Patent US4421869A successfully refreshed from Google Patents.
US4421869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for making polyurethanes
Assignee: Air Products and Chemicals Inc
•
Filing: 1982-10-21
•
Granted: 1983-12-20
•
Expires: 2002-10-21
Abstract
Abstract Polyurethane foams with excellent physical properties can be obtained by using a partial salt between N,N-dimethylaminopropane-1,3-diamine (DMAPA) and phenol.
Inventors
- 👤 Francis W. Arbir
- 👤 Daniel S. Raden
- 👤 Kenneth W. Narducy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:23
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/1825
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
59 words
The process of preparing a polyurethane foam from a polyisocyanate and a polyol in the presence of a blowing agent, consisting essentially in carrying out the reaction in the presence of a catalytically effective amount of a partially blocked DMAPA, said partial blocking being caused by the inclusion of phenol in the molar amount of 10-50% of said DMAPA.
Claim 2
Dependent Claim
59 words
The process of preparing a polyurethane foam from a polyisocyanate and a polyol in the presence of a blowing agent, consisting essentially in carrying out the reaction in the presence of a catalytically effective amount of a partially blocked DMAPA, said partial blocking being caused by the inclusion of phenol in the molar amount of 10-50% of said DMAPA.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein said effective amount is 0.1 to 0.3% of said polyol.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein said partially blocked DMAPA is dissolved in DPG.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein said process is carried out in the presence of a catalytically sufficient amount of a divalent tin compound.
References Cited (Backward Citations)
US4303755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |