Emulsion for thermal recording material and thermal recording materials made by using the same
AssigneeMitsui Chemicals, Inc.
InventorsShinjirou Sakurai, Masaya Kusumoto, Masatoshi Kaneko, Futoshi Hoshino
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Abstract
The present invention provides an emulsion for thermal recording material to be used as the resin component of a protective layer constituting a thermal recording material, characterized by comprising a copolymer resin (A) prepared by copolymerizing (a) methacrylamide with (b) a vinyl monomer having a carboxyl group and resin particles (B) prepared by polymerizing (c) a vinyl monomer, with the resin (A) distributed substantially on the surfaces of the resin particles (B).
Claims18
A resin component for a protective layer of a thermal recording material,
- comprising resin particles (B) having a glass transition temperature greater than 0° C. and less than or equal to 60° C., and a copolymer resin (A) prepared by copolymerizing (a) methacrylamide and (b) a vinyl monomer having a carboxyl group;
- and
- said resin particles (B) being prepared by polymerizing (c) a vinyl monomer with said copolymer resin (A) so that the copolymer (A) is distributed substantially on the surfaces of the resin particles (B).
A resin component for a protective layer of a thermal recording material,
- comprising resin particles (B) having a glass transition temperature greater than 0° C. and less than or equal to 60° C., and prepared by polymerizing (c) a vinyl monomer in the presence of a copolymer resin (A) obtained by making water-soluble, with a base, a copolymer resin (A) prepared by copolymerizing a monomer mixture containing (a) methacrylamide and (b) a vinyl monomer having a carboxyl group.
A process for producing a resin component for a protective layer of a thermal recording material comprising:
- a step of copolymerizing a monomer mixture containing (a) methacrylamide and (b) a vinyl monomer having a carboxyl group, to obtain a copolymer resin, and
- a step of treating the copolymer resin with a base to convert it into a water-soluble copolymer resin (A) and then polymerizing (c) a vinyl monomer in the presence of the copolymer resin (A), to obtain resin particles (B), said particles (B) having a glass transition temperature greater than 0° C. and less than or equal to 60° C.
Dependencies are inferred from the claim text.