US3714007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for photopolymerizing unsaturated polyester resins in contact with immiscible liquids
Assignee: Progil SARL
•
Filing: 1970-12-01
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Granted: 1973-01-30
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Expires: 1990-12-01
Abstract
Abstract Photopolymerization of unsaturated polyester resins is carried out by submerging the resin beneath a clear liquid which provides a better heat balance.
Inventors
- 👤 P Borrel
- 👤 J Lehureau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:30
CPC Classifications
C; C08; C08F; C08F283/00; C08F283/01; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31616; Y10T428/3162
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
81 words
In a process for the photopolymerization of unsat-urated polyester resins by exposing the said resins to light radia-tions in the presence of light-sensitive initiators, the improvement comprising: putting the surface of said resin at least partly in direct contact with a liquid medium which is immiscible with said resin and transparent to the radiations which are appropriate to the initiator used, said liquid medium acting as a heat exchange medium; and carrying out the photopolymerization of said resin through said medium.
Claim 2
Dependent Claim
81 words
In a process for the photopolymerization of unsat-urated polyester resins by exposing the said resins to light radia-tions in the presence of light-sensitive initiators, the improvement comprising: putting the surface of said resin at least partly in direct contact with a liquid medium which is immiscible with said resin and transparent to the radiations which are appropriate to the initiator used, said liquid medium acting as a heat exchange medium; and carrying out the photopolymerization of said resin through said medium.
Claim 3
Dependent Claim
34 words
Process according to claim 1 in which the unsaturated polyester resin consists essentially of a polycondensate of unsaturated diacids or anhyDrides with diols diluted with 20-70 percent by weight of a polymerizable ethylenic monomer.
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |