US5384187A
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Biodegradable resin compositions and laminates based thereon
Assignee: Mitsubishi Chemical Corp
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Filing: 1992-05-15
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Granted: 1995-01-24
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Expires: 2012-05-15
Abstract
Abstract PCT No. PCT/JP92/00633 Sec. 371 Date Jan. 11, 1993 Sec. 102(e) Date Jan. 11, 1993 PCT Filed May 15, 1992 PCT Pub. No. WO92/20739 PCT Pub. Date Nov. 26, 1992.A biodegradable resin composition including a saponified ethylene-vinyl acetate copolymer and a starch-based macromolecular substance. The saponified ethylene-vinyl acetate copolymer is one having an ethylene content of 20 to 60 mole %, a vinyl acetate saponification degree of not less than 90 mole %, a melt flow index of 1 to 100 g/10 min as measured under a load of 2160 g at 210 DEG C., and a melt viscosity ratio eta 60/ eta 5 of 0.5 to 4 where eta 60 means the melt viscosity after 60 minutes of standing at 250 DEG C. and the eta 5 means the melt viscosity after 5 minutes of standing at 250 DEG C. and a starch-based macromolecular substance. A layer of the above composition can be used to fabricate a laminate with a substrate material of a different kind, such as a photodegradable polymer.
Inventors
- 👤 Tomoyoshi Uemura
- 👤 Yoshimi Akamatsu
- 👤 Yuichi Yoshida
- 👤 Yoshikazu Moriwaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:53
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B25/00; B32B25/04; B32B25/08; B32B25/12; B32B27/18; B32B27/22; B32B27/30; B32B27/306; B32B27/32; C; C08; C08L; C08L29/00; C08L29/02; C08L29/04; C08L3/00; C08L3/02; B32B2307/00; B32B2307/70; B32B2307/716; B32B2307/7163; B32B2307/718; C08L2201/00; C08L2201/06; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906; Y10T428/31909; Y10T428/31913; Y10T428/31928; Y10T442/00; Y10T442/20; Y10T442/2025
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
190 words
A biodegradable resin composition comprising a saponified ethylene-vinyl acetate copolymer having an ethylenevinyl acetate copolymer having an ethylene content of 20 to 60 mole a vinyl acetate saponification degree of not less than 90 mole a melt flow index of 1 to 100 g/10 min as measured under a load of 2160 g at 210° C., and a melt viscosity ratio of ηη 60 /η 5 of 0.8 to 2.5 where η 60 means the melt viscosity after 60 minutes of standing at 250° C. and the η 5 means the melt viscosity after 5 minutes of standing at 250° C. and a starch-based macromolecular substance, wherein said saponified ethylene-vinyl acetate copolymer and said starch-based macromolecular substance occur in a ratio of 80:20 through 20:80 and wherein one of said saponified ethylene-vinyl acetate copolymer and said starch-based macromolecular substance is fed to an extruder via its main feeder and melted in the extruder and the other is fed in a molten state to the extruder via a side feeder, and said saponified ethylene-vinyl acetate copolymer and said starch-based macromolecular substance are blended together in a molten state in the extruder.
Claim 2
Dependent Claim
190 words
A biodegradable resin composition comprising a saponified ethylene-vinyl acetate copolymer having an ethylenevinyl acetate copolymer having an ethylene content of 20 to 60 mole a vinyl acetate saponification degree of not less than 90 mole a melt flow index of 1 to 100 g/10 min as measured under a load of 2160 g at 210° C., and a melt viscosity ratio of ηη 60 /η 5 of 0.8 to 2.5 where η 60 means the melt viscosity after 60 minutes of standing at 250° C. and the η 5 means the melt viscosity after 5 minutes of standing at 250° C. and a starch-based macromolecular substance, wherein said saponified ethylene-vinyl acetate copolymer and said starch-based macromolecular substance occur in a ratio of 80:20 through 20:80 and wherein one of said saponified ethylene-vinyl acetate copolymer and said starch-based macromolecular substance is fed to an extruder via its main feeder and melted in the extruder and the other is fed in a molten state to the extruder via a side feeder, and said saponified ethylene-vinyl acetate copolymer and said starch-based macromolecular substance are blended together in a molten state in the extruder.
