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Color deepening agent
| Details |
Inventors: Yagi, Kazuhisa; Suzuki, Sho; Nakashima, Norihiko;
Assignee: Kao Soap Co., Ltd. (Tokyo, JP)
Primary Examiner: Schofer; J. L.
Assistant Examiner: Lipman; Bernard
Attorney, Agent or Firm: Flynn, Thiel, Boutell & Tanis
A color deepening agent comprises (a) an aqueous resin composition obtained by polymerizing a monomer having a polymerizable unsaturated bond, in the presence of a polyurethane emulsion having a thermosetting reactivity, the refractive index of a dry film of said aqueous resin composition being lower than 1.50, and (b) at least one compound selected from the group consisting of silicon compounds and fluorine compounds. |
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DETAILED DESCRIPTION The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1.
A color deepening agent comprising (a) 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, and (b) at least one material selected from the group consisting of polysiloxanes, silane coupling agents, silica, silylating agents, fluorine resins and surface active agents containing a perfluoroalkyl group.
2.
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.
3.
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.
4.
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
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