Dispersions for coatings without external crosslinking agents

Details Dispersions for coatings without external crosslinking agents Dispersions for coatings without external crosslinking agents

C - Chemistry, Metallurgy

08

F

400/6520

C08F 220/00 (2006.01) C08F 226/00 (2006.01) C09D 133/00 (2006.01) C09D 139/00 (2006.01)

Patent

CA 2017505

ABSTRACT Disclosed is an anionic emulsifier-free, aqueous dispersion which does not require an external crosslinking agent to provide coatings having good water and organic solvent resistance. The aqueous dispersion comprises an amine-containing polymer in combination with an acid-functional polymeric dispersant which has been neutralized by a fugitive amine. The "amine" of the amine-containing polymer is fixed as a result of being present in the polymer so as not to be volatile from a film from the final polymer dispersion product and yet be capable of interaction with acid functionality from the acid-functional polymeric dispersant. Also disclosed is a two stage method for preparing a preferred anionic emulsifier-free polymer dispersion product. The two stage method is characterized, in part, in that the mixture of polymerizable monomers for the first stage polymerization comprises an ethylenically unsaturated carboxylic acid or anhydride and at least one copolymerizable ethylenically unsaturated monomer different from the carboxylic acid or anhydride. The two stage method is also characterized, in part, in that the mixture of polymerizable monomers for the second stage polymerization comprises an ethylenically unsaturated monoamine and at least one ethylenically unsaturated monomer different from and copolymerizable with the ethylenically unsaturated monoamine.

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