Pressure-sensitive copying paper
AssigneeThe Wiggins Teape Group Limited
InventorsDaniel G. Moyaerts, Christian Y. A. M. De Raedt, Michael E. Hobson
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Abstract
A styrene-acrylic ester copolymer latex is used for prevention of premature coloration in CFB pressure-sensitive copying paper which is neutral- or alkaline-sized with an alkyl ketene dimer and which utilizes an acid clay or other inorganic color developer composition. The copolymer may be carried by the base paper, e.g. as a result of size press or size bath application, or may be present in the microcapsule coating.
Claims16
Pressure-sensitive copying paper comprising base paper neutral- or alkaline-sized with an alkyl ketene dimer size and treated with a styrene-acrylic ester copolymer latex, wherein said base paper is coated on one surface with pressure-rupturable microcapsules containing an oil solution of chromogenic material and coated on the other surface with an inorganic colour developer composition.
Pressure-sensitive copying paper comprising base paper neutral- or alkaline-sized with an alkyl ketene dimer size and treated with a styrene-acrylic ester copolymer latex, wherein said base paper is coated on one surface with pressure-rupturable microcapsules containing an oil solution of chromogenic material and coated on the other surface with a coating of an inorganic colour developer composition, wherein said styrene-acrylic ester copolymer latex consists essentially of styrene and acrylic ester as the comonomer components of the copolymer latex.
Pressure-sensitive copying paper comprising base paper neutral- or alkaline-sized with an alkyl ketene dimer size and coated on one surface with pressure-rupturable microcapsules containing an oil solution of chromogenic material and on the other surface with an inorganic colour developer composition, wherein a styrene-acrylic ester copolymer latex is present in the microcapsule coating.
Pressure-sensitive copying paper comprising base paper neutral- or alkaline-sized with an alkyl ketene dimer size and coated on one surface with pressure-rupturable microcapsules containing an oil solution of chromogenic material and coated on the other surface with a coating of an inorganic colour developer composition wherein a styrene-acrylic ester copolymer latex is present in the microcapsule coating, and wherein said styrene-acrylic ester copolymer latex consists essentially of styrene and acrylic ester the comonomer components of the copolymer latex.
Dependencies are inferred from the claim text.