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US 4,376,199 AGranted
Shaped material of chitin derivatives
AssigneeKureha Kagaku Kogyo Kabushiki Kaisha
InventorJunichi Koshugi
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Abstract
Disclosed herein is a novel shaped material of a derivative of chitin obtainable by partially acylating or partially acid-treating a cross-linked ionic chitin derivatives, which is excellent for use as the material for capsules, as material for dialysis carriers and/or as an ion-exchanger resin.
Claims3
A shaped material of a chitin derivative having a surface layer consisting essentially of chitin derivative obtained by acylation or acid-treatment of a 3,6' or 3,N,6' cross-linked ionic chitin-derivative of which the main structural unit is represented by the formula:
- ##STR7## wherein R.sup.1 represents a hydrogen atom, --C.sub.n H.sub.2n+1 or --(CH.sub.2).sub.n OH;
- R.sup.2 represents a hydrogen atom, --C.sub.n' H.sub.2n'+1, --(CH.sub.2).sub.n OH, --(CH.sub.2).sub.n' CH(OH)CH.sub.2 OH or --(CH.sub.2).sub.n' COOM, wherein n is an integer of 1 to 20, n' is an integer of 1 to 3 and M represents a hydrogen atom, an alkali metal atom or an atomic equivalent amount of an alkaline earth metal, or a de-N-acylated acyl chitin having an acyl group of --CO(CH.sub.2).sub.n-1 CH.sub.3 and which is cross-linked at a rate of 0.01 to 0.3 per pyranose ring.
Dependencies are inferred from the claim text.