Patent US4731288A successfully refreshed from Google Patents.
US4731288A
Expired / Lapsed
US
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Vinylidene fluoride resin film and metallized film thereof
Assignee: Kureha Corp
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Filing: 1985-03-27
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Granted: 1988-03-15
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Expires: 2005-03-27
Abstract
Abstract A vinylidene fluoride resin film having (1) a crystal melting point of 182° C. or higher as measured by differential scanning calorimeter in nitrogen atmosphere at a temperature elevation speed of 10° C./min; (2) a diffraction point corresponding to (1 1 ζ) of the α-phase crystal in the wide angle X-ray diffraction photograph; and (3) an orientation degree of the crystal of 0.85 or more when measured under irradiation of X-ray incident vertically on a major surface of the film. The vinylidene fluoride resin film is obtained by inflation accompanying melt necking stretching. The film has improved mechanical properties and heat-stability and is also adapted for use as a base film of a metallized film.
Inventors
- 👤 Toshiya Mizuno
- 👤 Yoshikichi Teramoto
- 👤 Naohiro Murayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:49
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C48/00; B29C48/001; B29C48/0018; B29C48/0019; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/10; B29C71/00; B29K; B29K2027/00; B29K2027/12; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/16; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/261; Y10T428/31504; Y10T428/3154; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
134 words
A vinylidene fluoride resin film comprising a homopolymer or copolymer of vinylidene fluoride having an inherent viscosity of 0.8 to 1.8 dl/g as measured in dimethylformamide at a concentration of 0.4 g/dl at 30° C., said vinylidene fluoride resin film having the characteristics (1) to (3) shown below: (1) a crystal melting point giving a heat absorption peak of from 182° C. to about 196° C. as measured by a differential scanning calorimeter in a nitrogen atmosphere at a temperature elevation speed of 10° C./min.; (2) a diffraction point corresponding to (1 1 ζ) of the α-phase crystal at a wide angle X-ray diffraction photograph; and (3) an orientation degree of the crystal of from 0.85 to about 0.94 when measured under irradiation of X-ray incident vertically on a major surface of the film.
Claim 2
Dependent Claim
134 words
A vinylidene fluoride resin film comprising a homopolymer or copolymer of vinylidene fluoride having an inherent viscosity of 0.8 to 1.8 dl/g as measured in dimethylformamide at a concentration of 0.4 g/dl at 30° C., said vinylidene fluoride resin film having the characteristics (1) to (3) shown below: (1) a crystal melting point giving a heat absorption peak of from 182° C. to about 196° C. as measured by a differential scanning calorimeter in a nitrogen atmosphere at a temperature elevation speed of 10° C./min.; (2) a diffraction point corresponding to (1 1 ζ) of the α-phase crystal at a wide angle X-ray diffraction photograph; and (3) an orientation degree of the crystal of from 0.85 to about 0.94 when measured under irradiation of X-ray incident vertically on a major surface of the film.
Claim 3
Dependent Claim
31 words
The vinylidene fluoride resin film according to claim 1, wherein the ratio of absorbance of the film at 510 cm -1 to that at 530 cm -1 is 0.3 or less.
Claim 4
Dependent Claim
20 words
The vinylidene fluoride resin film according to claim 1, wherein the crystal structure of the film is of the γ-phase.
Claim 5
Dependent Claim
35 words
The vinylidene fluoride resin film according to claim 1, which comprises vinylidene fluoride homopolymer or a copolymer of vinylidene fluoride and a monomer copolymerizable therewith comprising at least 70 mole % of vinylidene fluoride units.
Claim 6
Dependent Claim
43 words
The vinylidene fluoride resin film according to claim 1, which has a proportion of heat absorption area on a chart of the differential scanning calorimeter measurement based on the crystal melting point of 182° C. to about 196° C. of 5% or more.
Claim 7
Dependent Claim
34 words
The vinylidene fluoride resin film according to claim 5, wherein the proportion of the heat absorption area based on the crystal melting point of 182° C. to about 196° C. is 50% or more.
Claim 8
Dependent Claim
19 words
The vinylidene fluoride resin film according to claim 1, which has a thickness of from 0.5 to 15 microns.
Claim 9
Dependent Claim
35 words
A metallized film, comprising a vinylidene fluoride resin film according to any one of claims 1-4 or 5-7 and a metal film formed on at least one major surface of the vinylidene fluoride resin film.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 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 |
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