Elastic amylose polymers
AssigneeTeepak, Inc.
InventorDouglas J. Bridgeford
Life of this patent
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Abstract
Highly elastic films, filaments, and shaped articles can be prepared from amylose by forming a dispersion or solution of amylose in an appropriate liquid vehicle under conditions in which the molecular conformation of amylose is substantially helical, then forming a shaped article, film, or filament from the dispersion or solution and finally crosslinking the amylose with a crosslinking agent, the crosslinking agent being present in a proportion for providing an average of about 1 crosslink per 500 amylose monomer units to about 1 crosslink per 10 amylose monomer units.
Claims14
A process for forming films, filaments, and shaped articles from amylose and amylose derivatives having improved elasticity which comprises:
- forming a mixture of a liquid vehicle and amylose or amylose derivative under conditions in which the molecular conformation of said amylose or amylose derivative is substantially in the helical form,
- forming said film, filament, or shaped article from said mixture, and
- crosslinking said amylose or amylose derivative while in the helical form with a crosslinking agent, said agent being present in a proportion for providing an average of about 1 crosslink per 500 monomer units of said amylose or amylose derivative to about 1 crosslink per 10 monomer units in said amylose or amylose derivative.
An elastic film which comprises amylose or an amylose derivative in substantially helical conformation crosslinked with an agent to provide crosslink sites in a proportion of from 1 crosslink per 500 monomer units to 1 to 10 monomer units.
Dependencies are inferred from the claim text.