Aqueous resin dispersion
AssigneeToyo Ink Manufacturing Co., Ltd.
InventorsYasushi Kodama, Kiyoshi Okugami, Hitoshi Muroi, Atsuhiro Yamamoto
Life of this patent
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Abstract
An aqueous resin dispersion prepared by dispersing in an aqueous medium in the presence of ammonia or an amine a composite resin composition comprising carboxylic groups in an excessive amount and a reaction product obtained by at least partially reacting a specific acrylic resin (A), a specific aromatic epoxy resin (B) and a specific phenolic resin (C), characterized in that the acrylic resin (A) and the aromatic epoxy resin (B) are at least partially reacted with each other, and the phenolic resin (C) is pre-condensed with the acrylic resin (A) or aromatic epoxy resin (B).
Claims15
An aqueous resin dispersion prepared by dispersing a composite resin composition in an aqueous medium in the presence of ammonia or an amine in such an amount that the resulting final composition has a pH of 4 to 11, the composite resin composition comprising carboxylic groups in an excessive amount and a reaction product obtained by at least partially reacting an acrylic resin (A) having 12-70 wt.% of monobasic carboxylic acid monomer units as an essential component, an aromatic epoxy resin (B) having 1.1 to 2.0 epoxy groups on the average in the molecule and a phenolic resin (C) whose main constituent is substantially represented by the following formula ##STR3## wherein R.sub.1 is a hydrogen atom or an alkyl group having from 1 to 12 carbon atoms, R.sub.2 and R.sub.3 are each a hydrogen atom or a methylol group, and n is an integer of from 1 to 3,
- characterized in that the acrylic resin (A) and the aromatic epoxy resin (B) are at least partially reacted with each other, and the phenolic resin (C) is pre-condensed with at least one member selected from the acrylic resin (A) and the aromatic epoxy resin (B).
An aqueous resin dispersion comprising a composite resin composition which is in excess of carboxylic groups and which is a mixture of a partial reaction product (D) of an acrylic resin (A) having, as an essential component, 12 to 70 wt.% of monobasic carboxylic acid monomer units and an aromatic epoxy resin (B) having, on average, 1.1 to 2.0 epoxy groups in one molecule thereof, with a phenolic resin (C) comprising a principal component of the following formula ##STR4## in which R.sub.1 represents a hydrogen atom or an alkyl group having from 1 to 12 carbon atoms, R.sub.2 and R.sub.3 each represent a hydrogen atom or a methylol group, and n is an integer of from 1 to 3, said composite resin composition being dispersed in an aqueous medium in the presence of ammonia or an amine in an amount sufficient to allow the resulting final composition to have a pH of 4-11.
Dependencies are inferred from the claim text.