Patent US5464689A successfully refreshed from Google Patents.
US5464689A
Expired / Lapsed
US
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Resin composition, porous film produced therefrom and process for producing same
Assignee: Tokuyama Corp
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Filing: 1994-06-14
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Granted: 1995-11-07
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Expires: 2014-06-14
Abstract
Abstract A resin composition which comprises 95 to 60 volume % of a resin mixture of 40 to 85% by weight of a copolymer between D-hydroxybutyrate and D-hydroxyvalerate containing 8 to 15 mol % of D-hydroxyvalerate-derived monomer unit and 60 to 15% by weight of poly- epsilon -caprolactone, and 5 to 40 volume % of an inorganic filler or fillers, a porous film produced from the resin composition and having a void volume of 10 to 70%, and a process for producing the porous film are disclosed. The film can be produced by melting the resin composition, forming it into a film, and stretching the film in at least one direction. The porous film can easily be degraded by microorganisms. Examples of the inorganic filler include barium sulfate, with the particle size being preferably 0.1 to 10.0 mu m.
Inventors
- 👤 Hiroshi Matsumura
- 👤 Takaaki Shimada
- 👤 Takayuki Hisanaka
- 👤 Yoshiki Ochi
- 👤 Tetsuo Kuwaki
- 👤 Yoshinobu Muta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:24
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L67/00; C08L67/04; C08J2367/00; C08J2367/04; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249986
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
58 words
A resin composition which comprises of 95 to 60 volume % of a resin mixture of 40 to 85% by weight of a copolymer between D-hydroxybutyrate and D-hydroxyvalerate containing 8 to 15 mol % of D-hydroxyvalerate-derived monomer unit and 60 to 15% by weight of poly-ε-caprolactone, and 5 to 40 volume % of an inorganic filler or fillers.
Claim 2
Dependent Claim
58 words
A resin composition which comprises of 95 to 60 volume % of a resin mixture of 40 to 85% by weight of a copolymer between D-hydroxybutyrate and D-hydroxyvalerate containing 8 to 15 mol % of D-hydroxyvalerate-derived monomer unit and 60 to 15% by weight of poly-ε-caprolactone, and 5 to 40 volume % of an inorganic filler or fillers.
Claim 3
Dependent Claim
100 words
A porous film which comprises of 95 to 60 volume % of a resin mixture of 40 to 85% by weight of a copolymer between D-hydroxybutyrate and D-hydroxyvalerate containing 8 to 15 mol % of D-hydroxyvalerate-derived monomer unit and 60 to 15% by weight of poly-ε-caprolactone, and 5 to 40 volume % of an inorganic filler or fillers, and having a void volume of 10 to 70% measured in accordance with the formula ##EQU2## wherein d 0 is the specific gravity of film before being rendered porous, and d 1 is the specific gravity of film after being rendered porous.
Claim 4
Dependent Claim
100 words
A porous film which comprises of 95 to 60 volume % of a resin mixture of 40 to 85% by weight of a copolymer between D-hydroxybutyrate and D-hydroxyvalerate containing 8 to 15 mol % of D-hydroxyvalerate-derived monomer unit and 60 to 15% by weight of poly-ε-caprolactone, and 5 to 40 volume % of an inorganic filler or fillers, and having a void volume of 10 to 70% measured in accordance with the formula ##EQU2## wherein d 0 is the specific gravity of film before being rendered porous, and d 1 is the specific gravity of film after being rendered porous.
Claim 5
Dependent Claim
87 words
A process for producing a porous film described in claim 2, which comprises melting a resin composition which comprises of 95 to 60 volume % of a resin mixture of 40 to 85% by weight of a copolymer between D-hydroxybutyrate and D-hydroxyvalerate containing 8 to 15 mol % of D-hydroxyvalerate-derived monomer unit and 60 to 15% by weight of poly-ε-caprolactone, and 5 to 40 volume % of an inorganic filler or fillers, forming it into a film, and stretching the resulting film in at least one direction.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-11-06 | 1999-05-08 | 1999-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-11-06 | 2003-05-08 | 2003-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-11-06 | 2007-05-08 | 2007-11-07 | $7700.00 | Window Closed / Lapsed |