Hercules Corporation

Vtip Intellectual Properties, Inc.

Daiqiang Xu

Osama M Musa

Kevin Edgar

Todd Andrew Brugel

Xueyan Zheng

The present invention provides novel hybrid polymers having unique physical properties. The hybrid polymers comprise a cellulose ether moiety, a linking group moiety, a spacer group moiety, and a lactam moiety. The present invention also provides compositions comprising the hybrid polymers and methods for preparing and using the hybrid polymers. In a first embodiment, the hybrid polymers have the structure:A-(L-S&#x2014;(B))wherein A is derived from a cellulose ether moiety comprising a &#x2014;OH group; Lis a linking group moiety selected from the group consisting of urethanes, amides, esters, carbonates, and phosphate esters, or is derived from a moiety selected from the group consisting of anhydrides, cyclic ethers, and aziridines; S is a spacer group moiety, selected from the group consisting of straight- or branched-chain functionalized and unfunctionalized alkyl, cycloalkyl, alkenyl, and aryl groups, wherein any of the above groups may be with or without heteroatoms, or is a direct bond; and B is a lactam moiety; wherein k&#x2265;1 and q&#x2265;1. In a second embodiment, the hybrid polymers have the structure:A-(L-S&#x2014;B)wherein A is derived from a cellulose ether moiety comprising a &#x2014;OH group; Lis an ether linking group moiety; S is a spacer group moiety, selected from the group consisting of straight- or branched-chain functionalized and unfunctionalized alkyl, cycloalkyl, alkenyl, and aryl groups, wherein any of the above groups may be with or without heteroatoms, or is a direct bond; and B is a lactam moiety; wherein y&#x2265;1; with the proviso that when the cellulose ether moiety is hydroxyethyl cellulose, -(L-S&#x2014;B)is not derived from 1-(hydroxymethyl)-2-pyrrolidinone.

Cellulose ether-lactam hybrid polymers, compositions, and methods for preparing and using the hybrid polymers

Embodiments of the invention provide regioselectively substituted carbohydrate and polysaccharide derivatives, such as cellulose esters, and methods for preparing them. Particular methods of the invention include deacylation of esters using tetrabutylammonium fluoride to obtain selective substitution at desired hydroxyl position(s) of the ester. Preferred is deacylation of an ester, which shows selectivity for removal of acyl groups from the ester of the secondary alcohols at C-2 and C-3, and which affords cellulose-6-O-esters with high regioselectivity by a simple one-step process employing no protective groups. Inventive regioselectively substituted cellulose esters can be prepared by such methods to obtain esters with the following anhydroglucose repeating units: 

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Newark, DE, United States of America

Daiqiang Xu