US3884844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming foamed polyester resins
Assignee: Individual
•
Filing: 1974-03-11
•
Granted: 1975-05-20
•
Expires: 1994-03-11
Abstract
Abstract Compositions of unsaturated polyester resin solutions formed by dissolving the condensation polymers of unsaturated dicarboxylic acids and dihydric alcohols in ethylenically unsaturated copolymerizable monomers may be foamed to give strong cured cellular structures by carrying out the copolymerization under subatmospheric pressure at a range of about 180 to 50 Torr, in the presence of blowing agents and a nucleating agent.
Inventors
- 👤 Mark Plunguian
- 👤 Charles E Cornwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:54
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08J9/04; C08J9/12; C08J9/14; C08K; C08K3/00; C08K3/02; C08K3/04; C08K3/08; C08K3/34; C08K3/36; C08L; C08L67/00; C08L67/06; C08L71/00; C08L71/02; C08J2367/00; C08J2367/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
67 words
A PROCESS FOR PRODUCING A CURED CELLULAR STRUCTURE IN A COMPOSITION COMPRISING (A) AN UNSATURATED POLYESTER FORMED BY CONDENSING AT LEAST ONE DICARBOXYLIC ACID CONTAINING A, B-ETHYLENIC UNSATURATION WITH A DIHYDRIC ALCOHOL, (B) AN A, B-ETHYLENICALLY UNSATURATED COPOLYMERIZABLE MONOMER, (C) A BLOWING AGENT, AND (D) A NUCLEATING AGENT, CHARACTERIZED BY CARRYING OUT THE COPOLYMERIZATION REACTION UNDER SUBATMOSPHERIC PRESSURE AT A RANGE OF ABOUT 180 TO 50 TORR.
Claim 2
Dependent Claim
67 words
A PROCESS FOR PRODUCING A CURED CELLULAR STRUCTURE IN A COMPOSITION COMPRISING (A) AN UNSATURATED POLYESTER FORMED BY CONDENSING AT LEAST ONE DICARBOXYLIC ACID CONTAINING A, B-ETHYLENIC UNSATURATION WITH A DIHYDRIC ALCOHOL, (B) AN A, B-ETHYLENICALLY UNSATURATED COPOLYMERIZABLE MONOMER, (C) A BLOWING AGENT, AND (D) A NUCLEATING AGENT, CHARACTERIZED BY CARRYING OUT THE COPOLYMERIZATION REACTION UNDER SUBATMOSPHERIC PRESSURE AT A RANGE OF ABOUT 180 TO 50 TORR.
Claim 3
Dependent Claim
17 words
The process according to claim 1 in which a polyoxyethylene sorbitan monooleate is used as a surfactant.
Claim 4
Dependent Claim
16 words
The process according to claim 1 in which aluminum powder flake is used as nucleating agent.
Claim 5
Dependent Claim
16 words
The process according to claim 1 in which fumed silica is used as a nucleating agent.
Claim 6
Dependent Claim
17 words
The process and product according to claim 1 in which fly ash is used as a filler.
Claim 7
Dependent Claim
16 words
The process according to claim 1 in which water is used along with the blowing agent.
References Cited (Backward Citations)
US3230184A
Cited
US3252923A
Cited
US3232893A
Cited
US3227665A
Cited
US3260688A
Cited
US3367890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |