Composition containing dispersed pigment and preparation method thereof
AssigneeNippon Paint Co., Ltd.
InventorsHarunori Gouji, Hisao Kato, Hiroyoshi Kataoka
Life of this patent
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Abstract
A composition containing dispersed pigment comprises, as a dispersing agent, a reaction product of at least one polyamine having two or more primary amino groups and/or secondary amino groups and at least one polyisocyanate having two or more isocyanate groups.
Claims16
A resin composition containing a dispersed pigment, comprising:
- (a) from 0.1 to 30 parts by weight of a dispersing agent comprising the reaction product obtained by the reaction of reactants consisting essentially of at least one polyamine having two or more primary amino groups and/or secondary amino groups and at least one polyisocyanate having two or more isocyanate groups, wherein said amino groups are in excess with respect to said isocyanate groups so that said reaction product contains amino groups;
- (b) from 70 to 99.9 parts by weight of a pigment;
- (c) a vehicle resin, the weight ratio of said pigment to the vehicle resin solids being from 98:2 and 10:90;
- and
- (d) an organic solvent selected from the group consisting of hydrocarbons, esters, ketones and ethers.
A method of preparing a resin composition containing a dispersed pigment, comprising mixing and dispersing (a) a reaction product obtained by the reaction of reactants consisting essentially of at least one polyamine having two or more primary amino groups and/or secondary amino groups, and at least one polyisocyanate having two or more isocyanate groups, said amino groups being in excess with respect to said isocyanate group so that the reaction product between the polyamine and polyisocyanate contains amino groups, (b) a pigment, (c) a vehicle resin, and (d) an organic solvent, said polyamine and polyisocyanate being used in amounts so that the reaction product formed therebetween is present in an amount of 0.1 to 30 parts by weight based on 70 to 99.9 parts by weight of said pigment, the weight ratio of said pigment to the vehicle resin solids being from 98:2 to 10:90.
Dependencies are inferred from the claim text.