Claim 3
Dependent Claim
30 words
The biodegradable resin composition of claim 1 wherein the saponified ethylene-vinyl acetate copolymer is a hydrous saponified ethylene-vinyl acetate copolymer having a water content of 20 to 60 weight %.
Claim 4
Dependent Claim
23 words
The biodegradable resin composition of claim 1 which contains a plasticizer in addition to said saponified ethylene-vinyl acetate copolymer and starch-based macromolecular substance.
Claim 5
Dependent Claim
40 words
The biodegradable resin composition of claim 1 wherein the plasticizer is a polyhydric alcohol containing 2 to 4 hydroxyl groups and having a melting point of not lower than 40° C. and a molecular weight of not more than 600.
Claim 6
Dependent Claim
217 words
A laminate comprising a layer composed of a biodegradable resin composition comprising a saponified ethylenevinyl acetate copolymer having an ethylene content of 20 to 60 mole % a vinyl acetate saponification degree of not less than 90 mole %, a melt flow index of 1 to 100 g/10 min as measured under a load of 2160 g at 210° C., and a melt viscosity ratio η 60 /η 5 of 0.8 to 2.50 where η 60 means the melt viscosity after 60 minutes of standing at 250° C. and η 5 means the melt viscosity after 5 minutes of standing at 250° C. and a starch-based macromolecular substance, wherein said saponified ethylene-vinyl acetate copolymer and said starch-based macromolecular substance occur in a ratio of 80:20 through 20:80 and wherein one of said saponified ethylene-vinyl acetate copolymer and said starch-based macromolecular substance is fed to an extruder via its main feeder and melted in the extruder and the other is fed in a molten state to the extruder via a side feeder, and said saponified ethylene-vinyl acetate copolymer and said starch-based macromolecular substance are blended together in a molten state in the extruder and a layer of substrate material selected from the group consisting of a thermoplastic resin, paper, woven cloth, nonwoven cloth, metal, foil and wood board.
Claim 7
Dependent Claim
217 words
A laminate comprising a layer composed of a biodegradable resin composition comprising a saponified ethylenevinyl acetate copolymer having an ethylene content of 20 to 60 mole % a vinyl acetate saponification degree of not less than 90 mole %, a melt flow index of 1 to 100 g/10 min as measured under a load of 2160 g at 210° C., and a melt viscosity ratio η 60 /η 5 of 0.8 to 2.50 where η 60 means the melt viscosity after 60 minutes of standing at 250° C. and η 5 means the melt viscosity after 5 minutes of standing at 250° C. and a starch-based macromolecular substance, wherein said saponified ethylene-vinyl acetate copolymer and said starch-based macromolecular substance occur in a ratio of 80:20 through 20:80 and wherein one of said saponified ethylene-vinyl acetate copolymer and said starch-based macromolecular substance is fed to an extruder via its main feeder and melted in the extruder and the other is fed in a molten state to the extruder via a side feeder, and said saponified ethylene-vinyl acetate copolymer and said starch-based macromolecular substance are blended together in a molten state in the extruder and a layer of substrate material selected from the group consisting of a thermoplastic resin, paper, woven cloth, nonwoven cloth, metal, foil and wood board.
Claim 8
Dependent Claim
46 words
The laminate of claim wherein said substrate material is a layer of at least one photodegradable polymer selected from the group consisting of ethylene-CO copolymer, ethylene-vinyl ketone copolymer, polybutadiene and isoprene rubber or a polyolefinic photodegradable polymer containing at least one of said polymers as blended.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-01-23 | 1998-07-25 | 1999-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-23 | 2002-07-25 | 2003-01-24 | $3760.00 | Window Closed / Lapsed |
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