Biodegradable polyester and natural polymer laminates
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B32B-027/06
B32B-027/08
B32B-027/36
B32B-031/04
B32B-031/30
출원번호
US-0442213
(1999-11-17)
발명자
/ 주소
Doane, William M.
Lawton, Jr., John W.
Shogren, Randal
대리인 / 주소
Coudert Brothers LLP
인용정보
피인용 횟수 :
4인용 특허 :
37
초록▼
Methods of making articles are provided in which a self-supporting structure formed of natural polymer has a self-adherent, moisture resistant thermoplastic film comprising gelatinized starch and a hydroxy-functional polyester on the structure surface. The self-supporting structure preferably is a s
Methods of making articles are provided in which a self-supporting structure formed of natural polymer has a self-adherent, moisture resistant thermoplastic film comprising gelatinized starch and a hydroxy-functional polyester on the structure surface. The self-supporting structure preferably is a starch and polyvinyl alcohol blend in an expanded form. The articles typically do not delaminate even when soaked in water, and are biodegradable.
대표청구항▼
1. A method of preparing a disposable food tray, comprising:providing an expanded, resilient, and compressible article comprising a natural polymer and defining a food receiving surface; contacting the food receiving surface with a thermoplastic film, the film including gelatinized starch and an hyd
1. A method of preparing a disposable food tray, comprising:providing an expanded, resilient, and compressible article comprising a natural polymer and defining a food receiving surface; contacting the food receiving surface with a thermoplastic film, the film including gelatinized starch and an hydroxy-functional polyester having repeating units represented by Formula B: wherein each of R1 and R2 is individually a divalent organic moiety which is predominately hydrocarbon, each R3 is individually hydrogen or lower alkyl, y is a fraction from 0 to 0.5 and x is a fraction from about 0.05 to about 0.4; and applying sufficient pressure and elevated temperature to the thermoplastic film as to adherently affix the film to the food receiving surface and to form a moisture resistant food tray. 2. The method of claim 1 wherein said film additionally includes an hydroxy-functional polyol.3. The method of claim 2 wherein said natural polymer includes a modified starch.4. The method of claim 1 wherein said natural polymer includes a modified starch.5. A method of preparing a laminate, comprising:providing a structure including a natural polymer and defining a surface, contacting the surface with a thermoplastic film, the film including a gelatinized starch, an hydroxy-functional polyol, and an hydroxy-functional polyester having repeating units represented by Formula B: wherein each of R1 and R2 is individually a divalent organic moiety which is predominately hydrocarbon, each R3 is individually hydrogen or lower alkyl, y is a fraction from 0 to 0.5, and x is a fraction from about 0.05 to about 0.4; and adhering the thermoplastic film to the surface. 6. The method as in claim 5 wherein the natural polymer includes gelatinized starch.7. The method as in claim 5 wherein the film is capable of self-adhering to the surface when a sufficient amount of the hydroxy-functional polyester is present therein.8. The method as in claim 5 wherein each of R1 and R2 is:(a) arylene, alkylenearylene, dialkylenearylene, diaryleneketone, diarylenesulfone, diarylenesulfoxide, alkylenecarbonylarylene, alkylenesulfonylarylene, alkylidenediarylene, diarylene oxide, alkyleneoxyarylene, alkylenethioarylene, diarylene sulfide, or diarylenecyanomethane; or, (b) alkylene, dialkyleneketone, dialkylenesulfone, dialkylenesulfoxide, dialkyleneoxide, or dialkylenesulfide. 9. The method as in claim 5 wherein each of R1 and R2 is individually a divalent aromatic moiety selected from the group consisting of m-phenylene, p-phenylene, isopropylidene, diphenylene, biphenylene, biphenylene oxide, methylenediphenylene, biphenylene sulfide, naphthylene, biphenylenecyanomethane, 3,3′-dialkyldiphenylene-isopropylidene, and 3,3′-,4,4′-tetralkyldiphenylene-isopropylidene.10. The method as in claim 5 wherein each of R1 and R2 is individually a divalent aliphatic moiety selected from the group consisting of ethylene, propylene, and butylene.11. The method as in claim 5 wherein each R3 is individually hydrogen or methyl.12. The method as in claim 5 wherein each of R1 and R2 is a divalent aromatic moiety, an aliphatic hydrocarbon divalent moiety, or an aliphatic heteroatomic moiety wherein the heteroatomic moiety is oxygen, sulfur, imino, sulfonyl, carboxyl, carbonyl, or sulfoxyl.13. The method as in claim 5 wherein the natural polymer includes a modified starch.14. The method as in claim 5 wherein the natural polymer is a blend of starch and polyvinylalcohol.15. The method as in claim 5 wherein the structure is in foam form.16. The method as in claim 5 wherein the contacting is by brushing, dipping, spraying, compression molding, co-extruding, or hot roll laminating.17. A method of preparing a laminate, comprising:providing a structure including a natural polymer comprising starch and defining a surface; contacting the surface with a thermoplastic film, the film including gelatinized starch and an hydroxy-functional polyester having repeating units represented by Formula B: wherein each of R1 and R2 is individually a divalent organic moiety which is predominantly hydrocarbon, each R3 is individually hydrogen or lower alkyl, y is a fraction from 0 to 0.5, and x is a fraction from about 0.05 to about 0.4; and, adhering the thermoplastic film to the surface. 18. The method of claim 17 wherein the starch includes a modified starch.19. The method of claim 18 wherein the natural polymer is a blend of the starch and polyvinylalcohol.20. The method as in claim 17 wherein the natural polymer is a blend of the starch and polyvinylalcohol.
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이 특허에 인용된 특허 (37)
Starcevich Bradley K. (Woodstock IL), Biodegradable and water soluble packaging material.
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Bloembergen Steven (South Lyon MI) Narayan Ramani (Okemos MI), Biodegradable moldable products and films comprising blends of starch esters and polyesters.
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