Patent US4016140A successfully refreshed from Google Patents.
US4016140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amide-imide copolymer moldings and method of preparation
Assignee: Standard Oil Co
•
Filing: 1974-12-30
•
Granted: 1977-04-05
•
Expires: 1994-12-30
Abstract
Abstract Copolymers of the amide-imide variety are made from a mixture of two or more largely- or wholly-aromatic primary diamines and an aromatic polycarboxylic-acid-anhydride derivative. A process for fabricating molded articles from these copolymers is described which comprises heat treating the copolymers from about 300° to about 700° F. and then applying a pressure of about 200 p.s.i. to about 30,000 p.s.i. to said partially cured material which has been preheated to a temperature within the range of about 200° to about 750° F. and subsequentlyejecting the coalesced polyamide-imide in the form of a shaped article.
Inventors
- 👤 Edwin F. Morello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:18
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14; Y; Y10; Y10S; Y10S264/00; Y10S264/65
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
221 words
A process for preparing a molded article which consists essentially of the steps: (1) heating a copolymer consisting essentially of A units having a formula selected from the group consisting of: ##STR3## and B units having a formula selected from the group consisting of: ##STR4## wherein R 1 and R 2 are different and are chosen from the class consisting of: ______________________________________
##STR5##
and
##STR6##
andTR7##
##STR8##
andTR9##
##STR10##
andTR11##
##STR12##
andTR13##
##STR14##
______________________________________ and wherein the proportions of A and B units run from about 1 mole percent A units and about 99 mole percent B units to about 99 mole percent A units and about 1 mole percent B units and wherein the R 1 and R 2 containing components of the A and B units run from about 10 mole percent R 1 containing component and about 90 mole percent R 2 containing component to about 90 mole percent of the R 1 containing component and about 10 mole percent of the R 2 containing component in the temperature range from about 300° to about 700° F. for about 0.5 to about 5 hours, and (2) thereafter applying a pressure of about 200 p.s.i. to about 30,000 p.s.i. to said copolymer while said copolymer is being heated in the temperature range from about 200° to about 750° F.
Claim 2
Dependent Claim
221 words
A process for preparing a molded article which consists essentially of the steps: (1) heating a copolymer consisting essentially of A units having a formula selected from the group consisting of: ##STR3## and B units having a formula selected from the group consisting of: ##STR4## wherein R 1 and R 2 are different and are chosen from the class consisting of: ______________________________________
##STR5##
and
##STR6##
andTR7##
##STR8##
andTR9##
##STR10##
andTR11##
##STR12##
andTR13##
##STR14##
______________________________________ and wherein the proportions of A and B units run from about 1 mole percent A units and about 99 mole percent B units to about 99 mole percent A units and about 1 mole percent B units and wherein the R 1 and R 2 containing components of the A and B units run from about 10 mole percent R 1 containing component and about 90 mole percent R 2 containing component to about 90 mole percent of the R 1 containing component and about 10 mole percent of the R 2 containing component in the temperature range from about 300° to about 700° F. for about 0.5 to about 5 hours, and (2) thereafter applying a pressure of about 200 p.s.i. to about 30,000 p.s.i. to said copolymer while said copolymer is being heated in the temperature range from about 200° to about 750° F.
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein a pressure of about 200 p.s.i. to about 25,000 p.s.i. is applied while said copolymer is being heated in the temperature range from about 400° to about 750° F.
Claim 4
Dependent Claim
73 words
The process of claim 1 wherein R 1 is ##STR15## and R 2 is ##STR16## and wherein R 1 and R 2 containing components of said A and B units are present in the proportions of about 30 mole percent of R 1 containing components and about 70 mole percent of R 2 containing components to about 70 mole percent R 1 containing components and about 30 mole percent R 2 containing components.
Claim 5
Dependent Claim
30 words
The process of claim 3 wherein said step (1) is carried out in the temperature range from about 500° to about 600° F. for about 1 to about 2 hours.
Claim 6
Dependent Claim
34 words
The process of claim 4 wherein a pressure of about 1,000 to about 20,000 p.s.i. is applied while said copolymer is being heated in the temperature range from about 600° to about 750° F.
Claim 7
Dependent Claim
17 words
A shaped article prepared by the method of claim 1 comprising coalesced solid particles of polyamide-imide copolymer.
Claim 8
Dependent Claim
17 words
A shaped article prepared by the method of claim 2 comprising coalesced solid particles of polyamide-imide copolymer.
Claim 9
Dependent Claim
17 words
A shaped article prepared by the method of claim 3 comprising coalesced solid particles of polyamide-imide copolymer.
Claim 10
Dependent Claim
17 words
A shaped article prepared by the method of claim 4 comprising coalesced solid particles of polyamide-imide copolymer.
