Patent US4794128A successfully refreshed from Google Patents.
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 11:52
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.
References Cited (Backward Citations)
US3459736A
Cited
GB1044502A
Cited
US4105737A
Cited
US4100238A
Cited
US4116892A
Cited
US4454256A
Cited
JPS5962117A
Cited
US4705813A
Cited
US4563317A
Cited
US4705812A
Cited
JPS60230825A
Cited
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 |