Patent US4731390A successfully refreshed from Google Patents.
US4731390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biaxially stretched polyparaphenylene sulfide film
Assignee: Kureha Corp
•
Filing: 1987-04-01
•
Granted: 1988-03-15
•
Expires: 2007-04-01
Abstract
Abstract Disclosed herein is a biaxially stretched polyparaphenylene sulfide film comprising a resin composition consisting essentially of 100 parts by weight of a resin of polyparaphenylene sulfide series and from 0.3 to 15 parts by weight of poly(4-methylpentene-1).
Inventors
- 👤 Toshiya Mizuno
- 👤 Satoshi Hirose
- 👤 Yoshikichi Teramoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:12
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L81/00; C08L81/02; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/301; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/14; H01G4/18; C08J2381/00; C08J2381/02; C08L23/00; C08L23/02; C08L23/18; C08L23/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
33 words
A biaxially stretched polyparaphenylene sulfide film comprising a resin composition consisting essentially of 100 parts by weight of a resin of polyparaphenylene sulfide and from 0.3 to 15 parts by weight of poly(4-methylpentene-1).
Claim 2
Dependent Claim
33 words
A biaxially stretched polyparaphenylene sulfide film comprising a resin composition consisting essentially of 100 parts by weight of a resin of polyparaphenylene sulfide and from 0.3 to 15 parts by weight of poly(4-methylpentene-1).
Claim 3
Dependent Claim
49 words
A biaxially stretched polyparaphenylene sulfide film according to claim 1, which has a kinetic friction coefficient between said films of not more than 0.6 at a temperature of 20° C. and RH of 70%, and a center-line average roughness (Ra) of said film of from 0.02 to 0.5 μm.
Claim 4
Dependent Claim
28 words
A biaxially stretched polyparaphenylene sulfide film according to claim 1, wherein the melt flow rate of said poly(4-methylpentene-1) is not more than 100 g/10 min at 260° C.
Claim 5
Dependent Claim
63 words
A biaxially stretched polyparaphenylene sulfide film according to claim 1, wherein the amount of said poly(4-methylpentene-1) is from 0.3 to 5 parts by weight to 100 parts by weight of said resin of polyparaphenylene sulfide, said film having minute hollows of an average diameter of not more than 10 μm in number of not less than 10 2 /mm 2 of the surface.
Claim 6
Dependent Claim
34 words
A biaxially stretched polyparaphenylene sulfide film according to claim 1, wherein said resin of polyparaphenylene sulfide is a homopolymer of paraphenylene sulfide or a copolymer composed of paraphenylene sulfide unit and metaphenylene sulfide unit.
References Cited (Backward Citations)
US4111860A
Cited
US4045382A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |