US4212952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N,N,N',N'-Tetramethyl-αω-polymethlenediamines as catalysts for the preparation of urethane foams
Assignee: Union Carbide Corp
•
Filing: 1978-12-21
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Granted: 1980-07-15
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Expires: 1998-12-21
Abstract
Abstract A process for preparation of a urethane foam which comprises reacting an aromatic polyisocyanate with a polyol in the presence of a blowing agent and a catalytic amount of a compound of the formula (CH.sub.3).sub.2 NCH.sub.2 CH.sub.2 (CH.sub.2).sub.n CH.sub.2 CH.sub.2 N(CH 3 ) 2 wherein n is 4, 3, 2, 1, or 0.
Inventors
- 👤 Gerald J. Murphy
- 👤 Bernard Kanner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:41
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/1808
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
77 words
In the process for the preparation of a urethane foam which comprises reacting an aromatic polyisocyanate with polyol in the presence of a catalyst and a blowing agent, the improvement which comprises conducting the reaction in the presence of a catalytic amount of an N,N,N40 ,N'-tetramethyl-α,ω-polymethylenediamine compound of the formula (CH 3 ) 2 NCH 2 (CH 2 ) n CH 2 CH 2 N(CH 3 ) 2 wherein n is 4, 3, 2, 1, or 0.
Claim 2
Dependent Claim
77 words
In the process for the preparation of a urethane foam which comprises reacting an aromatic polyisocyanate with polyol in the presence of a catalyst and a blowing agent, the improvement which comprises conducting the reaction in the presence of a catalytic amount of an N,N,N40 ,N'-tetramethyl-α,ω-polymethylenediamine compound of the formula (CH 3 ) 2 NCH 2 (CH 2 ) n CH 2 CH 2 N(CH 3 ) 2 wherein n is 4, 3, 2, 1, or 0.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein the N,N,N',N'-tetramethyl-α,ω-polymethylenediamine compound is present in an amount of from 0.1 to 3.0 parts by weight per 100.0 parts by weight of polyol.
Claim 4
Dependent Claim
14 words
A process of claim 1 wherein the urethane foam produced is a flexible foam.
Claim 5
Dependent Claim
27 words
A process of claim 3 wherein the aromatic polyisocyanate is tolylene diisocyanate and the polyol is a polyoxyalkylene polyol having a hydroxyl number of up to 70.
Claim 6
Dependent Claim
17 words
A process of claim 4 wherein there is present a tin gelation catalyst and a silicone surfactant.
Claim 7
Dependent Claim
31 words
A process of claim 5 wherein the N,N,N',N'-tetramethyl-α,ω-polymethylenediamine compound is present in an amount of from 0.1 to 3.0 parts by weight per 100.0 parts by weight of the polyoxyalkylene polyol.
Claim 8
Dependent Claim
14 words
A process of claim 1 wherein the urethane foam produced is a rigid foam.
Claim 9
Dependent Claim
26 words
A process of claim 7 wherein the aromatic polyisocyanate is a polymethylenepoly(phenyleneisocyanate) and the polyol is a polyoxyalkylene polyol having a hydroxyl number greater than 150.
Claim 10
Dependent Claim
12 words
A process of claim 8 wherein there is present a silicone surfactant.
Claim 11
Dependent Claim
31 words
A process of claim 9 wherein the N,N,N',N'-tetramethyl-α,ω-polymethylenediamine compound is present in an amount of from 0.1 to 3.0 parts by weight per 100.0 parts by weight of the polyoxyalkylene polyol.
Claim 12
Dependent Claim
15 words
A process according to any one of claims 1-10 wherein the N,N,N',N'-tetramethyl-α,ω-polymethylenediamine compound is N,N,N',N'-tetramethyl-1,6-hexanediamine.
References Cited (Backward Citations)
GB1403569A
Cited
US4033911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |