Reversibly crosslinked cellulose ethers and process for the production thereof by selective oxidation of vicinal OH groups

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United States of America Patent

PATENT NO 11453729
APP PUB NO 20160215069A1
SERIAL NO

14991771

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Abstract

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Reversibly crosslinked, water-soluble cellulose ethers having at least two different ether components is disclosed. At least one ether component is an alkyl, hydroxyalkyl or carboxymethyl group and at least one is an alkyl group having an aldehyde function which forms hydrolyzable hemiacetals with free OH groups of the cellulose ether. The cellulose ethers are obtainable by selective oxidation of cellulose ethers containing alkyl groups having vicinal OH groups (glycol cleavage). Preferably, water-soluble cellulose ethers are co-etherified simultaneously or subsequently with 2,3-epoxypropanol (glycidol) or 3-chloro-1,2-propanediol and the 2,3-dihydroxypropyl ether groups converted entirely or partly into 2-oxoethyl ether groups by oxidation. Suitable oxidants include periodate, periodic acid or lead tetraacetate. After washing and drying, cellulose ethers reversibly crosslinked via hemiacetals can be dispersed in water or aqueous solutions, going into solution homogeneously with a time delay. No low molecular weight dialdehydes or other problematical crosslinking reagents are liberated on dissolution.

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Patent Owner(s)

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SE TYLOSE GMBH & CO KGKASTELER STR 45 WIESBADEN 65203

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ehrler, Rudolf Flörsheim, DE 7 60
Kleinert, Mike Mainz, DE 9 27
Stern, Roland Wiesbaden, DE 8 244

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