Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1996-01-25
1998-05-26
Lee, Helen
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
4283122, 428480, 428497, 428498, 428532, B32B 0326
Patent
active
057561940
ABSTRACT:
Molded products made from gelatinized starch can be made water-resistant by coating with biodegradable polyesters such as poly(beta-hydroxybutyrate-co-valerate) (PHBV), poly(lactic acid) (PLA), and poly(.di-elect cons.-caprolactone) (PCL). Adherence of the two dissimilar materials is achieved through the use of an intervening layer of a resinous material such as shellac or rosin which possesses a solubility parameter (hydrophobicity) intermediate to that of the starch and the polyesters. Coating is achieved by spraying an alcoholic solution of the shellac or rosin onto the starch-based article and subsequently coating with a solution of the polyester in an appropriate solvent. Biodegradable products made by the instant process have utility in the food service industry.
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patent: 5219646 (1993-06-01), Gallagher et al.
patent: 5280055 (1994-01-01), Tomka
patent: 5288318 (1994-02-01), Mayer et al.
patent: 5391423 (1995-02-01), Wnuk et al.
patent: 5512378 (1996-04-01), Bastioli et al.
Hawley's Condensed Chemical Dictionary. 12th Ed. pp. 579-580, 1012.
Lawton John W.
Shogren Randal L.
Fado John D.
Lee Helen
Lipovsky Joseph A.
Silverstein M. Howard
The United States of America as Represented by the Secretary of
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