Thermoplastic starch for use in melt-extruded substrates

Details Thermoplastic starch for use in melt-extruded substrates Thermoplastic starch for use in melt-extruded substrates

2011-08-16

2011-08-16

Torres-Velazquez, Norca L (Department: 1786)

Fabric (woven, knitted, or nonwoven textile or cloth, etc.)

Nonwoven fabric

Nonwoven fabric with a preformed polymeric film or sheet

C442S381000, C442S414000, C428S532000, C524S047000, C524S394000

Reexamination Certificate

active

07998888

ABSTRACT:
A melt-extruded substrate (e.g., film, nonwoven web, etc.) that contains a thermoplastic starch formed from a starch and plasticizer is provided. The starch and plasticizer are melt blended together in the presence of a weak organic acid (e.g., lactic acid, formic acid, acetic acid, etc.). By selectively controlling certain parameters of the melt blending process (e.g., extrusion temperature, content of the components, etc.), the present inventors have discovered that the starch may be hydrolyzed in a highly efficient manner to form compositions having a comparably lower weight average molecular weight, polydispersity index, and viscosity, which are particularly suitable for use in the formation of melt-extruded substrates.

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