Patent US4162242A successfully refreshed from Google Patents.
US4162242A
Expired / Lapsed
US
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Polyol stabilization additive for polypyrrolidone
Assignee: Chevron USA Inc
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Filing: 1978-05-24
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Granted: 1979-07-24
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Expires: 1998-05-24
Abstract
Abstract Certain polyhydric alcohols are thermal stabilization additives for normally solid polypyrrolidone at melt temperatures.
Inventors
- 👤 Ralph House
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:49
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/05; C08K5/053
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
30 words
A composition of matter comprising a major amount of normally solid poly-2-pyrrolidone and 0.1-5 weight percent of a polyhydric alcohol having a boiling point of about 200°-300° C. or greater.
Claim 2
Dependent Claim
30 words
A composition of matter comprising a major amount of normally solid poly-2-pyrrolidone and 0.1-5 weight percent of a polyhydric alcohol having a boiling point of about 200°-300° C. or greater.
Claim 3
Dependent Claim
17 words
A composition according to claim 1 containing less than about 3 weight percent of said polyhydric alcohol.
Claim 4
Dependent Claim
14 words
A composition according to claim 1 wherein said polyhydric alcohol is a polyhydric alkanol.
Claim 5
Dependent Claim
29 words
A composition according to claim 1 wherein said polyhydric alcohol is a polyhydric alkanol having an equivalent weight with respect to the hydroxyl function of about 100 or less.
Claim 6
Dependent Claim
21 words
A composition according to claim 1 wherein said polyhydric alcohol is selected from the group consisting of trimethylolethane, pentaerythritol, and 1,5-dihydroxy-3-thiapentane.
Claim 7
Dependent Claim
18 words
A composition according to claim 1 wherein said polyhydric alcohol is a C 3 -C 12 polyhydric alkanol.
Claim 8
Dependent Claim
18 words
A composition according to claim 1 wherein said polyhydric alcohol is a C 4 -C 6 polyhydric alkanol.
Claim 9
Independent Claim
44 words
A method of melt extruding normally solid poly-2-pyrrolidone which comprises admixing about 5 weight percent of a polyhydric alcohol having a boiling point of about 200°-300° C. or greater, and extruding said mixture at a melt temperature in the range of about 260°-280° C.
Claim 10
Independent Claim
44 words
A method of melt extruding normally solid poly-2-pyrrolidone which comprises admixing about 5 weight percent of a polyhydric alcohol having a boiling point of about 200°-300° C. or greater, and extruding said mixture at a melt temperature in the range of about 260°-280° C.
Claim 11
Dependent Claim
18 words
The method of claim 8 wherein said mixture is extruded at a melt temperature of about 260°-275° C.
Claim 12
Dependent Claim
17 words
The method of claim 8 wherein said mixture is extruded at melt temperature of about 260°-270° C.
Claim 13
Dependent Claim
33 words
A composition of matter according to claim 1 wherein said polyhydric alcohol has a boiling point of about 250°-300° C. or greater and is present in an amount of about 0.5-3 weight percent.
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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) | 1982-07-23 | 1983-01-22 | 1983-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-23 | 1987-01-22 | 1987-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-23 | 1991-01-22 | 1991-07-24 | $7700.00 | Window Closed / Lapsed |