Coated synthetic paper adapted for offset printing and method for production thereof

Claim 1

A coated synthetic paper adapted for offset printing comprising a base paper sheet comprising fibrous material at least 5% by weight of which is formed of polyolefinic pulp fibrils which are formed from a polyolefinic polymer and a hydrophilic polymer, said polyolefinic pulp fibrils having a specific surface area of at least 0.7 m 2 /g., and a microporous and discontinuous coating layer formed on at least one of the surfaces of said base paper sheet, said coating layer being substantially formed of 5 to 100 parts by weight on a dry weight basis of an adhesive component and 100 parts by weight on a dry weight basis of a pigment component, at least 5% by weight on a dry weight basis of said pigment component being an organic polymer pigment in the form of finely divided particles selected from the group consisting of polystyrene, polymethyl methacrylate and vinyl copolymers thereof.

Claim 13

A method for the production of a coated synthetic paper adapted for offset printing, comprising: preparing a base paper sheet comprising fibrous material, at least 5% by weight of which is formed of polyolefinic pulp fibrils which are formed from a polyolefinic polymer and a hydrophilic polymer, said polyolefinic pulp fibrils having a specific surface area of at least 0.7 square meter/g., and forming a microporous and discontinuous coating layer on at least one of the surfaces of said base paper sheet with a coating composition consisting essentially of 5 to 100 parts by weight on a dry weight basis of an adhesive component and 100 parts by weight on a dry weight basis of a pigment component, at least 5% by weight on a dry weight basis of said pigment component being an organic polymer pigment in the form of finely divided particles selected from the group consisting of polystyrene, polymethyl methacrylate and vinyl copolymers thereof.

Claim 14

A method for the production of a coated synthetic paper adapted for offset printing, comprising: preparing a base paper sheet comprising fibrous material, at least 5% by weight of which is formed of polyolefinic pulp fibrils which are formed from a polyolefinic polymer and a hydrophilic polymer, said polyolefinic pulp fibrils having a specific surface area of at least 0.7 square meter/g., and forming a microporous and discontinuous coating layer on at least one of the surfaces of said base paper sheet with a coating composition consisting essentially of 5 to 100 parts by weight on a dry weight basis of an adhesive component and 100 parts by weight on a dry weight basis of a pigment component, at least 5% by weight on a dry weight basis of said pigment component being an organic polymer pigment in the form of finely divided particles selected from the group consisting of polystyrene, polymethyl methacrylate and vinyl copolymers thereof.

Claim 17

A method for preparing a coated synthetic paper adapted for offset printing comprising preparing a base paper sheet comprising fibrous material, at least 5% up to 95% by weight of which is formed of polymeric pulp fibrils, the balance being cellulose pulp, said polymeric pulp fibrils being formed of a hydrophilic component and a polyolefinic polymer in a weight ratio range of 1:99 to 30:70, said polymeric pulp fibrils having a specific surface area of at least 0.7 square meter/g., and applying to at least one surface of said base paper sheet from 015 to 30 grams per square meter of a microporous and discontinuous coating layer, the coating layer consisting essentially of: 5 to 100 parts by weight on a dry weight basis of an adhesive component and 100 parts by weight on a dry weight basis of a pigment component, from 5 to 100% by weight on a dry weight basis of said pigment component being an organic polymer pigment in the form of finely divided particles and selected from the group consisting of polystyrene, polymethyl methacrylate and vinyl copolymers thereof and from 0 to 95% by weight inorganic pigment.

Claim 18

A method for preparing a coated synthetic paper adapted for offset printing comprising preparing a base paper sheet comprising fibrous material, at least 5% up to 95% by weight of which is formed of polymeric pulp fibrils, the balance being cellulose pulp, said polymeric pulp fibrils being formed of a hydrophilic component and a polyolefinic polymer in a weight ratio range of 1:99 to 30:70, said polymeric pulp fibrils having a specific surface area of at least 0.7 square meter/g., and applying to at least one surface of said base paper sheet from 015 to 30 grams per square meter of a microporous and discontinuous coating layer, the coating layer consisting essentially of: 5 to 100 parts by weight on a dry weight basis of an adhesive component and 100 parts by weight on a dry weight basis of a pigment component, from 5 to 100% by weight on a dry weight basis of said pigment component being an organic polymer pigment in the form of finely divided particles and selected from the group consisting of polystyrene, polymethyl methacrylate and vinyl copolymers thereof and from 0 to 95% by weight inorganic pigment.

Claim 21

A method for the production of a coated synthetic paper adapted for offset printing, comprising: preparing a base paper sheet comprising fibrous material, at least 5% by weight of which is formed of polyolefinic pulp fibrils, which are formed from a polyolefinic polymer and a hydrophilic polymer, said polyolefinic pulp fibrils having a specific surface area of at least 0.7 square meter/g., and forming a microporous and discontinuous coating layer on at least one of the surfaces of said base paper sheet with a coating composition consisting essentially of 5 to 100 parts by weight on a dry weight basis of an adhesive component and 100 parts by weight on a dry weight basis of pigment component, at least 5% by weight on a dry weight basis of said pigment component being an organic polymer pigment in the form of finely divided particles selected from the group consisting of polystyrene, poly(α-methylstyrene), poly(4-ethylstyrene), poly(1-vinylnaphthalene), polyvinyl chloride, poly (hexafluoropropylene), polyethylene, polypropylene, poly(1-butene), poly(4-methyl-1-pentene), polyvinylidene chloride, poly (1,2-difluoroethylene), poly(methyl methacrylate), poly(isopropyl chloroacrylate), poly(2-chloroethyl methacrylate), poly (cyclohexyl chloroacrylate), poly(methyl chloroacrylate), polyvinyl acetate, polyallyl acetate, polyvinyl propionate, poly(ethylene 1,5-naphthalate), polyethylene terephthalate, poly (hexamethylene adipamide), poly(ε-capramide), poly(decamethylene adipamide), polycarbonates, polyacetals, polyvinyl formal, polyvinyl butyral, and copolymers of the constituent monomers of the above-named polymers.

Claim 22

A method for the production of a coated synthetic paper adapted for offset printing, comprising: preparing a base paper sheet comprising fibrous material, at least 5% by weight of which is formed of polyolefinic pulp fibrils, which are formed from a polyolefinic polymer and a hydrophilic polymer, said polyolefinic pulp fibrils having a specific surface area of at least 0.7 square meter/g., and forming a microporous and discontinuous coating layer on at least one of the surfaces of said base paper sheet with a coating composition consisting essentially of 5 to 100 parts by weight on a dry weight basis of an adhesive component and 100 parts by weight on a dry weight basis of pigment component, at least 5% by weight on a dry weight basis of said pigment component being an organic polymer pigment in the form of finely divided particles selected from the group consisting of polystyrene, poly(α-methylstyrene), poly(4-ethylstyrene), poly(1-vinylnaphthalene), polyvinyl chloride, poly (hexafluoropropylene), polyethylene, polypropylene, poly(1-butene), poly(4-methyl-1-pentene), polyvinylidene chloride, poly (1,2-difluoroethylene), poly(methyl methacrylate), poly(isopropyl chloroacrylate), poly(2-chloroethyl methacrylate), poly (cyclohexyl chloroacrylate), poly(methyl chloroacrylate), polyvinyl acetate, polyallyl acetate, polyvinyl propionate, poly(ethylene 1,5-naphthalate), polyethylene terephthalate, poly (hexamethylene adipamide), poly(ε-capramide), poly(decamethylene adipamide), polycarbonates, polyacetals, polyvinyl formal, polyvinyl butyral, and copolymers of the constituent monomers of the above-named polymers.