Patent US4356330A successfully refreshed from Google Patents.
US4356330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of decolorizing mixtures of T-butyl alkylphenols with N-(2-hydroxyethyl)oxazolidine
Assignee: Texaco Inc
•
Filing: 1981-07-20
•
Granted: 1982-10-26
•
Expires: 2001-07-20
Abstract
Abstract A method of eliminating color-causing impurities in mixtures of t-butyl alkylphenols by treatment with N-(2-hydroxyethyl)oxazolidine at 90° C. and at atmospheric pressure is described. These phenols are used as peroxide inhibitors in polyoxyalkylene glycols for polyurethane foams. Discoloration of the polyol occurs if the phenol mixture is not treated with N-(2-hydroxyethyl)oxazolidine. The t-butyl alkylphenol mixture is derived from an alkylphenol made over an acid catalyst.
Inventors
- 👤 Michael Cuscurida
- 👤 George P. Speranza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:44
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/86
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
48 words
A method for removal of color-forming bodies from a mixture of t-butyl nonylphenols derived by reacting isobutylene with nonylphenol comprising reacting the mixture with N-(2-hydroxyethyl) oxazolidine in proportions of 1 to 5 weight percent of the mixture at a temperature in the range of 25° to 150° C.
Claim 2
Independent Claim
48 words
A method for removal of color-forming bodies from a mixture of t-butyl nonylphenols derived by reacting isobutylene with nonylphenol comprising reacting the mixture with N-(2-hydroxyethyl) oxazolidine in proportions of 1 to 5 weight percent of the mixture at a temperature in the range of 25° to 150° C.
Claim 3
Dependent Claim
17 words
The method of claim 1 in which the mixture to be reacted with N-(2-hydroxyethyl)oxazolidine contains 6-t-butyl nonylphenol.
Claim 4
Dependent Claim
18 words
The method of claim 1 or 2 in which the reaction temperature is about 88° to 90° C.
References Cited (Backward Citations)
GB807901A
Cited
GB807736A
Cited
GB919428A
Cited
DE1160860B
Cited
DE1157236B
Cited
US3375284A
Cited
US3369024A
Cited
US3306938A
Cited
US3546302A
Cited
NL6516378A
Cited
US3437699A
Cited
FR1502518A
Cited
US3454654A
Cited
US3660317A
Cited
FR1597867A
Cited
US3687999A
Cited
US3723529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |