US4472328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing porous film or sheet
Assignee: Mitsubishi Chemical Corp
•
Filing: 1982-03-02
•
Granted: 1984-09-18
•
Expires: 2002-03-02
Abstract
Abstract A process for producing a porous film or sheet, which comprises melt-molding a composition prepared by compounding 100 parts by weight of a polyolefin resin with 25 to 400 parts by weight of a filler and 1 to 100 parts by weight of a liquid or waxy hydrocarbon polymer into film or sheet, and stretching the resulting film or sheet.
Inventors
- 👤 Masaaki Sugimoto
- 👤 Yukio Watanabe
- 👤 Kunio Bizen
- 👤 Tsunemitsu Hasegawa
- 👤 Masahiro Morita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:07
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C48/00; B29C48/022; B29C48/001; B29C48/0012; B29C48/0018; B29C48/03; B29C48/07; B29C48/08; B29K; B29K2105/00; B29K2105/04; B29K2105/06; B29K2105/12; C08J2323/00; C08J2323/02; Y; Y10; Y10S; Y10S264/00; Y10S264/13
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
135 words
A process for producing a porous film or sheet, which comprises melt-molding a composition prepared by compounding 100 parts by weight of at least one polyolefin resin selected from the group consisting of a linear low density polyethylene having a density of 0.91 or more, a high density polyethylene, and a polypropylene with 25 to 400 parts by weight of at least one filler having a mean particle size of not more than 30μ selected from the group consisting of inorganic fillers and cellulose type organic fillers and 1 to 100 parts by weight of at least one liquid hydrocarbon polymer, selected from the group consisting of liquid polybutene, liquid polybutadiene, and hydrogenated liquid polybutadiene having a saturated or mostly saturated main chain into a film or sheet, and stretching the resulting film or sheet.
Claim 2
Dependent Claim
135 words
A process for producing a porous film or sheet, which comprises melt-molding a composition prepared by compounding 100 parts by weight of at least one polyolefin resin selected from the group consisting of a linear low density polyethylene having a density of 0.91 or more, a high density polyethylene, and a polypropylene with 25 to 400 parts by weight of at least one filler having a mean particle size of not more than 30μ selected from the group consisting of inorganic fillers and cellulose type organic fillers and 1 to 100 parts by weight of at least one liquid hydrocarbon polymer, selected from the group consisting of liquid polybutene, liquid polybutadiene, and hydrogenated liquid polybutadiene having a saturated or mostly saturated main chain into a film or sheet, and stretching the resulting film or sheet.
Claim 3
Dependent Claim
23 words
The process as in claim 1, wherein said liquid polybutadiene and hydrogenated liquid polybutadiene polymer contains 1.5 to 5.0 hydroxy groups per molecule.
Claim 4
Dependent Claim
34 words
The process as in claim 1, wherein compounding of said composition is conducted by first dispersing and spreading said hydrocarbon polymer in said polyolefin resin powder, and then mixing the product with said filler.
Claim 5
Dependent Claim
14 words
The process as in claim 1, wherein said stretching treatment is a monoaxial stretching.
Claim 6
Dependent Claim
14 words
The process as in claim 1, wherein said stretching treatment is a biaxial stretching.
References Cited (Backward Citations)
US3154461A
Cited
GB1044028A
Cited
US3551538A
Cited
US3775521A
Cited
US3882063A
Cited
US3903234A
Cited
US4024213A
Cited
US4154715A
Cited
US4335026A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |