Patent ID: 6627751
Filing Date: 2003-09-30
Classification: C08B

Abstract:
A hydrophobically modified anionic cellulose ether obtainable by a process comprising reacting an alkali metal cellulose with at least three alkylating reagents A, B, and C,one or more reagents A being a haloacetic acid, alkali metal haloacetate, alkali metal vinyl sulfonate, or vinyl sulfonic acid, one or more reagents B having the formula R1â€”(OCH2CH(R2))nâ€”P wherein R1 represents a C2-C7 group, R2 is hydrogen or a methyl group, n is 0-2, and P represents a glycidyl ether group, a 3-halo-2-hydroxypropyl ether group, a 1,2-epoxy group, or a halide, andone or more reagents C having the formula R3â€”(OCH2CH(R2))mâ€”P wherein R3 represents a C8-C30 group, m is 0-10, and R2 and P have the meaning as described above; andwherein the alkali metal cellulose is reacted first with reagent B followed by reaction with reagent C or the alkali metal cellulose is reacted first with a mixture of reagents B and C.