US5077343A
Expired / Lapsed
US
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Method for preparing imide-containing polymers
Assignee: Dow Chemical Co
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Filing: 1991-02-08
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Granted: 1991-12-31
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Expires: 2011-02-08
Abstract
Abstract Imide-containing polymers of styrene-type monomers are prepared by a process comprising solution polymerizing under free radical polymerization conditions a polymerizable monomer composition comprising at least one vinylaromatic monomer and at least one maleamic monocarboxylic acid monomer.
Inventors
- 👤 Thomas H. Newman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:19
CPC Classifications
C; C08; C08F; C08F291/00; C08F291/02; C08F212/00; C08F212/02; C08F212/04; C08F222/00; C08F222/36; C08F222/40; C08F222/402
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
78 words
A process for preparing elastomer modified imide-containing vinylaromatic polymers comprising polymerizing under free radical polymerization conditions in the substantial absence of a dehydration cyclization catalyst, a polymerizable monomer composition comprising at least one vinylaromatic monomer, a natural or synthetic elastomer and at least one maleamic monocarboxylic acid monomer, to form a vinylaromatic monomer-maleamic monocarboxylic acid polymer which is in situ dehydrated and cyclized to form an imide-containing vinylaromatic polymer, and subsequently recovering said elastomer modified imide-containing vinylaromatic polymer.
Claim 2
Dependent Claim
78 words
A process for preparing elastomer modified imide-containing vinylaromatic polymers comprising polymerizing under free radical polymerization conditions in the substantial absence of a dehydration cyclization catalyst, a polymerizable monomer composition comprising at least one vinylaromatic monomer, a natural or synthetic elastomer and at least one maleamic monocarboxylic acid monomer, to form a vinylaromatic monomer-maleamic monocarboxylic acid polymer which is in situ dehydrated and cyclized to form an imide-containing vinylaromatic polymer, and subsequently recovering said elastomer modified imide-containing vinylaromatic polymer.
Claim 3
Dependent Claim
21 words
A process according to claim 1 wherein the elastomer is present in an amount from 5 to 20 percent by weight.
Claim 4
Dependent Claim
18 words
A process according to claim 1 wherein the elastomer is a conjugated 1,3-diene, ethylene-propylenediene terpolymer or nitrile rubber.
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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) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-30 | 2003-07-01 | 2003-12-31 | $7700.00 | Window Closed / Lapsed |