US6146750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bio-degradable resin composition, film and shaped article
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1995-01-24
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Granted: 2000-11-14
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Expires: 2015-01-24
Abstract
Abstract The disclosed composition contains a biodegradable resin, and an inorganic laminar compound having an aspect ratio of not less than 50 and not more than 5000. A biodegradable film or shaped article includes, as at least a portion thereof, a layer (1) found from this biodegradable resin composition. The biodegradable resin composition, film or shaped article can exhibit a good gas barrier property while substantially retaining the desired biodegradability. Therefore, it can considerably contribute to the maintenance or protection of a terrestrial environment such as the disposal of trash or rubbish, or plastic wastes; and the reduction in the amount of wastes in landfills.
Inventors
- 👤 Kozo Kotani
- 👤 Toshio Kawakita
- 👤 Taiichi Sakaya
- 👤 Toshiya Kuroda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:43
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/18; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B27/36; C; C08; C08J; C08J7/00; C08J7/04; C08J7/042; C08J7/0423; C08J7/048; C08K; C08K3/00; C08K3/34; C08K3/346; B32B2307/00; B32B2307/70; B32B2307/716; B32B2307/7163; B32B2307/724; B32B2307/7242; B32B2307/7244; C08K2201/00; C08K2201/008; C08K2201/016; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1341; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/25; Y10T428/251; Y10T428/31504; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31935; Y10T428/31971
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
165 words
A biodegradable resin film having at least two layers having: a first biodegradable layer comprising the composition which comprises: a biodegradable resin which is capable of being biodegraded by the action of a microorganism, said biodegradable resin is a hydrogen-bonded resin wherein said hydrogen-bonded resin has 10% to 60% by weight of hydrogen-bonding groups selected from the group consisting of hydroxyl groups, amino groups, amide groups and thiol groups, and an inorganic laminar compound having aspect ratio (Z) of from 100 to 3000, wherein the aspect ratio (Z) is defined by the equation (Z)=L/(a), wherein L represents the particle diameter of the inorganic laminar compound measured in a solvent by a dynamic light scattering method, and (a) represents the unit thickness of the inorganic laminar compound measured by powder x-ray diffraction, and wherein said inorganic laminar compound is swollen or cleft in a solvent; and a second biodegradable layer comprising a material selected from the group consisting of polyester poly-3-hydroxybutyrate, 3-hydroxybutyrate-3-hydroxyvalerate copolymers, chitin, and chitosan.
Claim 2
Dependent Claim
165 words
A biodegradable resin film having at least two layers having: a first biodegradable layer comprising the composition which comprises: a biodegradable resin which is capable of being biodegraded by the action of a microorganism, said biodegradable resin is a hydrogen-bonded resin wherein said hydrogen-bonded resin has 10% to 60% by weight of hydrogen-bonding groups selected from the group consisting of hydroxyl groups, amino groups, amide groups and thiol groups, and an inorganic laminar compound having aspect ratio (Z) of from 100 to 3000, wherein the aspect ratio (Z) is defined by the equation (Z)=L/(a), wherein L represents the particle diameter of the inorganic laminar compound measured in a solvent by a dynamic light scattering method, and (a) represents the unit thickness of the inorganic laminar compound measured by powder x-ray diffraction, and wherein said inorganic laminar compound is swollen or cleft in a solvent; and a second biodegradable layer comprising a material selected from the group consisting of polyester poly-3-hydroxybutyrate, 3-hydroxybutyrate-3-hydroxyvalerate copolymers, chitin, and chitosan.
Claim 3
Dependent Claim
62 words
A biodegradable resin film according to claim 1, wherein the composition has a relative ratio of the integrated intensity of the standard diffraction peak corresponding to the lattice spacing a to that of the diffraction peak corresponding to the lattice spacing d of 2 or more, wherein both the diffraction peaks are observed in the powder X-ray diffraction of the resin composition.
Claim 4
Dependent Claim
25 words
A biodegradable resin film according to claim 1, wherein the biodegradable resin a resin comprising a polyvinyl alcohol or a polysaccharide as a main component.
Claim 5
Dependent Claim
27 words
A biodegradable resin film according to claim 1, wherein the inorganic laminar compound is an inorganic laminar compound having a particle diameter of 5 μm of smaller.
Claim 6
Dependent Claim
21 words
A biodegradable resin film according to claim 1, wherein the inorganic laminar compound comprises a clay mineral having a swelling property.
Claim 7
Dependent Claim
23 words
A biodegradable resin film according to claim 1, wherein the biodegradable resin comprises a polyester producible by a microorganism as a main component.
Claim 8
Dependent Claim
20 words
A biodegradable resin film according to claim 1, wherein the biodegradable resin comprises a biodegradable polyester as a main component.
Claim 9
Dependent Claim
36 words
A biodegradable resin film according to claim 1, wherein the biodegradable resin film has, an oxygen permeability of not more than 0.2 cc/m 2 •day•atm under the conditions of 30° C. and 60% RH (relative humidity).
Claim 10
Dependent Claim
12 words
A shaped article comprising a biodegradable resin film according to claim 1.
Claim 11
Dependent Claim
17 words
A biodegradable resin film according to claim 1, wherein the biodegradable resin is poly-3-hydroxybutyrate or 3-hydroxybutyrate-3-hydroxyvalerate copolymer.
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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) | 2003-11-14 | 2004-05-15 | 2004-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-11-14 | 2008-05-15 | 2008-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-11-14 | 2012-05-15 | 2012-11-14 | $7700.00 | Window Closed / Lapsed |