Biodegradable composite polymeric articles comprising polyvinyl

Details Biodegradable composite polymeric articles comprising polyvinyl Biodegradable composite polymeric articles comprising polyvinyl

1994-10-31

1998-08-25

Le, H. Thi

Stock material or miscellaneous articles

Hollow or container type article

264514, 264515, 264519, 425 352, 425 354, 425366, 425212, 425213, 425217, 425220, 425913, B32B 702, B29C 4514

Patent

active

057981523

ABSTRACT:
Composite polymeric articles, which may be in layer or film form, comprise a larger portion of a polymer which is water soluble at 20.degree. C. against a smaller proportion of a polymer which is substantially water-insoluble at that temperature. For example, a layer product may have a thin layer (e.g. less than 5 microns) of insoluble polymer superimposed on a thicker layer (e.g. at least 20 microns) of soluble polymer. Both polymers are conveniently polyvinyl alcohol, which is non-toxic and useful in a number of domestic applications, e.g. as a diaper backing sheet. The insoluble portion gives water resistance but negligible mechanical strength; the soluble part gives the mechanical strength. On dissolution of the soluble portion, the insoluble portion disintegrates mechanically. Articles may be made by co-extrusion or by molding.

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