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US5489474A
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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 18:14
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.
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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) | 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 |