Alkali-resistant core-shell polymers
AssigneeRohm and Haas Company
InventorsDennis P. Lorah, Mark S. Frazza
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Abstract
Alkali-resistant core-shell polymers having an acid-insoluble core and an acid-soluble shell are prepared by sequential emulsion polymerization of a monomer mixture having acid-ionizable functionality such that the resulting polymer has an acid-insoluble core and an acid-soluble shell. Films from these alkali-resistant, core-shell polymers are resistant to high pH environments where alkali-resistance is required. The alkali-resistant, core-shell polymers are useful in applications such as inks, clear overprint varnishes, coatings, metal adhesion, fiber treatment, paper treatment, cathodic deposition coatings, stain blocking, coagulants and flocculants.
Claims28
A composition comprising a core-shell polymer having an acid-insoluble polymer core and an acid-soluble or quaternizable polymer shell, wherein said shell and said core are prepared sequentially by emulsion polymerization, wherein said core having an average molecular weight of greater than about 8,000 and said shell having a weight average molecular weight of about 5,000 to about 100,000, and wherein the ratio of said core to said shell is about 85:15 to about 15:85.
Dependencies are inferred from the claim text.