US5159058A
Expired / Lapsed
US
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Polyglutarimides with improved properties
Assignee: Rohm and Haas Co
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Filing: 1992-04-16
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Granted: 1992-10-27
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Expires: 2012-04-16
Abstract
Abstract Polyglutarimides exhibit improved optical properties, as well as lowered content of non-aqueous volatiles, when the molten polyglutarimide is mixed with water, methanol, ethanol, or mixtures thereof, and the water, methanol, ethanol, or mixtures thereof is removed prior to isolation and processing of the polyglutarimide.
Inventors
- 👤 Robert E. Jerman
- 👤 William T. Freed
- 👤 Leslie A. Cohen
- 👤 Lucinda F. Buhse
- 👤 Glenn W. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:22
CPC Classifications
C; C08; C08L; C08L33/00; C08L33/24; C08F; C08F6/00; C08F6/001; C08F6/005
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
A polymer having a trimethylamine content of below 30 ppm and containing at least about 30 weight percent of glutarimide units having the structure ##STR4## wherein R 1 and R 2 are separately H or CH 3 , and R 3 is H, C 1 -C 20 alkyl, substituted C 1 -C 20 alkyl, cycloalkyl, aryl, substituted aryl, aralkyl, substituted aralkyl, or heterocyclic, prepared by the process comprising: a) mixing the polymer in the molten state with methanol, ethanol, water, or mixtures thereof in their liquid state; b) removing the methanol, ethanol, water, or mixtures thereof in their liquid state; and c) devolatilizing the molten polymer by application of vacuum.
Claim 2
Dependent Claim
110 words
A polymer having a trimethylamine content of below 30 ppm and containing at least about 30 weight percent of glutarimide units having the structure ##STR4## wherein R 1 and R 2 are separately H or CH 3 , and R 3 is H, C 1 -C 20 alkyl, substituted C 1 -C 20 alkyl, cycloalkyl, aryl, substituted aryl, aralkyl, substituted aralkyl, or heterocyclic, prepared by the process comprising: a) mixing the polymer in the molten state with methanol, ethanol, water, or mixtures thereof in their liquid state; b) removing the methanol, ethanol, water, or mixtures thereof in their liquid state; and c) devolatilizing the molten polymer by application of vacuum.
Claim 3
Dependent Claim
30 words
The polymer of claim 1 wherein R 1 , R 2 , and R 3 are CH 3 , and wherein the polymer further contains units derived from methyl methacrylate.
Claim 4
Dependent Claim
15 words
The polymer of claim 1 having a trimethylamine content of less than about 3 ppm.
Claim 5
Dependent Claim
26 words
A blend of from about 5 to about 95 parts of the polymer of claim 1 with about 95 to about 5 parts of poly(vinyl chloride).
Claim 6
Dependent Claim
33 words
The blend of claim 4 containing from about 1 to about 40 parts (per 100 parts of the poly(vinyl chloride)) of the polymer containing at least about 30 weight percent of glutarimide units.
Claim 7
Dependent Claim
18 words
The blend of claim 5, wherein the polymer has a content of trimethylamine less than about 3 ppm.
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) | 1995-10-27 | 1996-04-27 | 1996-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-27 | 2000-04-27 | 2000-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-27 | 2004-04-27 | 2004-10-27 | $7700.00 | Window Closed / Lapsed |