US3941726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyguanidine foams
Assignee: Bayer AG
•
Filing: 1974-04-02
•
Granted: 1976-03-02
•
Expires: 1994-04-02
Abstract
Abstract A polyguanidine foam is prepared by reacting an amine or ammonia with a polycarbodiimide foam which has been prepared from a reaction mixture containing an addition product of an alcohol and a phospholine oxide or sulphide. The novel foam may be used for heat insulation or as an absorbent material.
Inventors
- 👤 Rolf Wiedermann
- 👤 Andrea La Spina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:13
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08G18/0809; C08G18/28; C08G18/40; C08G18/63; C08G18/632; C08G18/83; C08G73/00; C08G2110/00; C08G2110/0041; C08J2379/00; Y; Y10; Y10S; Y10S521/00; Y10S521/901; Y10S525/00; Y10S525/907
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
25 words
A process for producing a polyguanidine foam which comprises reacting a solid polycarbodiimide foam with a fluid containing a primary or secondary amine or ammonia.
Claim 2
Dependent Claim
25 words
A process for producing a polyguanidine foam which comprises reacting a solid polycarbodiimide foam with a fluid containing a primary or secondary amine or ammonia.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the polycarbodiimide foam was prepared with an aromatic polyisocyanate.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the amine is a primary or secondary amine containing from 1 to 5 amino groups.
Claim 5
Dependent Claim
16 words
The process according to claim 1 wherein a primary amine is reacted with the polycarbodiimide foam.
Claim 6
Independent Claim
77 words
A method of making polyguanidine foam which comprises contacting a carbodiimide foam with a fluid containing hydrazine, ammonia or a primary or secondary amine, said polycarbodiimide foam having been prepared from a reaction mixture containing an organic polyisocyanate, addition product of phospholine oxide or sulfide and an alcohol or a protonic acid which in a N/10 aqueous solution has a pH of 1 to 8, a metal salt or an acid chloride and optionally a blowing agent.
Claim 7
Independent Claim
77 words
A method of making polyguanidine foam which comprises contacting a carbodiimide foam with a fluid containing hydrazine, ammonia or a primary or secondary amine, said polycarbodiimide foam having been prepared from a reaction mixture containing an organic polyisocyanate, addition product of phospholine oxide or sulfide and an alcohol or a protonic acid which in a N/10 aqueous solution has a pH of 1 to 8, a metal salt or an acid chloride and optionally a blowing agent.
References Cited (Backward Citations)
US2941966A
Cited
US2941983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |