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AssigneeRohm Co., Ltd.
InventorsHorst Dinklage, Herbert Fink, Peter Frank, Hubert Rauch, Werner Siol
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What are disclosed are methods for making an aqueous dispersion of a synthetic resin copolymer, said dispersion having high pigment binding capacity and adaptable to use in the preparation of printing inks or pastes, said copolymer comprising a predominant amount of water insoluble monomers together with from 3 to 8 percent by weight of an acid component which is a water soluble acid or salt, which method comprises gradually adding said water insoluble monomers, together with a portion of said acid component, to an aqueous medium containing the balance of the acid component in the form of a dissolved water soluble salt; aqueous synthetic resin dispersions made by these methods; and printing inks comprising such an aqueous synthetic resin dispersion which has been neutralized and combined with such an amount of an organic solvent as converts the dispersion into a solution or colloidal dispersion of the synthetic resin.
A method for making an aqueous dispersion of a synthetic resin copolymer by the free radical copolymerization of from 92 to 97 percent, by weight of the copolymer, of water insoluble ethylenically unsaturated monomers and from 3 to 8 percent, by weight of the copolymer, of an acid component selected from the group consisting essentially of .alpha.,.beta.-ethylenically unsaturated mono- and di-carboxylic acids and the water soluble salts thereof, the weight of salt in each instance being calculated as the weight of the corresponding free acid, said dispersion having high pigment binding capacity, which method comprises gradually adding said water insoluble monomers, under free radical copolymerization conditions, together with a portion of said acid component which is at least 2 percent by weight of the copolymer, to an aqueous medium comprising from 1 to 4 percent, by weight of the copolymer, of at least one water soluble salt of a mono- or di-carboxylic acid forming the remainder of said acid component.
Dependencies are inferred from the claim text.