Patents Represented by Attorney Richard E. Silverman

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  • Water-soluble or water-swellable crosslinked copolymers
    Patent number: 6891009
    Abstract: Water-soluble or water-swellable crosslinked copolymers consisting essentially of structural units of the formula 1 or a mixture of the structural units of the formula 1 with structural units of the formula 2 and structural units of the formula 3 where R, R1, R2, R3, Z and n are as defined in the description. These copolymers are crosslinked with compounds which contain at least two olefinic double bonds. These crosslinked copolymers are suitable as thickeners, in particular for cosmetic and pharmaceutical preparations.
    Type: Grant
    Filed: September 26, 2003
    Date of Patent: May 10, 2005
    Assignee: Clariant GmbH
    Inventors: Matthias Löffler, Roman Morschhäuser