Claim 11
Dependent Claim
17 words
A shaped article prepared by the method of claim 5 comprising coalesced solid particles of polyamide-imide copolymer.
Claim 12
Dependent Claim
125 words
The process of claim 1 wherein said copolymer contains in addition reoccurring A units having the formula of: ##STR17## and reoccurring B units having the formula of: ##STR18## wherein R 3 is different from either R 1 or R 2 but R 3 is selected as are R 1 and R 2 and wherein the R 1 , R 2 and R 3 components of the A and B units run from about 10 mole percent of the R 1 components and about 40 to about 50 mole percent each of the R 2 and R 3 components to about 50 mole percent of the R 1 components and about 10 to about 40 mole percent each of the R 2 and R 3 components.
Claim 13
Dependent Claim
35 words
The process of claim 11 wherein a pressure of about 200 p.s.i. to about 25,000 p.s.i. is applied while said copolymer is being heated in the temperature range from about 400° to about 750° F.
Claim 14
Dependent Claim
17 words
A shaped article prepared by the method of claim 11 comprising coalesced solid particles of polyamide-imide copolymer.
Claim 15
Dependent Claim
17 words
A shaped article prepared by the method of claim 12 comprising coalesced solid particles of polyamide-imide copolymer.
Claim 16
Dependent Claim
193 words
A process for preparing a molding powder which consists essentially of: 1. treating a solution of copolymer in an organic solvent with water sufficiently low in cation concentration that the molding properties of said copolymer are not deteriorated, wherein said copolymer consists essentially of A units having a formula selected from the group consisting of: ##STR19## and B units having a formula selected from the group consisting of: ##STR20## wherein R 1 and R 2 are different and are chosen from the class consisting of: ______________________________________
##STR21##
and
##STR22##
andTR23##
##STR24##
andTR25##
##STR26##
andTR27##
##STR28##
andTR29##
##STR30##
______________________________________ and wherein the proportions of A and B units run from about 1 mole percent A units and about 99 mole percent B units to about 99 mole percent A units and about 1 mole percent B units and wherein the R 1 and R 2 containing components of the A and B units run from about 10 mole percent R 1 containing component and about 90 mole percent R 2 containing component to about 90 mole percent of the R 1 containing component and about 10 mole percent of the R 2 containing component;
Claim 17
Dependent Claim
193 words
A process for preparing a molding powder which consists essentially of: 1. treating a solution of copolymer in an organic solvent with water sufficiently low in cation concentration that the molding properties of said copolymer are not deteriorated, wherein said copolymer consists essentially of A units having a formula selected from the group consisting of: ##STR19## and B units having a formula selected from the group consisting of: ##STR20## wherein R 1 and R 2 are different and are chosen from the class consisting of: ______________________________________
##STR21##
and
##STR22##
andTR23##
##STR24##
andTR25##
##STR26##
andTR27##
##STR28##
andTR29##
##STR30##
______________________________________ and wherein the proportions of A and B units run from about 1 mole percent A units and about 99 mole percent B units to about 99 mole percent A units and about 1 mole percent B units and wherein the R 1 and R 2 containing components of the A and B units run from about 10 mole percent R 1 containing component and about 90 mole percent R 2 containing component to about 90 mole percent of the R 1 containing component and about 10 mole percent of the R 2 containing component;
Claim 18
Dependent Claim
59 words
separating said copolymer from the bulk of said water and said organic solvent; 3. washing said copolymer with an additional amount of said water; 4. separating said copolymer from the bulk of said additional water; and 5. heating said copolymer in the temperature range of from about 300° to about 700° F. for about 0.5 to about 5 hours.
Claim 19
Dependent Claim
59 words
separating said copolymer from the bulk of said water and said organic solvent; 3. washing said copolymer with an additional amount of said water; 4. separating said copolymer from the bulk of said additional water; and 5. heating said copolymer in the temperature range of from about 300° to about 700° F. for about 0.5 to about 5 hours.
Claim 20
Dependent Claim
50 words
The process for preparing a molded article which comprises applying a pressure of about 200 psi to about 30,000 psi to the molding powder copolymer produced by the process of claim 15 while said copolymer is at a temperature in the range of from about 200° to about 750° F.
Claim 21
Dependent Claim
63 words
The process of claim 15, wherein hypohalous acid is a byproduct of the reaction used to prepare said copolymer, the water sufficiently low in cation concentration that the molding properties of said copolymer are not deteriorated is distilled water and the washing with said distilled water is continued until wash water has a pH in the range of about 4 to about 5.
Claim 22
Dependent Claim
14 words
The process of claim 15, wherein steps (2) and (4) are achieved by centrifuging.
References Cited (Backward Citations)
US3260691A
Cited
US3347828A
Cited
US3392144A
Cited
US3494890A
Cited
US3546152A
Cited
US3573260A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |