Patent Number: 6,251,959

Title: Chitin derivatives having carboxylated lower alkyl groups as hydrophilic substituents and hydrophobic substituents, and micellar aqueous composition thereof

Abstract: A chitin derivative having a carboxyalkyl group having a polysaccharide backbone, said carboxyalkyl group being represented by the following formula (1): ##STR1## wherein n=1 or above, R.sub.1 stands for an alkyl group represented by (CH.sub.2).sub.p CH.sub.3 with p=1 to 20, an alkylcarbonyl group represented by CO(CH.sub.2).sub.q CH.sub.3 with q=1 to 19, a carboxyalkyl group represented by (CH.sub.2).sub.r COOH with r=1 to 5 or a salt thereof, H, or COCH.sub.3, and R.sub.2 stands for a carboxyalkyl group represented by (CH.sub.2).sub.s COOH with s=1 to 5 or a salt thereof or H; the degree of deacetylation of the N-acetyl group in chitin is 70 to 100%, wherein 100% deacetylation means one deacetylated N-acetyl group per one monosaccharide unit; 10 to 100% of R.sub.1 are selected from alkyl groups (CH.sub.2).sub.p CH.sub.3 and alkylcarbonyl groups CO(CH.sub.2).sub.q CH.sub.3, wherein 100% means one alkyl group (CH.sub.2).sub.p CH.sub.3 or alkylcarbonyl group CO(CH.sub.2).sub.q CH.sub.3 per one monosaccharide unit; not more than 10% of R.sub.1 are carboxyalkyl groups (CH.sub.2).sub.r COOH; 50 to 200% of R.sub.2 are carboxyalkyl groups (CH.sub.2).sub.s COOH, wherein 200% means two carboxyalkyl groups (CH.sub.2).sub.s COOH per one monosaccharide unit; and the molecular weight of the polysaccharide backbone is 150,000 or less.

Inventors: Kawahara; Hiroyuki (Tokyo, JP), Jinno; Shuji (Tokyo, JP), Okita; Yuji (Tokyo, JP)

Assignee: Nippon Suisan Kaisha, Ltd.

International Classification: C08B 37/00 (20060101); C08B 37/08 (20060101); C08L 5/08 (20060101); C08L 5/00 (20060101); C09K 003/00 (); C08B 037/08 ()

Expiration Date: 06/26/2018