Guanidyl Paper Coating

Abstract

Herein is described a coating composition for the production of paper, for example, for use in inkjet printing. The coating composition includes a guanidyl dye fixative and optionally a binder and/or a filler. The paper product includes a paper substrate, and a coating layer carried by the paper substrate that includes a guanidyl dye fixative. The manufacture of the coated paper is provided by a process that includes applying the coating composition, which includes the guanidyl dye fixative, to paper.

What is claimed: 
     
         1 . A coating composition for paper, the composition comprising:
 a binder and/or a filler; and   a guanidyl dye fixative.   
     
     
         2 . The coating composition of  claim 1 , wherein the composition includes about 50% of the guanidyl dye fixative (dry basis, total solids), about 10 wt. % of a starch binder, and about 2 wt. % of a surfactant. 
     
     
         3 . A coated paper comprising:
 a paper substrate, and   a coating layer carried by the paper substrate that comprises a guanidyl dye fixative.   
     
     
         4 . The coated paper of  claim 3 , wherein the guanidyl dye fixative comprises a guanidyl copolymer that comprises a reaction product of a guanidyl reactant and a carbonyl reactant,
 the carbonyl reactant selected from the group consisting of an aldehyde, a ketone, a urea, an amide, and a mixture thereof; and   the guanidyl reactant selected from the group consisting of guanidine, 2-cyanoguanidine, guanidine salt, cyanamide, dicyanamide, biguanide, guanylurea, guanylthiourea, polycyclic guanidine, N-(4-aminobutyl)guanidine, 2-amino-5-guanidinopentanoic acid, imidodicarbonimidic diamide, (N-butylimidocarbonimidic diamide), (2-(methylguanidino) ethanoic acid), (2-[carbamimidoyl(methyl)amino]ethyl dihydrogen phosphate), cyanoguanidine, (2-guanidinoacetic acid), (3-(diaminomethylideneamino)propanoic acid), (N,N-dimethylimidodicarbonimidic diamide), (1-nitroguanidine), (4-amino-N-[amino(imino)methyl]benzenesulfonamide), (2-[10-(diaminomethylideneamino)decyl]guanidine dihydrochloride), melamine, alkyl guanidine, aryl guanidine, alkylaryl guanidine, alkyl biguanide, aryl biguanide, alkylaryl biguanide, and a mixture thereof.   
     
     
         5 . The coated paper of  claim 3 , wherein the guanidyl dye fixative comprises a guanidyl-carbonyl condensate. 
     
     
         6 . The coated paper of  claim 5 , wherein the guanidyl-carbonyl condensate is an alkaline-catalyzed guanidyl copolymer. 
     
     
         7 . The coated paper of  claim 5 , wherein the guanidyl-carbonyl condensate is an acid-catalyzed guanidyl copolymer. 
     
     
         8 . The coated paper of  claim 3 , wherein the coating layer comprises about 5 wt. % to about 100 wt. % of the guanidyl dye fixative (dry basis, total solids). 
     
     
         9 . The coated paper of  claim 3 , wherein the coating layer includes a binder and/or a filler. 
     
     
         10 . The coated paper of  claim 9 , wherein the filler is selected from the group consisting of calcium carbonate, kaolinite, a silicate, an aluminate, an aluminosilicate, a titanate, and a mixture thereof. 
     
     
         11 . The coated paper of any one of  claim 10 , wherein the coating layer comprises about 40 wt. % to about 70 wt. % of the filler. 
     
     
         12 . The coated paper of  claim 9 , wherein the binder is selected from the group consisting of a styrene butadiene copolymer, a styrene acrylate copolymer, an acrylic/vinyl acetate polymer, a starch, a polyvinyl alcohol, a polyvinylacetate, a latex, an acrylic polymer, an acrylic copolymer, a styrene-acrylate copolymer, a polyethylene-polyvinyl acetate, a polyethylene-polyvinylalcohol, sodium alginate, and a mixture thereof. 
     
     
         13 . The coated paper of  claim 9 , wherein the coating layer comprises about 1 wt. % to about 50 wt. % of the binder. 
     
     
         14 . A process of forming a coated paper comprising:
 applying a coating composition, that includes a guanidyl dye fixative, to paper; and then   drying the coating composition on the paper to provide a coating layer carried by the paper.   
     
     
         15 . The process of  claim 14 , wherein the coating composition is applied by a method selected from spray coating, gravure coating, reverse gravure coating, rod coating, size press coating, blade coating, or curtain coating. 
     
     
         16 . The process of  claim 15 , further comprising removing excess coating composition from the paper by blade or rod. 
     
     
         17 . The process of  claim 14 , wherein the guanidyl dye fixative comprises a guanidyl copolymer that comprises a reaction product of a guanidyl reactant and a carbonyl reactant,
 the carbonyl reactant selected from the group consisting of an aldehyde, a ketone, a urea, an amide, and a mixture thereof; and   the guanidyl reactant selected from the group consisting of guanidine, 2-cyanoguanidine, guanidine salt, cyanamide, dicyanamide, biguanide, guanylurea, guanylthiourea, polycyclic guanidine, N-(4-aminobutyl)guanidine, 2-amino-5-guanidinopentanoic acid, imidodicarbonimidic diamide, (N-butylimidocarbonimidic diamide), (2-(methylguanidino) ethanoic acid), (2-[carbamimidoyl(methyl)amino]ethyl dihydrogen phosphate), cyanoguanidine, (2-guanidinoacetic acid), (3-(diaminomethylideneamino)propanoic acid), (N,N-dimethylimidodicarbonimidic diamide), (1-nitroguanidine), (4-amino-N-[amino(imino)methyl]benzenesulfonamide), (2-[10-(diaminomethylideneamino)decyl]guanidine dihydrochloride), melamine, alkyl guanidine, aryl guanidine, alkylaryl guanidine, alkyl biguanide, aryl biguanide, alkylaryl biguanide, and a mixture thereof.   
     
     
         18 . The process of  claim 14 , wherein the coating composition includes a filler; wherein the filler is selected from the group consisting of calcium carbonate, kaolinite, a silicate, an aluminate, an aluminosilicate, a titanate, and a mixture thereof; and wherein the coating composition comprises about 30 wt. % to about 70 wt. % of the filler. 
     
     
         19 . The process of  claim 14 , wherein the coating composition includes a binder; wherein the binder is selected from the group consisting of a styrene butadiene copolymer, a styrene acrylate copolymer, an acrylic/vinyl acetate polymer, a starch, a polyvinyl alcohol, a polyvinylacetate, a latex, an acrylic polymer, an acrylic copolymer, a styrene-acrylate copolymer, a polyethylene-polyvinyl acetate, a polyethylene-polyvinylalcohol, sodium alginate, and a mixture thereof; and wherein the coating composition comprises about 1 wt. % to about 50 wt. % of the binder.