US3673128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellular polyoxazolidinone elastomers from polyisocyanates and polyepoxides
Assignee: Pharmacia and Upjohn Co
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Filing: 1968-04-08
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Granted: 1972-06-27
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Expires: 1988-04-08
Abstract
Abstract High temperature resistant, low flame spread cellular polymers are disclosed. These polymers are obtained by reacting an organic polyisocyanate and a polyepoxide in approximately stoichiometric proportions in the presence of a tertiary amine catalyst (triethylene diamine preferred) and a blowing agent. Non activehydrogen containing flame retardants, surfactants, pigments, and like additives can be incorporated into the cellular polymers of the invention. The novel cellular polymers are useful in thermal insulation and like applications where resistance to extreme temperatures and low flame spread requirements must be met.
Inventors
- 👤 Edward F Hayash Jr
- 👤 Harold E Reymore Jr
- 👤 Adnan A R Sayigh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:52
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4028; C08G18/00; C08G18/003; C08G2110/00; C08G2110/0041; Y; Y10; Y10S; Y10S521/00; Y10S521/906
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
18 words
A high temperature resistant cellular polymer according to claim 1 in which the tertiary amine catalyst is triethylene-diamine.
Claim 2
Dependent Claim
18 words
a polyepoxide in a proportion of from about 0.70 equivalent to about 1.25 equivalents per equivalent of polyisocyanate;
Claim 3
Dependent Claim
5 words
a tertiary amine catalyst; and
Claim 4
Dependent Claim
47 words
A high temperature resistant cellular polymer according to claim 1 in which the organic polyisocyanate is a polymethylene polyphenyl isocyanate containing from about 35 to about 85 percent by weight of methylenebis(phenyl isocyanate) the remainder of said mixture being polymethylene polyphenyl isocyanate of functionality greater than 2.0.
Claim 5
Dependent Claim
43 words
A high temperature resistant cellular polymer according to claim 1 in which the organic polyisocyanate is a polymethylene polyphenyl isocyanate containing about 50 percent by weight of methylenebis(phenyl isocyanate) the remainder of said mixture being polymethylene polyphenyl isocyanate of functionality greater than 2.0.
Claim 6
Dependent Claim
3 words
a blowing agent.
Claim 7
Dependent Claim
27 words
A high temperature resistant cellular polymer according to claim 1 in which the polyepoxide is a diglycidyl ether of a non-fused polynuclear polyhydric phenol having the formula:
Claim 8
Dependent Claim
22 words
A high temperature resistant cellular polymer according to claim 1 in which the polyepoxide is the polyglycidyl ether of a novolac resin.
Claim 9
Dependent Claim
39 words
A high temperature resistant cellular polymer according to claim 1 in which the polyepoxide is a compound of the formula: wherein n is an integer of from 1 to 3 and R3 is an aromatic residue of valency n.
Claim 10
Dependent Claim
45 words
A high temperature resistant cellular polymer according to claim 1 in which the blowing agent is selected from the group consisting of water, a halogenated aliphatic hydrocarbon having a boiling point within the range of about -20* C. to about 110* C., and mixtures thereof.
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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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |