Patent US4219931A successfully refreshed from Google Patents.
Patent US4150207A successfully refreshed from Google Patents.
US4150207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina trihydrate as flame retardant agent for urethane-modified carbodiimide-isocyanurate foams
Assignee: BASF Corp
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Filing: 1977-06-13
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Granted: 1979-04-17
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Expires: 1997-06-13
Abstract
Abstract Urethane-modified carbodiimide-isocyanurate foams are prepared by catalytically condensing (a) an organic polyisocyanate with a polyol or (b) a quasi-prepolymer in the presence of a blowing agent and from 20 parts to 100 parts by weight of alumina trihydrate. The resulting foams are characterized by improved flame retardancy without loss in strength properties.
Inventors
- 👤 Moses Cenker
- 👤 Thirumurti Narayan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:39
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08J2379/00; Y; Y10; Y10S; Y10S521/00; Y10S521/901; Y10S521/902; Y10S521/906
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
67 words
A urethane-modified carbodiimide-isocyanurate foam prepared by condensing (a) an organic polyisocyanate with a polyol or (b) an isocyanate-terminated quasi-prepolymer in the presence of ( 1) a catalytically sufficient amount of a catalyst system which promotes the carbodimide and isocyanurate reactions, (2) a blowing agent and (3) from 20 parts to 100 parts by weight based on 100 parts by weight of (a) or (b) of alumina trihydrate.
Claim 2
Dependent Claim
67 words
A urethane-modified carbodiimide-isocyanurate foam prepared by condensing (a) an organic polyisocyanate with a polyol or (b) an isocyanate-terminated quasi-prepolymer in the presence of ( 1) a catalytically sufficient amount of a catalyst system which promotes the carbodimide and isocyanurate reactions, (2) a blowing agent and (3) from 20 parts to 100 parts by weight based on 100 parts by weight of (a) or (b) of alumina trihydrate.
Claim 3
Dependent Claim
11 words
The foam of claim 1 wherein (a) is crude diphenylmethane diisocyanate.
Claim 4
Dependent Claim
17 words
The foam of claim 1 wherein the polyol is an ethylene oxide adduct of a polyhydric alcohol.
Claim 5
Dependent Claim
14 words
The foam of claim 3 wherein the polyhydric alcohol is ethylene glycol or trimethylolpropane.
Claim 6
Dependent Claim
16 words
The foam of claim 1 wherein the compound which promotes the carbodiimide reaction is furfuryl alcohol.
Claim 7
Dependent Claim
15 words
The foam of claim 1 wherein the compound which promotes the isocyanurate reaction is 1,3,5-tris-(N,N-dimethylaminopropyl)hexahydrotriazine.
Claim 8
Dependent Claim
17 words
The foam of claim 1 prepared in the presence of a catalyst which promotes the urethane reaction.
Claim 9
Dependent Claim
11 words
The foam of claim 1 wherein the catalyst is dibutyltin diacetate.
Claim 10
Dependent Claim
14 words
The foam of claim 1 prepared in the presence of a halocarbon blowing agent.
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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) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |