US4320207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester film containing fine powder of crosslinked polymer
Assignee: Diafoil Co Ltd
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Filing: 1980-04-28
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Granted: 1982-03-16
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Expires: 2000-04-28
Abstract
Abstract There is disclosed a polyester film containing from 0.001% to 4% by weight fine particles of a crosslinked polymer having an average diameter of 0.1 to 5μ, said fine particles being derived by pulverization from a crosslinked polymer having a specific surface area of at least 1 m 2 /g and a pore volume of at least 0.1 ml/g. The films of the present invention are useful as high grade films and afford many advantages in various applications, for example, as magnetic tapes, capacitors, photography, printing plate making, releasing and the like.
Inventors
- 👤 Masamichi Watanabe
- 👤 Seiji Sakamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:07
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
112 words
A polyester film containing from 0.001% to 4% by weight fine particles of a crosslinked polymer having an average diameter of 0.1 to 5μ, said fine particles containing numerous pores and being derived by pulverization from a crosslinked polymer having a specific area of at least 1 m 2 /g and a pore volume of at least 0.1 ml/g, and having a functional group capable of reacting with the polyester to form a covalent bond or from a crosslinked polymer having no functional group capable of reacting with the polyester and obtained by using at least one member of the class consisting of styrene and an alkyl-substituted styrene as a monovinyl component.
Claim 2
Dependent Claim
112 words
A polyester film containing from 0.001% to 4% by weight fine particles of a crosslinked polymer having an average diameter of 0.1 to 5μ, said fine particles containing numerous pores and being derived by pulverization from a crosslinked polymer having a specific area of at least 1 m 2 /g and a pore volume of at least 0.1 ml/g, and having a functional group capable of reacting with the polyester to form a covalent bond or from a crosslinked polymer having no functional group capable of reacting with the polyester and obtained by using at least one member of the class consisting of styrene and an alkyl-substituted styrene as a monovinyl component.
Claim 3
Dependent Claim
18 words
The polyester film as claimed in claim 1 wherein the fine particles are covalently bonded to the polyester.
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) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |