100 cms, from said surface to provide an intensity of 0.9 to 0.01 watts/cm2.
Claim 2
Dependent Claim
31 words
A process according to claim 2 in which the first irradiation phase lasts from 5 to 20 seconds while hardening time, under second lamps exposure, is from 5 to 20 minutes.
Claim 3
Dependent Claim
28 words
A process according to claim 1 in which the polyester resin is a styrene solution of a polycondensation product of maleic and phthalic anhydrides with an alkylene glycol.
Claim 4
Dependent Claim
28 words
A process according to claim 1 in which the photoinitiator is a benzoin alkyl ether used in an amount of 0.01 to 10% related/the weight of the resin.
Claim 5
Dependent Claim
25 words
A process according to claim 5 wherein said resin further has mixed therewith up to 1% by weight of a regulator of U.V. radiation absorption.
Claim 6
Dependent Claim
32 words
Stratified materials based on glass fibers and unsaturated polyester resins obtained according to claim 1 wherein the surface of said material is richer in ethylenically unsaturated monomer units than the center thereof.
References Cited (Backward Citations)
CA611764A
Cited
US3582487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |