US3676376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low flame spread polyurethane foam containing bromine-containing polyester resin
Assignee: Freeman Chemical Corp
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Filing: 1971-01-04
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Granted: 1972-07-11
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Expires: 1991-01-04
Abstract
Abstract A low-flame spread rating polyurethane foam includes as one of its polyol ingredients saturated polyester composition of low acid value having 20 to 30 percent bromine by weight and an -OH value of 350-550 formed from A. TETRABROMOPHTHALIC ANHYDRIDE OR ACID; B. AN ALIPHATIC DICARBOXYLIC ACID; C. A POLYOL; D. AN ALIPHATIC DIOL. The polyester preferably has a viscosity less than 500,000 centipoises at 25* C. In such low-flame spread forms, the polyester is combined with prepolymers of a polyether polyol and a polyisocyanate, preferably polymethylene polypehnylene polyisocyanate.
Inventors
- 👤 Glenn R Svoboda
- 👤 Ronald W Reineck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:35
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/46; C08G18/4607
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
21 words
The polyurethane foam of claim 1 wherein the said polyester has a viscosity of less than 500,000 centipoises at 25* C.
Claim 2
Dependent Claim
15 words
The polyurethane foam of claim 1 wherein the said aliphatic dicarboxylic acid is adipic acid.
Claim 3
Dependent Claim
14 words
The polyurethane foam of claim 1 wherein the said diol is 1, 6-hexane diol.
Claim 4
Dependent Claim
13 words
The polyurethane foam of claim 1 wherein the said polyol is a triol.
Claim 5
Dependent Claim
37 words
The polyurethane of claim 1 wherein the said polyester comprises the polyesterification reaction product of 10-15 mols of trimethylol propane; 1-2 mols of 1,6-hexane diol; 4-5 mols of adipic acid; 2.5-3 mols of tetrabromophthalic acid or anhydride.
Claim 6
Dependent Claim
17 words
The polyurethane foam of claim 1 wherein the said polyester has an acid value less than 2.
Claim 7
Dependent Claim
22 words
The polyurethane foam of claim 1 wherein the said polyisocyanate is a prepolymer formed by reacting polymethylene polyphenylene polyisocyanate with polyether polyol.
Claim 8
Dependent Claim
19 words
The polyurethane foam of claim 8 wherein the said polyether polyol is the alkylene oxide adduct of methyl glucoside.
Claim 9
Dependent Claim
19 words
The polyurethane foam of claim 1 having a flame spread index less than 25 in the ASTM E-84 test.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |