US4552903A
Expired / Lapsed
US
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Flexible polyurethane foams prepared from cotrimers of alkylene-bridged polyphenylene polyisocyanates
Assignee: Dow Chemical Co
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Filing: 1984-12-24
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Granted: 1985-11-12
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Expires: 2004-12-24
Abstract
Abstract Flexible polyurethane foams having improved flame resistance and "guide factor" are prepared by reacting a copolymer polyahl, isocyanate-terminated prepolymer containing a cotrimer of MDI and a blowing agent.
Inventors
- 👤 John L. Nafziger
- 👤 Mark A. Snyder
- 👤 Larry W. Mobley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:03
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/04; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/63; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/791
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
68 words
A flexible polyurethane foam comprising the reaction product of a reaction mixture comprising: (a) a dispersion of polymer particles in a continuous polyahl phase which continuous phase comprises a relatively high equivalent weight polyahl, (b) an isocyanate-terminated prepolymer containing dissolved or dispersed therein a plurality of isocyanurate groups formed by the trimerization of an alkylene-bridged polyphenylene polyisocyanate and at least one other polyisocyanate and (c) a blowing agent.
Claim 2
Dependent Claim
68 words
A flexible polyurethane foam comprising the reaction product of a reaction mixture comprising: (a) a dispersion of polymer particles in a continuous polyahl phase which continuous phase comprises a relatively high equivalent weight polyahl, (b) an isocyanate-terminated prepolymer containing dissolved or dispersed therein a plurality of isocyanurate groups formed by the trimerization of an alkylene-bridged polyphenylene polyisocyanate and at least one other polyisocyanate and (c) a blowing agent.
Claim 3
Dependent Claim
13 words
The foam of claim 1 wherein said other polyisocyanate is an aromatic polyisocyanate.
Claim 4
Dependent Claim
18 words
The foam of claim 1 wherein said alkylenebridged polyphenylene polyisocyanate has a functionality of 2.0 or about 2.6-3.0.
Claim 5
Dependent Claim
20 words
The foam of claim 1 wherein said prepolymer comprises the reaction product of a polyisocyanate and a short chain diol.
Claim 6
Dependent Claim
19 words
The foam of claim 4 wherein said short chain diol comprises from about 1-10% by weight of the prepolymer.
Claim 7
Dependent Claim
14 words
The foam of claim 5 wherein said cotrimer is chemically bonded to said prepolymer.
Claim 8
Dependent Claim
60 words
The foam of claim 6 wherein said prepolymer is prepared by reacting a polyisocyanate which is not a alkylene-bridged polyphenylene polyisocyanate with a short chain diol to form a first prepolymer, then reacting said first prepolymer with a alkylene-bridged polyphenylene polyisocyanate for form a cotrimer, and then reacting said cotrimer with a short chain diol to form an isocyanate-terminated prepolymer.
Claim 9
Dependent Claim
19 words
The foam of claim 1 wherein the polymer particles dispersed in said continuous polyahl phase comprise an addition polymer.
Claim 10
Dependent Claim
16 words
The foam of claim 7 wherein the other polyisocyanate is 2,4-TDI, 2,6-TDI or a mixture thereof.
Claim 11
Dependent Claim
25 words
The foam of claim 1 wherein the reaction mixture further comprises a surfactant, and a catalyst for the reaction of the polyahl and the prepolymer.
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) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |