C - Chemistry – Metallurgy – 08 – B
Patent
C - Chemistry, Metallurgy
08
B
260/210.1
C08B 15/05 (2006.01) C08B 11/20 (2006.01)
Patent
CA 1190222
ABSTRACT The present invention relates to cellulose ethers which can be dispersed in aqueous media and to a process for preparing them by reacting water-soluble cellulose ethers with a modifying agent. The modifying agent is a silanc, R-R4, in which R is of the formula -IMAGE- and wherein R1 is alkyl having from 1 to 4 carbon atoms, alkenyl having from 1 to 4 carbon atoms or carbocyclic aryl having one or two 6-membered rings, having up to 15 carbon atoms (including aliphatic side groups) and optionally being ring substituted by a member selected from the group consisting of chloro, bromo, alkoxy having from 1 to 4 carbon atoms, carbocyclic aryloxy having one or two 6-membered rings and up to 15 carbon atoms (including aliphatic side groups) and phenyl; R2 is -H, one of the meanings of R1 or one of the meanings of R4; R3 is one of the meanings of R2; and R4 is alkoxy having from 1 to 4 carbon atoms and being optionally substituted by a member selected from the group consisting of alkoxy having from 1 to 4 carbon atoms and carbocyclic aryloxy having one or two 6-membered rings and up to 15 carbon atoms (including aliphatic side groups); aryloxy having one or two 6-membered rings and up to 15 carbon atoms (including aliphatic side groups) and optionally being substituted by a member selected from the group consisting of alkoxy having from 1 to 4 carbon atoms and aryloxy having one or two 6-membered rings and up to 15 carbon atoms (including aliphatic side groups); aliphatic carboxylic and acyloxy having up to 5 carbon atoms, aromatic carboxylic acid acyloxy having one or two 6-membered carbocyclic rings and up to 16 carbon atoms; 0-R; or N1-1-R. The modified cellulose others can be worked into aqueous media of a broad pH range (from strongly acidic to strongly alkaline) without lump formation, the viscosity build-up of which can be precisely adjusted and controlled by simple technical means during and after the working-in phase where they are dispersed, and which (even by addition of small amounts of an appropriate modifying agent) can be converted into reversible types of modification.
435748
Berenbold Helmut
Felcht Utz-Hellmuth
Clariant Gmbh
Fetherstonhaugh & Co.
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