US3870674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particulate polyimide compositions containing phenal or dipolar aprotic solvents
Assignee: Pharmacia and Upjohn Co
•
Filing: 1974-01-16
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Granted: 1975-03-11
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Expires: 1994-01-16
Abstract
Abstract A solid polyimide composition is described with a softening point reduced to the range of about 50*C to about 150*C to facilitate molding and particularly extrusion. The composition comprises a blend of (a) a selected copolyimide and (b) a dipolar aprotic solvent or phenol having a boiling point > OR = 50*C higher than the softening point of the blend but not higher than about 225*C. The copolyimides are those characterized by solubility in organic polar solvents and by thermoplasticity.
Inventors
- 👤 Jr William J Farrissey
- 👤 Jr Karl W Rausch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:06
CPC Classifications
C; C08; C08L; C08L79/00; C08L79/04; C08L79/08; C08K; C08K5/00; C08K5/0008; C08K5/0016
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
44 words
A SOLID PARTICULATE, NON-CELLULAR, POLYIMIDE COMPOSITION HAVING A SOFTENING POINT IN THE RANGE OF ABOUT 50*C TO ABOUT 150*C AND COMPRISING A BLEND OF A. FROM ABOUT 85 PERCENT TO ABOUT 65 PERCENT BY WEIGHT OF A COPOLYMIMIDE SELECTED FROM THE CLASS CONSISTING OF
Claim 2
Dependent Claim
44 words
A SOLID PARTICULATE, NON-CELLULAR, POLYIMIDE COMPOSITION HAVING A SOFTENING POINT IN THE RANGE OF ABOUT 50*C TO ABOUT 150*C AND COMPRISING A BLEND OF A. FROM ABOUT 85 PERCENT TO ABOUT 65 PERCENT BY WEIGHT OF A COPOLYMIMIDE SELECTED FROM THE CLASS CONSISTING OF
Claim 3
Dependent Claim
7 words
A COPOLYIMIDE CHARACTERIZED BY THE RECURRING UNIT
Claim 4
Dependent Claim
7 words
A COPOLYIMIDE CHARACTERIZED BY THE RECURRING UNIT
Claim 5
Dependent Claim
52 words
A solid particulate, non-cellular, polyimide composition having a softening point in the range of about 50*C to about 150*C and comprising a blend of a. from about 85 percent to about 65 percent by weight of a copolyimide selected from the class consisting of i. a copolyimide characterized by the recurring unit
Claim 6
Dependent Claim
52 words
A solid particulate, non-cellular, polyimide composition having a softening point in the range of about 50*C to about 150*C and comprising a blend of a. from about 85 percent to about 65 percent by weight of a copolyimide selected from the class consisting of i. a copolyimide characterized by the recurring unit
Claim 7
Dependent Claim
32 words
A solid copolyimide composition according to claim 1 wherein the copolyimide is characterized by the recurring unit (I) wherein approximately 20 percent of said recurring units are those in which R represents
Claim 8
Dependent Claim
21 words
A solid copolyimide composition according to claim 1 wherein the copolyimide is characterized by the recurring unit (II) wherein R1 represents
Claim 9
Dependent Claim
15 words
A solid copolyimide composition according to claim 1 wherein the dipolar aprotic solvent is N-methylpyrrolidone.
Claim 10
Dependent Claim
15 words
A solid copolyimide composition according to claim 1 wherein the dipolar aprotic solvent is N-vinylpyrrolidone.
Claim 11
Dependent Claim
13 words
A solid copolyimide composition according to claim 1 wherein the phenol is m-cresol.
Claim 12
Dependent Claim
7 words
A COPOLYIMIDE CHARACTERIZED BY THE RECURRING UNIT
Claim 13
Dependent Claim
7 words
A COPOLYIMIDE CHARACTERIZED BY THE RECURRING UNIT
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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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |