US4021385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane foams resistant to discoloration
Assignee: BASF Corp
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Filing: 1974-12-30
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Granted: 1977-05-03
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Expires: 1994-12-30
Abstract
Abstract Polyether polyols may be synergistically stabilized against oxidation by incorporating therewith 4,4'-bis(alphadimethylbenzyl) diphenyl amine and a 2,6-di-t-butyl-4-(lower alkyl) phenol such as 2,6-di-t-butyl-4-methyl phenol or 2,6-di-t-butyl-4-butyl phenol. The stabilized polyols inhibit color formation when employed in the preparation of polyurethane foams.
Inventors
- 👤 Arthur L. Austin
- 👤 William W. Levis, Jr.
- 👤 John T. Patton, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:13
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08G; C08G18/00; C08G18/06; C08G18/28; C08K5/16; C08K5/17; C08K5/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
106 words
A polyurethane foam prepared by the reaction of an organic polyisocyanate with a polyether polyol in the presence of a blowing agent, said polyether polyol being a condensation product of an alkylene oxide or mixture of alkylene oxide and a polyhydric alcohol, said product being stabilized against oxidation with from about 0.05 to 0.5 parts by weight of said product of a combination of 4,4'-bis(alphadimethylbenzyl) diphenylamine and a compound of the formula ##STR8## where R is an alkyl of 1 to 9 carbon atoms, said combination containing 10 weight percent or more of each of said amine and said compound, taking said combination as 100 percent.
Claim 2
Dependent Claim
106 words
A polyurethane foam prepared by the reaction of an organic polyisocyanate with a polyether polyol in the presence of a blowing agent, said polyether polyol being a condensation product of an alkylene oxide or mixture of alkylene oxide and a polyhydric alcohol, said product being stabilized against oxidation with from about 0.05 to 0.5 parts by weight of said product of a combination of 4,4'-bis(alphadimethylbenzyl) diphenylamine and a compound of the formula ##STR8## where R is an alkyl of 1 to 9 carbon atoms, said combination containing 10 weight percent or more of each of said amine and said compound, taking said combination as 100 percent.
Claim 3
Dependent Claim
9 words
The foam of claim 1 where R is methyl.
Claim 4
Dependent Claim
9 words
The foam of claim 1 where R is butyl.
Claim 5
Dependent Claim
20 words
The foam of claim 1 wherein the polyether polyol is a condensation product of propylene oxide and a polyhydric alcohol.
Claim 6
Dependent Claim
21 words
The foam of claim 4 wherein the polyhydric alcohol is selected from the group consisting of glycerol, trimethylolpropane and propylene glycol.
Claim 7
Dependent Claim
9 words
The foam of claim 5 where R is methyl.
Claim 8
Dependent Claim
9 words
The foam of claim 5 where R is butyl.
Claim 9
Dependent Claim
26 words
The foam of claim 1 wherein the condensation product is stabilized with from 0.1 to 0.2 parts of the combination per 100 parts of condensation product.
Claim 10
Dependent Claim
9 words
The foam of claim 8 where R is methyl.
Claim 11
Dependent Claim
9 words
The foam of claim 8 where R is butyl.
References Cited (Backward Citations)
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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) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |