Patent US1864858A successfully refreshed from Google Patents.
Patent US3943075A successfully refreshed from Google Patents.
US3943075A
Expired / Lapsed
US
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Polyurethane foams
Assignee: Dunlop Holdings Ltd
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Filing: 1973-10-29
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Granted: 1976-03-09
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Expires: 1993-10-29
Abstract
Abstract Flame-resistant polyurethane foams are obtained by a process in which a tolylene diisocyanate (T.D.I.) is reacted with a polymeric polyol in the presence of a substance which is normally effective for the polymerisation of T.D.I. and an anti-ageing additive such as a halogenated aliphatic phosphate, of which the following is a specification.
Inventors
- 👤 John Fishbein
- 👤 Raymond William Henry Bell
- 👤 Anthony James Clarke
- 👤 Peter Merriman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:12
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/09; C08G18/092; C08G18/28; C08G18/40; C08G18/48; C08G18/4804; C08G18/4833; C08G18/4837; C08G18/4841; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G18/6677; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/005; C08G2110/0058; C08G2110/0083; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
184 words
A flexible flame-retardant polyurethane foam prepared by the process which comprises reacting a tolylene diisocyanate with a polyalkylene ether polyol having from 20 to 70% primary hydroxyl groups in a foam forming reaction mixture having an isocyanate index of less than 150 and containing (a) a compound which promotes trimerization of tolylene diisocyanate, (b) an amount of a compound containing labile halogen which inhibits heat aging of the foam caused by said trimerization promotor, and (c) a blowing agent, said polyalkylene ether polyol having a reactivity such that said reaction mixture, in the absence of special measures to the contrary, produces a closed cell foam; and said reaction mixture contains an additional polyol which is different in its constitution from said polyalkylene ether polyol and which is a polyethylene ether glycol or a poly(oxyethylene) poly(oxypropylene glycol) wherein the poly(oxypropylene) content has a molecular weight of 500 to 2000 and wherein from 20 to 80% of its weight is oxyethylene groups at least some of which are in non-terminal positions, and said additional polyol is from 2 to 40% by weight of the total polyol.
Claim 2
Dependent Claim
184 words
A flexible flame-retardant polyurethane foam prepared by the process which comprises reacting a tolylene diisocyanate with a polyalkylene ether polyol having from 20 to 70% primary hydroxyl groups in a foam forming reaction mixture having an isocyanate index of less than 150 and containing (a) a compound which promotes trimerization of tolylene diisocyanate, (b) an amount of a compound containing labile halogen which inhibits heat aging of the foam caused by said trimerization promotor, and (c) a blowing agent, said polyalkylene ether polyol having a reactivity such that said reaction mixture, in the absence of special measures to the contrary, produces a closed cell foam; and said reaction mixture contains an additional polyol which is different in its constitution from said polyalkylene ether polyol and which is a polyethylene ether glycol or a poly(oxyethylene) poly(oxypropylene glycol) wherein the poly(oxypropylene) content has a molecular weight of 500 to 2000 and wherein from 20 to 80% of its weight is oxyethylene groups at least some of which are in non-terminal positions, and said additional polyol is from 2 to 40% by weight of the total polyol.
Claim 3
Dependent Claim
29 words
A product according to claim 1 in which the polyol is a triol and the primary hydroxyl groups comprise 40 to 70% of the total number of hydroxyl groups.
Claim 4
Dependent Claim
25 words
A product according to claim 1 in which the polyol is a poly(oxyethylene) poly(oxypropylene) triol having a poly(oxyethylene) content of up to 20% by weight.
Claim 5
Dependent Claim
25 words
The product of claim 1 wherein the said mixture contains 0.5 to 4 parts of labile halogen containing compound per 100 parts polyalkylene ether polyol.
Claim 6
Dependent Claim
17 words
The product of claim 1 wherein the labile halogen containing compound is a halogenated aliphatic phosphate ester.
Claim 7
Dependent Claim
17 words
The product of claim 1 wherein the polyol is a polyalkylene ether glycol or polyalkylene ether triol.
Claim 8
Dependent Claim
17 words
The product of claim 1, wherein the labile halogen containing compound is a halogenated aliphatic phosphate ester.
Claim 9
Dependent Claim
20 words
The product of claim 7, wherein the labile halogen containing compound is a chloro- or bromo-derivative of a trialkyl ortho-phosphate.
Claim 10
Dependent Claim
15 words
The product of claim 8, wherein the labile halogen containing compound is tris 2,3-dibromopropyl orthophosphate.
Claim 11
Dependent Claim
28 words
The product of claim 8, wherein the labile halogen containing compound is tris bromopropyl phosphate, tris chloropropyl phosphate, tris bromoethyl phosphate, tris chloroethyl phosphate or tris 2,3-dichloropropyl phosphate.
Claim 12
Dependent Claim
21 words
The product of claim 1, wherein the labile halogen containing compound is a halogenated aliphatic hydrocarbon or a halogenated aromatic hydrocarbon.
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) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |