US4255527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel blowing agent for polymeric foam process
Assignee: Individual
•
Filing: 1979-07-19
•
Granted: 1981-03-10
•
Expires: 1999-07-19
Abstract
Abstract A process is disclosed for a polymeric foam such as a polyurethane foam prepared from a reaction mixture comprising an organic polyisocyanate compound and a compound having more than one active hydrogen, wherein the blowing agent comprises a mixture of ethanol and dibutylphthalate. The molar ratio of ethanol to dibutylphthalate is preferably in the range of from about 1.5 to about 4.
Inventors
- 👤 Santanu Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:32
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/142; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
54 words
A blowing agent for a polymeric foam derived from a reaction mixture comprising an organic polyisocyanate compound and a compund having more than one active hydrogen, the blowing agent comprising a mixture of dibutylphthalate and ethanol, the molar ratio of ethanol to dibutylphthalate being in the range of from about 1.5 to about 4.
Claim 2
Dependent Claim
54 words
A blowing agent for a polymeric foam derived from a reaction mixture comprising an organic polyisocyanate compound and a compund having more than one active hydrogen, the blowing agent comprising a mixture of dibutylphthalate and ethanol, the molar ratio of ethanol to dibutylphthalate being in the range of from about 1.5 to about 4.
Claim 3
Independent Claim
60 words
A method of preparing a polymeric foam from a reaction mixture comprising an organic polyisocyanate compound and a compound having more than one active hydrogen, the method including mixing with the reaction mixture water and a blowing agent comprising ethanol and dibutylphthalate, the molar ratio of ethanol to dibutylphthalate being in the range of from about 1.5 to about 4.
Claim 4
Independent Claim
60 words
A method of preparing a polymeric foam from a reaction mixture comprising an organic polyisocyanate compound and a compound having more than one active hydrogen, the method including mixing with the reaction mixture water and a blowing agent comprising ethanol and dibutylphthalate, the molar ratio of ethanol to dibutylphthalate being in the range of from about 1.5 to about 4.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |