초록 ▼

This invention relates to organic pigment-containing paper coating systems which require less severe calendering conditions to develop the surface and optical properties of paper than coating systems using inorganic pigments alone. It comprises overcoating a pre-applied mineral based coating with an

This invention relates to organic pigment-containing paper coating systems which require less severe calendering conditions to develop the surface and optical properties of paper than coating systems using inorganic pigments alone. It comprises overcoating a pre-applied mineral based coating with an organic pigment based coating.

대표청구항 ▼

A coated paper comprising a paper substrate having adhered to at least one surface thereof a first coating composition comprised of an inorganic pigment and a binder and having adhered to said first coating composition a second coating composition comprised of a binder and an organic pigment, said o

A coated paper comprising a paper substrate having adhered to at least one surface thereof a first coating composition comprised of an inorganic pigment and a binder and having adhered to said first coating composition a second coating composition comprised of a binder and an organic pigment, said organic pigment being water-insoluble graft copolymer particles consisting essentially of the free radical catalyzed graft copolymerization product of (1) at least one ethylenically unsaturated monomer and (2) a water-soluble prepolymer, the prepolymer moiety of the graft copolymer particles being present on the surface of the particles, said monomer (1) being selected from the group consisting of methyl alpha-chloroacrylate, ethyl alpha-chloroacrylate, methyl methacrylate, isopropyl methacrylate, phenyl methacrylate, vinyl chloride, acrylonitrile, methacrylonitrile, and monomers having the formula [Figure] wherein R is hydrogen or methyl, Y is methyl or chlorine, and n is 0, 1, 2, or 3 and said prepolymer (2) being selected from the group consisting of: a. anionic prepolymers prepared by the addition polymerization of a vinyl monomer or mixtures of vinyl monomers; b. nonionic prepolymers prepared by the addition polymerization of a vinyl monomer or mixtures of vinyl monomers and; c. cationic prepolymers prepared by the addition polymerization of (i) about 5 mole percent to about 95 mole percent of at least one cationic monomer selected from the group consisting of [Figure] (I) wherein R1 is hydrogen or methyl, R2 is hydrogen or a C1-C4 alkyl, R3 is hydrogen, a C1-C4 alkyl, [Figure] where Y is hydroxyl or halogen, [Figure] and (－CH2CH2O)nH where n is an integer 1 or more and X-is an anion, [Figure] (II) wherein R1 is hydrogen or a C1-C4 alkyl, R2 is hydrogen, alkyl or substituted alkyl, and R3 and X-are as defined in formula (I), [Figure] (III) wherein R1, R2, R3 and X-are as defined in formula (I), [Figure] (IV) wherein R1, R3 and X-are as defined in formula (I), [Figure] (V) wherein R1, R2, R3 and X-are as defined in formula (I), and n is an integer 1, 2 or 3 and [Figure] (VI) wherein R1, R2, R3 and X-are as defined in formula (I), and (ii) from about 95 mole percent to about 5 mole percent of at least one ethylenically unsaturated nonionic monomer selected from the group consisting of N-vinyl pyrrolidone, ethylenically unsaturated monomers having amide functionality, and ethylenically unsaturated monomers having hydroxyl functionality, the amount of prepolymer (2) employed in preparing the graft copolymer particles being from about 1 part to about 25 parts by weight for each 100 parts by weight of monomer (1) employed.