Color deepening agent

Claim 2

A color deepening agent comprising an aqueous resin composition obtained by radical emulsion polymerization of a monomer having a polymerizable unsaturated bond, in the presence of an anionic or a cationic polyurethane emulsion in which the polyurethane contains thermosetting reactive groups capable of forming a cross-linked structure under heating, the refractive index of a dry, heat-treated film of said aqueous resin composition being lower than 1.50.

Claim 3

A color deepening agent as set forth in claim 1 wherein the polyurethane emulsion is a cationic or anionic polyurethane emulsion obtained by reacting a urethane prepolymer having a terminal isocyanate group with a compound having an amino group and, optionally, reacting the resulting reaction product with a hydrophilic agent.

Claim 4

A color deepening agent as set forth in claim 1, wherein the polyurethane emulsion is an anionic emulsion obtained by reacting a urethane prepolymer (A) having a terminal isocyanate group with an excess of a polyalkylene polyamine to form a polyurethane urea polyamine (B), then reacting the polyurethane urea polyamine with an epihalohydrin to form a first reaction product, then reacting the first reaction product with a cyclic polyvalent carboxylic acid anhydride to form a second reaction product and then mixing the second reaction product with an aqueous solution of a base to obtain an anionic self-emulsifiable polyurethane emulsion.

Claim 5

A color deepening agent as set forth in claim 1, wherein the polyurethane emulsion is a cationic emulsion obtained by reacting a urethane prepolymer (A) having a terminal isocyanate group with an excess of a polyalkylene polyamine to form a polyurethane urea polyamine (B), then reacting the polyurethane urea polyamine with an epihalohydrin to form a first reaction product, and then mixing the first reaction product with an aqueous solution of an acid to obtain a cationic self-emulsifiable polyurethane emulsion.

Claim 6

A color deepening agent as set forth in claim 1, wherein the polyurethane emulsion is cationic emulsion obtained by reacting a urethane prepolymer (A) having a terminal isocyanate group with an excess of a polyalkylene polyamine containing at least two primary or secondary amino groups and also containing at least one functional group having the formula --CH 2 --CH(OH)--CH 2 X, wherein X is Cl or Br, to form a polyurethane urea polyamine (B), and then mixing the polyurethane urea polyamine with an aqueous solution of an acid to obtain a cationic self-emulsifiable polyurethane emulsion.

Claim 7

A color deepening agent as set forth in claim 1, wherein the polyurethane emulsion is a cationic emulsion obtained by reacting a urethane prepolymer (A) having a terminal isocyanate group with an excess of a polyalkylene polyamine containing at least two primary or secondary amino groups and also containing at least one functional group having the formula --CH 2 --CH(OH)--CH 2 X, wherein X is Cl or Br, to form a polyurethane urea polyamine (B), then reacting a part of the free amino groups of the polyurethane urea polyamine with a blocked polyisocyanate having one free isocyanate group to form a first reaction product, and then mixing the first reaction product with an aqueous solution of an acid to obtain a cationic self-emulsifiable polyurethane emulsion.

Claim 8

A color deepening agent as set forth in claim 1, wherein the polyurethane emulsion is an anionic emulsion obtained by reacting a urethane prepolymer (A) having a terminal isocyanate group with an excess of a polyalkylene polyamine containing at least two primary or secondary amino groups and also containing at least one functional group having the formula --CH 2 --CH(OH)--CH 2 X, wherein X is Cl or Br, to form a polyurethane urea polyamine (B), then reacting the polyurethane urea polyamine with a cyclic polyvalent carboxylic acid anhydride to form a first reaction product and then mixing the first reaction product with an aqueous solution of a base to obtain an anionic self-emulsifiable polyurethane emulsion.

Claim 9

A color deepening agent as set forth in claim 1, wherein the polyurethane emulsion is an anionic emulsion obtained by reacting a urethane prepolymer (A) having a terminal isocyanate group with an excess of a polyalkylene polyamine containing at least two primary or secondary amino groups and also containing at least one functional group having the formula --CH 2 --CH(OH)--CH 2 X, wherein X is Cl or Br, to form a polyurethane urea polyamine (B), then reacting a part of the free amino groups of the polyurethane urea polyamine with a blocked polyisocyanate having one free isocyanate group to form a first reaction product, then reacting the first reaction product with a cyclic polyvalent carboxylic acid anhydride to form a second reaction product and then mixing the second reaction product with an aqueous solution of a base to obtain an anionic self-emulsifiable polyurethane emulsion.

Claim 10

A color deepening agent as set forth in claim 3 or claim 4, wherein the polyalkylene polyamine is diethylene triamine or triethylene tetramine.

Claim 11

A color deepening agent as set forth in claim 6 or claim 8, wherein the blocking agent for forming said blocked polyisocyanate is ε-caprolactam or methylethyl ketone oxime.

Claim 12

A color deepening agent as set forth in claim 3, claim 7 or claim 8, wherein the cyclic polyvalent carboxylic acid anhydride is maleic anhydride, succinic anhydride or phthalic anhydride.

Claim 13

A color deepening agent as set forth in claim 1 wherein said monomer having an unsaturated bond is selected from the group consisting of fluorinated acrylic acid esters, fluorinated methacrylic acid esters, vinyl ether monomers, α,β-unsaturated carboxylic acid esters and α,β-unsaturated compounds.

Claim 14

A color deepening agent as set forth in claim 1 in which the amount of said polymerizable monomer is from 99.5 to 2% by weight and the amount of polyurethane, calculated as the solids, is correspondingly from 0.5 to 98% by weight, to make 100% by weight of said monomer and said polyurethane.