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US4650824A
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Interpolymers of polyvinyl chloride and polyimides
Assignee: Rohm and Haas Co
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Filing: 1986-04-30
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Granted: 1987-03-17
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Expires: 2006-04-30
Abstract
Abstract Interpolymers made by polymerizing vinyl chloride monomer in the presence of a polyimide show excellent heat distortion resistance and processing characteristics.
Inventors
- 👤 Richard R. Clikeman
- 👤 Douglas S. Cinoman
- 👤 Ernst D. Weiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:31
CPC Classifications
C; C08; C08F; C08F214/00; C08L; C08L79/00; C08L79/04; C08L79/08; C08F14/00; C08F14/02; C08F14/04; C08F14/06; C08F283/00; C08F283/04; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L33/00; C08L33/24
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
39 words
An interpolymer of polyvinyl chloride and a polyimide from which any acid and anhydride groups that may have been formed during imidization have been largely or completely eliminated, in a weight ratio of from about 49:1 to about 1.5:1.
Claim 2
Dependent Claim
39 words
An interpolymer of polyvinyl chloride and a polyimide from which any acid and anhydride groups that may have been formed during imidization have been largely or completely eliminated, in a weight ratio of from about 49:1 to about 1.5:1.
Claim 3
Dependent Claim
20 words
The interpolymer of claim 1 wherein the weight ratio of PVC to polyimide is from about 32:1 to about 1.9:1.
Claim 4
Dependent Claim
20 words
The interpolymer of claim 1 wherein the weight ratio of PVC to polyimide is from about 19:1 to about 2.3:1.
Claim 5
Dependent Claim
14 words
The interpolymer of claims 1, 2 or 3 wherein the polyimide contains glutarimide units.
Claim 6
Dependent Claim
15 words
The interpolymer of claims 1, 2 or 3 wherein the polyimide contains N-methyl glutarimide units.
Claim 7
Dependent Claim
24 words
The interpolymer of claim 1 wherein any remaining acid and anhydride groups are present at a level of less than about 2% by weight.
Claim 8
Dependent Claim
24 words
The interpolymer of claim 1 wherein any remaining acid and anhydride groups are present at a level of less than about 0.5% by weight.
Claim 9
Dependent Claim
24 words
The interpolymer of claim 1 wherein any remaining acid and anhydride groups are present at a level of less than about 0.2% by weight.
Claim 10
Dependent Claim
50 words
A process for preparing an interpolymer of polyvinyl chloride and polyimide which comprises polymerizing, at elevated temperature, vinyl chloride monomer in the presence of a polyimide from which any acid and anhydride groups that may have been formed during imidization have been largely or completely eliminated and a free-radical initiator.
Claim 11
Dependent Claim
50 words
A process for preparing an interpolymer of polyvinyl chloride and polyimide which comprises polymerizing, at elevated temperature, vinyl chloride monomer in the presence of a polyimide from which any acid and anhydride groups that may have been formed during imidization have been largely or completely eliminated and a free-radical initiator.
Claim 12
Dependent Claim
28 words
The process of claim 9 wherein the vinyl chloride monomer is suspension polymerized in the presence of the polyimide, the initiator, a suspending agent and a suspending liquid.
Claim 13
Dependent Claim
11 words
The process of claim 10 wherein the suspending liquid is water.
Claim 14
Dependent Claim
11 words
The process of claim 11 wherein the polyimide contains glutarimide units.
Claim 15
Dependent Claim
12 words
The process of claim 11 wherein the polyimide contains N-methyl glutarimide units.
Claim 16
Dependent Claim
20 words
The process of claim 9 wherein the elevated temperature is a temperature from about 45° C. to about 60° C.
Claim 17
Dependent Claim
20 words
The process of claim 9 wherein the elevated temperature is a temperature from about 50° C. to about 55° C.
Claim 18
Dependent Claim
11 words
The process of claim 9 wherein the initiator is a peroxydicarbonate.
Claim 19
Dependent Claim
11 words
The process of claim 9 wherein the polyimide contains glutarimide units.
Claim 20
Dependent Claim
12 words
The process of claim 9 wherein the polyimide contains N-methyl glutarimide units.
Claim 21
Dependent Claim
23 words
The process of claim 17 or 18 wherein the weight ratio of PVC to the polyimide is from about 32:1 to about 1.9:1.
Claim 22
Dependent Claim
22 words
The process of claim 17 or 18 wherein the weight ratio of PVC to polyimide is from about 19:1 to about 2.3:1.
Claim 23
Dependent Claim
65 words
A process for reducing the amount of residual vinyl chloride monomer present in the PVC-imide interpolymer of claim 1 which comprises the steps of (a) interpolymerizing the vinyl chloride monomer and polyimide in the presence of a finely divided, polymeric solid insoluble or only sparingly soluble in any of the other materials present during interpolymerization, and (b) subjecting the resulting interpolymer to a residual-monomer-removal step.
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) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |