Patents Represented by Attorney H. L. Greenwald

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  • Acrylamide copolymer thickener for aqueous systems
    Patent number: 4395524
    Abstract: Nonionic and anionic water-soluble addition copolymers of acrylamide and N-substituted acrylamides are useful as flow modifiers in and as adsorbates from aqueous systems, particularly multiphase systems. The copolymers have a weight average molecular weight greater than 30,000 and are useful for many purposes including as thickening agents or rheology modifiers for water based systems, block improvement additives in water based coating formulations, and transfer aids in water based ink or roll coater formulations.
    Type: Grant
    Filed: April 10, 1981
    Date of Patent: July 26, 1983
    Assignee: Rohm and Haas Company
    Inventors: William D. Emmons, Travis E. Stevens