US4699733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin compostion for porous film and film prepared therefrom
Assignee: Mitsui Toatsu Chemicals Inc
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Filing: 1986-12-11
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Granted: 1987-10-13
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Expires: 2006-12-11
Abstract
Abstract A porous film having a good water vapor permeability is obtained with a high productivity by melting a resin composition comprising 100 parts by weight of a polyolefin resin and 50 to 500 parts by weight of barium sulfate having an electric conductivity of 250 mu S/cm or less in terms of the electric conductivity of a supernatant formed when the barium sulfate is added to water, and a particle size of 0.1 to 7 mu m, making the melt into a film and stretching the film to 2.5 to 14 times the original area at least in the uniaxial direction.
Inventors
- 👤 Shuji Matsumura
- 👤 Michiyasu Ito
- 👤 Syoichi Tsuji
- 👤 Hisatosi Suzuki
- 👤 Syoichi Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:46
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08J; C08J5/00; C08J5/18; C08K; C08K3/00; C08K3/30; C08J2323/00; C08J2323/02; Y; Y10; Y10S; Y10S264/00; Y10S264/73
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A porous film obtained by melting a resin composition comprising 100 parts by weight of a polyolefin resin and 50 to 500 parts by weight of barium sulfate having an electric conductivity of 250 μS/cm or less in terms of the electric conductivity of a supernatant formed when said barium sulfate is added to water, and a particle size of 0.1 to 7 μm, making the resulting melt into a film and stretching the film to 2.5 to 14 times the original area at least in the uniaxial direction.
Claim 2
Dependent Claim
89 words
A porous film obtained by melting a resin composition comprising 100 parts by weight of a polyolefin resin and 50 to 500 parts by weight of barium sulfate having an electric conductivity of 250 μS/cm or less in terms of the electric conductivity of a supernatant formed when said barium sulfate is added to water, and a particle size of 0.1 to 7 μm, making the resulting melt into a film and stretching the film to 2.5 to 14 times the original area at least in the uniaxial direction.
References Cited (Backward Citations)
US4347844A
Cited
GB2151538A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-12 | 1991-04-13 | 1991-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-12 | 1995-04-13 | 1995-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-12 | 1999-04-13 | 1999-10-13 | $7700.00 | Window Closed / Lapsed |