US4794128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous film
Assignee: Kao Corp
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Filing: 1987-05-27
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Granted: 1988-12-27
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Expires: 2007-05-27
Abstract
Abstract A porous film comprises a polyolefin resin, a filler and a polyester obtained from a polybasic acid, a polyhydric alcohol and a monobasic acid having 14 to 22 carbon atoms and/or a monohydric alcohol having 12 to 22 carbon atoms or a polyester obtained from a polybasic acid and a monohydric alcohol, the film being obtained by melting and moulding and then stretching. It has a good permeability to moisture and impermeability to liquid, and is useful for a sanitary napkin.
Inventors
- 👤 Heihachiro Kawaguchi
- 👤 Hidenori Shirai
- 👤 Akio Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:59
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/10; C; C08; C08J; C08J5/00; C08J5/18; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/225; C08J2323/00; C08J2323/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
64 words
A porous film which comprises a polyolefin resin, a filler and a polyester obtained from a polybasic acid, a polyhydric alcohol and a monobasic acid having 14 to 22 carbon atoms and/or a monohydric alcohol having 12 to 22 carbon atoms or a polyester obtained from a polybasic acid and a monohydric alcohol, the film being obtained by melting and moulding and then stretching.
Claim 2
Dependent Claim
64 words
A porous film which comprises a polyolefin resin, a filler and a polyester obtained from a polybasic acid, a polyhydric alcohol and a monobasic acid having 14 to 22 carbon atoms and/or a monohydric alcohol having 12 to 22 carbon atoms or a polyester obtained from a polybasic acid and a monohydric alcohol, the film being obtained by melting and moulding and then stretching.
Claim 3
Dependent Claim
23 words
A porous film as claimed in claim 1, in which said polyester has been obtained from a polybasic acid and a monohydric alcohol.
Claim 4
Dependent Claim
32 words
A porous film as claimed in claim 1, in which said polyester has been obtained from a polyhydric alcohol, a polybasic acid and a monohydric alcohol having 12 to 22 carbon atoms.
Claim 5
Dependent Claim
32 words
A porous film as claimed in claim 1, in which said polyester has been obtained from a polyhydric alcohol, a polybasic acid and a monobasic acid having 14 to 22 carbon atoms.
Claim 6
Dependent Claim
17 words
A porous film as claimed in claim 1, in which one monomer for the polyester is branched.
Claim 7
Dependent Claim
17 words
A porous film as claimed in claim 1, which has been uniaxially stretched 1.5 to 3.0 times.
Claim 8
Dependent Claim
37 words
A porous film as claimed in claim 1, which comprises 100 parts by weight of the polyolefin resin, 50 to 250 parts by weight of the filler and 5 to 50 parts by weight of the polyester.
Claim 9
Dependent Claim
17 words
A porous film as claimed in claim 1, in which said polyolefin resin is polyethylene or polypropylene.
Claim 10
Dependent Claim
18 words
A porous film as claimed in claim 1, in which said polyolefin is a linear, low density polyethylene.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-27 | 1992-06-27 | 1992-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-27 | 1996-06-27 | 1996-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-27 | 2000-06-27 | 2000-12-27 | $7700.00 | Window Closed / Lapsed |