C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
117/199, 400/302
C08F 265/00 (2006.01) C08F 2/22 (2006.01) C09D 151/00 (2006.01)
Patent
CA 1237223
PATENT APPLICATION OF Alexander Kowalski and Martin Vogel for SEQUENTIAL HETEROPOLYMER DISPERSION AND A PARTICULATE MATERIAL OBTAINABLE THEREFROM, USEFUL IN COATING COMPOSITIONS AS AN OPACIFYING AGENT Abstract of the Disclosure 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 base is at least partially encased in a "sheath" polymer that is permeable to an acid, such as acetic acid, adapted to cause swelling of the core by neutralization. The aqueous dispersion of the acid-swollen, base-containing core/sheath particles is useful in making water-base coating compositions, microvoids being formed in cores of the swollen particles in the film during the drying thereof. Thus, the heteropolymer dispersion can serve as an opacifying agent in coating compositions, such as water-base paints, as a supplement or replacement of part or all of the pigmentary material or extenders that would otherwise be used in such coating compositions. 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.
448271
Kowalski Alexander
Vogel Martin
Gowling Lafleur Henderson Llp
Rohm And Haas Company
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