Composition for preparing polysaccharide fibers
AssigneeE. I. Du Pont de Nemours and Company
InventorJohn P O'Brien
Life of this patent
Estimating the term…
Abstract
Solutions formed by combining poly(α(1→3) glucan) with CS2 in aqueous alkali metal hydroxide solution have been shown to produce the xanthated form of the poly(α(1→3) glucan). The solutions so formed have been shown to be useful for solution spinning into fiber of poly(α(1→3) glucan) when the spun fiber is coagulated in an acidic coagulation bath. The fibers so produced exhibit desirable physical properties. The poly(α(1→3) glucan) employed was synthesized by fermentation.
Claims8
A process comprising forming a solution by dissolving in a 0.75 to 2 molar aqueous alkali metal hydroxide, CS2, and 5 to 15 percent by weight of the total weight of the resulting solution of poly(α(1→3) glucan) characterized by a number average molecular weight of at least 10,000 Da, causing said solution to flow through a spinneret, forming a fiber thereby;
- and contacting said fiber with an acidic liquid coagulant;
- wherein said process the weight ratio of CS2 to poly(α(1→3) glucan) lies in the range of 0.1 to 1.0.
Dependencies are inferred from the claim text.