Patent US4060451A successfully refreshed from Google Patents.
US4060451A
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Polyamide-imide and mica pulp particles and paper-like sheets made therefrom
Assignee: Teijin Ltd
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Filing: 1976-07-08
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Granted: 1977-11-29
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Expires: 1996-07-08
Abstract
Abstract Pulp particles consisting essentially of 50 to 90% by weight of mica particles and 50 to 10% by weight of polyamide-imide, said polyamide-imide forming a continuous phase in which said mica particles are dispersed discontinuously. A paper-like sheet comprising an integrated intimate mixture of 20 to 95% by weight of the pulp particles and 80 to 5% by weight of staple fibers of a thermally stable polymer.
Inventors
- 👤 Shuichi Uchiyama
- 👤 Satoshi Utsunomiya
- 👤 Hideo Watase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:46
CPC Classifications
C; C04; C04B; C04B30/00; C04B30/02; C04B18/00; C04B18/02; C04B18/022; C08; C08G; C08G73/00; C08G73/06; C08G73/0605; C08G73/0616; C08G73/0666; C08G73/0677; C08G73/10; C08G73/1067; C08G73/14; C08G73/18; C08G73/22; C08G75/00; C08G75/32; C08K; C08K3/00; C08K3/34; D; D21; D21H; D21H13/00; D21H13/10; D21H13/20; D21H13/26; D21H13/36; D21H13/38; D21H13/44; H; H01; H01B; H01B3/00; H01B3/02; H01B3/04; H01B3/18; H01B3/30; H01B3/303
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
87 words
Pulp particles consisting essentially of 50 to 90% by weight of mica particles having a particle size in a range of 60 - 3000 Tyler mesh and 50 to 10% by weight of a film-forming polyamide-imide at least 70 mol % of which recurring units consist of at least one or more of recurring units of the following formula ##STR10## wherein X is --O-- or --CH 2 -- in which said polyamide-imide forms a continuous phase and said mica particles are dispersed discontinuously in said continuous phase.
Claim 2
Dependent Claim
87 words
Pulp particles consisting essentially of 50 to 90% by weight of mica particles having a particle size in a range of 60 - 3000 Tyler mesh and 50 to 10% by weight of a film-forming polyamide-imide at least 70 mol % of which recurring units consist of at least one or more of recurring units of the following formula ##STR10## wherein X is --O-- or --CH 2 -- in which said polyamide-imide forms a continuous phase and said mica particles are dispersed discontinuously in said continuous phase.
Claim 3
Dependent Claim
27 words
The particles according to claim 1 wherein not less than 85 mol % of recurring units of said polyamide-imide comprise the recurring units expressed by said formula.
Claim 4
Dependent Claim
19 words
The pulp particles according to claim 1 which has a logarithmic viscosity from 0.35 to 2.0 measured in N-methyl-2-pyrrolidone.
Claim 5
Dependent Claim
19 words
The pulp particles of claim 1 wherein the content of said mica particles is 60 to 80% by weight.
Claim 6
Dependent Claim
19 words
The pulp particles of claim 1 wherein the content of said mica particles is 60 to 70% by weight.
Claim 7
Dependent Claim
35 words
A paper-like sheet comprising an integrated intimate mixture of 20 to 95% by weight of the pulp particles of claim 1 and 80 to 5% by weight of staple fibers of a thermally stable polymer.
Claim 8
Dependent Claim
15 words
The sheet of claim 6 wherein said staple fibers consist of a nitrogen-containing polyheterocyclic compound.
Claim 9
Dependent Claim
14 words
The sheet of claim 6 wherein said staple fibers consist of an aromatic polyamide.
Claim 10
Dependent Claim
14 words
The sheet of claim 6 wherein said staple fibers consist of an aromatic polyester.
Claim 11
Dependent Claim
75 words
Pulp particles consisting essentially of 50 - 90% by weight of mica particles having a particle size such that at least 90% by weight are from 1 to 150 microns, and 50 - 10% by weight of a film-forming polyamide-imide having recurring units which consist essentially of ##STR11## wherein X is --O-- or --CH 2 -- in which said polyamide-imide forms a continuous phase and said mica particles are dispersed discontinuously in said continuous phase.
Claim 12
Dependent Claim
75 words
Pulp particles consisting essentially of 50 - 90% by weight of mica particles having a particle size such that at least 90% by weight are from 1 to 150 microns, and 50 - 10% by weight of a film-forming polyamide-imide having recurring units which consist essentially of ##STR11## wherein X is --O-- or --CH 2 -- in which said polyamide-imide forms a continuous phase and said mica particles are dispersed discontinuously in said continuous phase.
Claim 13
Dependent Claim
21 words
The pulp particles according to claim 10 which has a logarithmic viscosity from about 0.5 to about 0.8 measured in N-methyl-2-pyrrolidone.
Claim 14
Dependent Claim
20 words
The pulp particles according to claim 10 wherein the content of said mica particles is 60 to 80% by weight.
Claim 15
Dependent Claim
19 words
The pulp particles of claim 10 wherein the content of said mica particles is 60 to 70% by weight.
Claim 16
Dependent Claim
35 words
A paper-like sheet comprising an integrated intimate mixture of 20 to 95% by weight of the pulp particles of claim 10 and 80 to 5% by weight of staple fibers of a thermally stable polymer.
Claim 17
Dependent Claim
15 words
The sheet of claim 14 wherein said stable fibers consist of a nitrogen-containing polyheterocyclic compound.
Claim 18
Dependent Claim
14 words
The sheet of claim 14 wherein said staple fibers consist of an aromatic polyamide.
Claim 19
Dependent Claim
14 words
The sheet of claim 14 wherein said staple fibers consist of an aromatic polyester.
References Cited (Backward Citations)
FR2179004A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |