Cellulosic materials having composite crystalline structure
AssigneeSK Chemicals Co., Ltd.
InventorsIk Soo Kim, Jong Soo An, Byung Hak Kim
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Abstract
Disclosed is a novel rayon fiber which possesses characteristics similar to those of a viscose rayon fiber as to be suitable for use in clothes in addition to being produced at an economical cost. The rayon fiber is prepared from a cellulose acetate fiber with a degree of substitution of 2.0 or higher by saponifying 75% or greater of the total acetyl groups of the cellulose acetate fiber into hydroxyl groups and has a composite crystalline structure of cellulose II and IV.
Claims30
A method for preparing a rayon fiber, comprising the step of treating a cellulose acetate fiber with an alkali to saponify at least 75% of the total acetyl groups of the cellulose acetate fiber into hydroxyl groups, whereby the rayon fiber has a composite crystalline structure of cellulose II and IV.
A method for preparing a rayon fiber, comprising the step of treating a fiber material comprising cellulose acetate fibers with an alkali to saponify 75% or greater of the total acetyl groups of the cellulose acetate fibers into hydroxyl groups, said fiber material being selected from the group consisting of a woven fabric, a knitted fabric, and a non-woven fabric, whereby the rayon fiber has a composite crystalline structure of cellulose II and IV.
A rayon fiber product, comprising a rayon fiber which possesses a composite crystalline structure of cellulose II and IV and is prepared by saponifying at least 75% of the total acetyl groups of a cellulose acetate fiber with a degree of substitution of at least 2.0 into hydroxyl groups.
A method for producing a rayon fiber product, comprising the step of treating a fiber material comprising cellulose acetate fibers with an alkali to saponify at least 75% of the total acetyl groups of the cellulose acetate fibers into hydroxyl groups, said fiber material being selected from the group consisting of a woven fabric, a knitted fabric, and a non-woven fabric, said cellulose acetate fibers having a degree of substitution of at least 2.0, whereby the rayon fiber product has a composite crystalline structure of cellulose II and IV.
A rayon film, which is prepared from a cellulose acetate film with a degree of substitution of at least 2.0 by saponifying at least 75% of the total acetyl groups of the film into hydroxyl groups and possesses a composite crystalline structure of cellulose II and IV.
A method for producing a rayon film, comprising the step of treating a cellulose acetate film with an alkali to saponify at least 75% of the total acetyl groups of the cellulose acetate film into hydroxyl groups, whereby the rayon film has a composite crystalline structure of cellulose II and IV.
Dependencies are inferred from the claim text.