US5489474A
Expired / Lapsed
US
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Degradable adhesive film and degradable resin composition
Assignee: Mitsui Chemicals Inc
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Filing: 1993-08-30
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Granted: 1996-02-06
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Expires: 2013-08-30
Abstract
Abstract Articles which can be degraded and disappear in the natural environment are a degradable adhesive film which can be used for surface protection or indication after printing on the film surface and has an adhesive layer on one side of a substrate film obtained from a lactic acid base polymer such as polylactic acid and a lactic acid/hydroxycarboxylic acid copolymer having a molecular weight of 30,000-500,000, and a degradable resin composition which is excellent in weatherability and comprises 100 parts by weight of a lactic acid base polymer and 0.001-5 parts by weight of one or more additives selected from ultraviolet absorbers and light stabilizers.
Inventors
- 👤 Hosei Shinoda
- 👤 Masami Ohtaguro
- 👤 Shigeru Iimuro
- 👤 Akihiro Funae
- 👤 Shinobu Moriya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:33
CPC Classifications
C; C09; C09J; C09J7/00; C08; C08K; C08K5/00; C08K5/0008; C08K5/005; C09J7/20; C09J7/22; C09J7/25; C09J7/255; C08K5/04; C08K5/13; C08K5/132; C08K5/16; C08K5/34; C08K5/3467; C08K5/3472; C08K5/3475; C08L; C08L2205/00; C08L2205/02; C08L67/00; C08L67/04; C09J2203/00; C09J2203/306; C09J2301/00; C09J2301/40; C09J2301/41; C09J2467/00; C09J2467/006; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2852
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
104 words
A degradable adhesive film comprising a substrate film obtained from a lactic acid base polymer and an adhesive layer on one side of the substrate film, wherein the substrate film comprises 0.001˜5 parts by weight of at least one additive selected from the group consisting of an ultraviolet absorber and a light stabilizer for 100 parts by weight of the lactic acid base polymer, and the adhesive layer comprises an adhesive and 0.01˜20 parts by weight of a crosslinking agent selected from the group consisting of epoxy based resins, melamine based resins and aziridine based resins for 100 parts by weight of the adhesive.
Claim 2
Dependent Claim
104 words
A degradable adhesive film comprising a substrate film obtained from a lactic acid base polymer and an adhesive layer on one side of the substrate film, wherein the substrate film comprises 0.001˜5 parts by weight of at least one additive selected from the group consisting of an ultraviolet absorber and a light stabilizer for 100 parts by weight of the lactic acid base polymer, and the adhesive layer comprises an adhesive and 0.01˜20 parts by weight of a crosslinking agent selected from the group consisting of epoxy based resins, melamine based resins and aziridine based resins for 100 parts by weight of the adhesive.
Claim 3
Dependent Claim
32 words
A degradable adhesive film of claim 1 wherein the lactic acid base polymer is one or more polymers selected from the group consisting of polylactic acid and a lactic acid/hydroxycarboxylic acid copolymer.
Claim 4
Dependent Claim
19 words
A degradable adhesive film of claim 1 wherein the lactic acid base polymer has a molecular weight of 30,000˜500,000.
Claim 5
Dependent Claim
49 words
A degradable adhesive film of claim 2 wherein the polylactic acid is one or more polymers selected from the group consisting of poly(L-lactic acid) or poly(DL-lactic acid) having 50˜100% by mole of L-lactic acid units and poly(D-lactic acid) or poly(DL-lactic acid) having 50˜100% by mole of D-lactic acid units.
Claim 6
Dependent Claim
67 words
A degradable adhesive film of claim 2 wherein the lactic acid/hydroxycarboxylic acid copolymer is one or more polymers selected from the group consisting of a lactic acid/glycolic acid copolymer having 30˜98% by mole of lactic acid units and 70˜2% by mole of glycolic acid units, and a lactic acid/hydroxycaproic acid copolymer having 10˜98% by mole of lactic acid units and 90˜2% by mole of hydroxycaproic acid units.
Claim 7
Dependent Claim
60 words
A degradable adhesive film of claim 1 wherein the substrate film comprises 1˜50 parts by weight of one or more plasticizers selected from the group consisting of glycerol triacetate, lactic acid, a lactic acid oligomer having polymerization degree of 2˜10, and lactide for 100 parts by weight of the lactic acid base polymer. weight of the lactic acid base polymer.
Claim 8
Dependent Claim
35 words
A degradable adhesive film of claim 1 wherein the additives are one or more compounds selected from the group consisting of benzophenones including 2-hydroxy-4-n-octoxybenzophenone and 4-dodecyloxy-2-hydroxybenzophenone, benzotriazoles including 2-(2'-hydroxy-5'-methylphenyl)benzotriazole and 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)benzotriazole, and sebacates including bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate.
Claim 9
Dependent Claim
37 words
A degradable adhesive film of claim 1 wherein the adhesive is one or more compounds selected from the group consisting of a natural rubber based adhesive, a synthetic rubber based adhesive and a synthetic resin based adhesive.
Claim 10
Dependent Claim
19 words
A degradable adhesive film of claim 8 wherein the synthetic resin based adhesive is an acrylic resin based adhesive.
Claim 11
Dependent Claim
27 words
A degradable adhesive film of claim 9 wherein the acrylic resin is a copolymer comprising an acrylic acid alkyl ester and a monomer having a carboxyl group.
Claim 12
Dependent Claim
19 words
A degradable adhesive film of claim 1 wherein one or both sides of substrate film are printed or painted.
References Cited (Backward Citations)
US3527841A
Cited
JPS4936597A
Cited
EP0153104A2
Cited
JPS6110242A
Cited
JPS62501611A
Cited
US4742140A
Cited
US5094912A
Cited
JPH02107684A
Cited
JPH02300281A
Cited
EP0426055A2
Cited
EP0435080A1
Cited
US5076983A
Cited
US5272221A
Cited
US5238968A
Cited
US5296282A
Cited
US5206341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-05 | 1999-08-07 | 2000-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-05 | 2003-08-07 | 2004-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-05 | 2007-08-07 | 2008-02-06 | $7700.00 | Window Closed / Lapsed |