The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 28, 1984
Filed:
Feb. 25, 1982
Alexander Kowalski, Glenside, PA (US);
Martin Vogel, Jenkintown, PA (US);
Robert M Blankenship, Lansdale, PA (US);
Rohm and Haas Company, Philadelphia, PA (US);
Abstract
The present invention is concerned with the production and use of water-insoluble particulate heteropolymers made by sequential emulsion polymerization in dispersed particles of which a 'core' of a polymeric acid is at least partially encased in a 'sheath' polymer that is permeable to a volatile base, such as ammonia or an organic amine, adapted to cause swelling of the core by neutralization. The aqueous dispersion of the acid-containing core/sheath particles is useful in making water-base coating compositions wherein it may serve as the binder or as a part thereof. In that use, the heteropolymer dispersion serves to provide desirable rheological control of the coating compositions when a volatile base is used to at least partially (to a pH of at least 6) neutralize the heteropolymer. Thus, the heteropolymer dispersion can serve as a thickener, or part thereof in coating compositions, such as water-base paints. For convenience of description herein, the terms 'core', 'sheath', and 'core/sheath polymer' are frequently used to refer to the distinct functional components of the individual polymer particles of the essential 'mode' of the heteropolymers of the present invention even though in actuality, the components of the polymer particles thereof may not have the precise arrangement implied by this terminology.