Offset printing paper
AssigneeNippon Paper Industries Co., Ltd.
InventorsToshiyuki Takano, Hiroshi Ono, Hideki Fujiwara
Life of this patent
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Abstract
A surface-treating agent mainly includes three constituents: a water-soluble polymer; a surface sizing agent which is a copolymer of a styrene type monomer and an anionic monomer and which mainly includes a water-soluble copolymer containing 20 to 80 weight % of the styrene type monomer; and a surface sizing agent which is a copolymer of an olefin type monomer and an anionic monomer and which mainly includes a water-soluble copolymer containing 20 to 80 weight % of the olefin type monomer. The surface-treating agent is coated and dried on a base paper for offset printing.
Claims19
An offset printing paper which is made by coating a surface-treating agent mainly comprising three constituents:
- Constituent A, Constituent B, and Constituent C on a base paper for printing and drying the coating,
- wherein Constituent A comprises water-soluble polymers;
- Constituent B comprises a surface sizing agent which is a copolymer of a styrene type monomer and an anionic monomer, said copolymer mainly comprising a water-soluble copolymer containing 20 to 80 weight % of the styrene type monomer;
- Constituent C comprises a surface sizing agent which is a copolymer of an olefin type monomer and an anionic monomer, said copolymer mainly comprising a water soluble copolymer containing 20 to 80 weight % of the olefin type monomer.
An offset printing paper comprising a base paper and a coating formed on the base paper by applying a surface-treating agent comprising mainly:
- Constituent A consisting of water-soluble polymers;
- Constituent B consisting of a surface sizing agent which is a water-soluble copolymer of a styrene type monomer and an anionic monomer, said copolymer containing 20 to 80% by weight of the styrene type monomer;
- and
- Constituent C consisting of a surface sizing agent which is a water-soluble copolymer of an olefin type monomer and an anionic monomer, said copolymer containing 20 to 80% by weight of the olefin type monomer.
A method of producing an offset printing paper, comprising the steps of:
- preparing a surface-treating agent comprising mainly:
- Constituent A consisting of water-soluble polymers;
- Constituent B consisting of a surface sizing agent which is a water-soluble copolymer of a styrene type monomer and an anionic monomer, said copolymer containing 20 to 80% by weight of the styrene type monomer;
- and
- Constituent C consisting of a surface sizing agent which is a water-soluble copolymer of an olefin type monomer and an anionic monomer, said copolymer containing 20 to 80% by weight of the olefin type monomer;
- applying the surface-treating agent on a base paper to form a coating thereon;
- and
- drying the coating.
Dependencies are inferred from the claim text.