US4623478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and method for making foamed polyester resin
Assignee: U S Peroxygen Corp
•
Filing: 1986-03-06
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Granted: 1986-11-18
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Expires: 2006-03-06
Abstract
Abstract A composition for foaming polyester which includes a carbonate or bicarbonate salt and water intermixed with a finely divided solid free flow agent such as synthetic amorphous silica. The free flow agent is added in an amount sufficient to absorb all of the water and render the composition a free flowing powder. The composition is readily mixable with an unsaturated polyester resin media. A source of acid in the mixture liberates gas from the carbonate or bicarbonate, and good foam structures having small uniform cells are obtained.
Inventors
- 👤 Ronald L. Pastorino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:16
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/08; C08J2367/00; C08J2367/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
46 words
A composition for use in foaming polyester resin at room temperature consisting of: a salt selected from sodium and potassium carbonates and bicarbonates; water; and intermixed therewith sufficient finely divided solid free flow agent to absorb said water and make the composition a free flowing powder.
Claim 2
Dependent Claim
46 words
A composition for use in foaming polyester resin at room temperature consisting of: a salt selected from sodium and potassium carbonates and bicarbonates; water; and intermixed therewith sufficient finely divided solid free flow agent to absorb said water and make the composition a free flowing powder.
Claim 3
Dependent Claim
23 words
A composition in accordance with claim 1, wherein said salt is initially dissolved in said water before intermixture with said free flow agent.
Claim 4
Dependent Claim
23 words
A composition in accordance with claim 2, wherein said salt is dissolved in said water in an amount sufficient to saturate the solution.
Claim 5
Dependent Claim
19 words
A composition in accordance with claim 3, wherein said salt is initially dissolved in said water at elevated temperature.
Claim 6
Dependent Claim
15 words
A composition in accordance with claim 4, wherein said elevated temperature is about 50°-90° C.
Claim 7
Dependent Claim
15 words
A composition in accordance with claim 4, wherein said elevated temperature is about 60°-70° C.
Claim 8
Dependent Claim
24 words
A composition in accordance with claims 2, 3 or 4, wherein said free flow agent is selected from natural and synthetic silicas and silicates.
Claim 9
Dependent Claim
13 words
A composition in accordance with claim 1, wherein said salt is potassium bicarbonate.
Claim 10
Dependent Claim
18 words
A composition in accordance with claim 1, wherein said salt and water are separately intermixed in said composition.
References Cited (Backward Citations)
GB652770A
Cited
US3479303A
Cited
US4016112A
Cited
US4119583A
Cited
GB2029834A
Cited
US4028289A
Cited
US4122047A
Cited
US4216294A
Cited
US4347331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |