US3620987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polymer foam
Assignee: Pharmacia and Upjohn Co
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Filing: 1969-11-21
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Granted: 1971-11-16
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Expires: 1989-11-21
Abstract
Abstract High temperature resistant cellular polymers are prepared in a one-shot procedure by reacting a polycarboxylic acid or polycarboxylic anhydride with an organic polyisocyanate in the presence of a catalyst combination comprising a tertiary amine, an aliphatic alcohol (C1-C6), and optionally, a monomeric homocyclic polyepoxide. The use of the latter catalyst system not only increases the rate of foam formation but permits foam formation to be initiated at ambient temperature without the need to supply external heat to the reaction mixture before or after the reactants are brought together. This permits pouring-in-place of the foam forming system, for example, in the insulation of cavity walls for construction purposes, in trailer walls, and in cold storage frameworks and the like.
Inventors
- 👤 Alexander M Mclaughlin
- 👤 James S Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:16
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/28; C08G18/30; C08G18/34; C08G69/00; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1035
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
16 words
A process acCording to claim 1 wherein the catalyst combination also comprises a monomeric homocyclic polyepoxide.
Claim 2
Dependent Claim
40 words
A process according to claim 1 wherein the catalyst combination also comprises a monomeric homocyclic polyepoxide selected from the class consisting of a polyhydric mononuclear phenol, a polyhydric fused ring phenol, and a nonfused polynuclear polyhydric phenol having the formula:
Claim 3
Dependent Claim
30 words
A process according to claim 1 wherein the tertiary amine employed as catalyst is selected from the class consisting of triethylene diamine, N,N'',N''''-trialkylaminoalkyl-hexahydrotriazine, a mono(dialkylaminoalkyl)phenol, a 2,4,6-tri(dialkylaminoalkyl)phenol and mixtures thereof.
Claim 4
Dependent Claim
12 words
A process according to claim 1 wherein the aliphatic alcohol is methanol.
Claim 5
Dependent Claim
27 words
A process according to claim 1 wherein the polyisocyanate is employed in an amount corresponding to about 0.6 to about 2 equivalents per equivalent of polycarboxylic derivative.
Claim 6
Dependent Claim
27 words
A process according to claim 1 wherein the polyisocyanate is a polymethylene polyphenyl polyisocyanate containing from about 35 to about 85 percent by weight of methylenebis(phenyl isocyanate).
Claim 7
Dependent Claim
22 words
A process according to claim 1 wherein the polycarboxylic derivative is selected from the class consisting of anhydrides having the following formulae:
Claim 8
Dependent Claim
47 words
A process for the preparation of a cellular polymer containing recurring imide linkages in the molecular chain thereof, said process comprising reacting polymethylene polyphenyl polyisocyanate and 3,3'',4,4''-benzophenone tetracarboxylic acid dianhydride in the presence of a catalyst combination comprising methanol, a monomeric homocyclic polyepoxide, triethylene diamine, and N,N'',N''''-tris(dialkylaminoalkyl)-s-hexahydrotriazine.
Claim 9
Dependent Claim
13 words
The process of claim 9 wherein said polyepoxide is an epoxy novolac resin.
Claim 10
Dependent Claim
12 words
The process of claim 9 wherein said N,N'' ,N''''-tris(dialkylaminoalkyl)-s-hexahydrotriazine is N,N'' ,N''''-tris(dimethylaminopropyl)-s-hexahydrotriazine.
Claim 11
Dependent Claim
46 words
A process for the preparation of a cellular polymer containing recurring imide linkages in the molecular chain thereof, said process comprising reacting polymethylene polyphenyl polyisocyanate and trimellitic anhydride in the presence of a catalyst combination comprising methanol, a monomeric homocyclic polyepoxide, triethylene diamine, and N,N'', N''''-tris(dialkylaminoalkyl)-s-hexahydrotriazine.
Claim 12
Dependent Claim
13 words
The process of claim 12 wherein said polyepoxide is an epoxy novolac resin.
Claim 13
Dependent Claim
11 words
The process of claim 12 wherein said N,N'' ,N''''-tris(dialkylaminoalkyl)-s-hexahydrotriazine is N,N'',N''''-tris(dimethylaminopropyl)-s-hexahydrotriazine.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |