Patent US3870674A successfully refreshed from Google Patents.
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
•
Granted: 1975-03-11
•
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 10:03
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
References Cited (Backward Citations)
US2929800A
Cited
US3493540A
Cited
US3499858A
Cited
US3446771A
Cited
US3562189A
Cited
US3673145A
Cited
US3666709A
Cited
US3708458A
Cited
US3794611A
Cited
US3781240A
Cited
US3773701A
Cited
US3787367A
Cited
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 |