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US 5,401,447 AGranted
Process for producing celluose moldings
AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsToshihiko Matsui, Chihiro Yamane
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AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsToshihiko Matsui, Chihiro Yamane
Estimating the term…
A method for producing a cellulose shaped article characterized by causing cellulose dope substantially composed of an alkali soluble cellulose and an aqueous alkali solution having an alkali concentration of 5 to 15% by weight to coagulate in an aqueous acidic solution having a temperature of at least the freezing temperature and less than 20.degree. C., then drawing the resultant solid 1.05 fold to less than 2.0 fold, then performing heat treatment. It is possible to provide a process free from the generation of waste gas and the danger of explosion during the molding process and also free from environmental pollution and it is possible to provide a cellulose shaped article having mechanical properties of the same extent of existing cellulose shaped articles in terms of physical properties.
A method for producing a cellulose shaped article by causing cellulose dope to coagulate in an aqueous acidic solution having a temperature ranging from about the freezing point of said acidic solution to less than 20.degree. C. wherein said dope is substantially composed of an alkali soluble cellulose and an aqueous alkali solution having an alkali concentration of 5 to 15% by weight, and wherein the solubility of the alkali soluble cellulose with respect to said aqueous alkali solution is at least 90%, then drawing the resultant solid 1.05 fold to less than 2.0 fold followed by performing heat treatment on said resultant solid in the presence of a plasticizer to obtain a cellulose shaped article.
Dependencies are inferred from the claim text.