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US 4,211,437 AGranted
Stilt capsules for pressure-sensitive record material
AssigneeAppleton Papers Inc.
InventorsHugh K Myers, Donald E. Hayford
Life of this patent
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AssigneeAppleton Papers Inc.
InventorsHugh K Myers, Donald E. Hayford
Estimating the term…
This invention relates to paper, or like sheet material, having a coating comprising minute, liquid-containing, pressure-rupturable capsules, and also larger, non-rupturable kaolin-containing stilt capsules arranged in interspersion and in close juxtaposition. In the preferred embodiment the smaller capsules contain a liquid marking agent. The capsules, large and small, are interspersed as to size, and are closely spaced on the sheet, so that an intentional impact directed on a small area of the coating will crush substantially all of the small capsules in the area and result in the release of liquid marking agent, whereas a casually applied pressure will rupture relatively few of the small capsules in the area. The marking liquid may be a colorless chromogenic color reactant. The small capsules on a sheet containing said marking liquid may be associated with other color forming materials on said sheet, or alternatively said color forming materials may be contained on another contacting sheet.
A pressure-sensitive record material which comprises a substrate, and a coating on at least one surface of the substrate comprising minute pressure-rupturable capsules containing a liquid solution of colorless chromogenic material and non-pressure-rupturable capsules containing a plurality of agglomerated kaolin particles, the kaolin-containing capsules being produced by coacervation of a water-soluble polymer and being present in an amount of at least 1/5 of the weight of the liquid-containing capsules, said kaolin-containing capsules having an average diameter of about 2 to 12 times greater than the liquid-containing capsules and being substantially uniformly sized and randomly interspersed in the coating with the liquid-containing capsules.
A pressure-sensitive record material comprising a substrate having a coating thereon of an interspersed mixture of minute capsules in close juxtaposition comprising substantially spherical, pressure-rupturable capsules containing liquid droplets of colorless chromogenic marking material and non-pressure-rupturable capsules consisting essentially of a plurality of agglomerated kaolin particles held in a matrix of deposited coacervated water-soluble polymer and having an average diameter of 2 to 12 times greater than the pressure-rupturable capsules, the amount of kaolin-containing capsules present in the record material being at least 1/5 the weight of the pressure-rupturable capsules.
A pressure-sensitive record material which comprises a first substrate coated with an interspersed mixture of minute capsules in close juxtaposition comprising substantially spherical, pressure-rupturable capsules containing liquid droplets of colorless chromogenic marking material, and non-pressure-rupturable capsules consisting essentially of a plurality of agglomerated kaolin particles held in a matrix of deposited coacervated material and having an average diameter of about 2 to 12 times greater than the liquid-containing capsules, the amount of kaolin-containing capsules present in the record material being at least 1/5 the weight of the pressure-rupturable capsules, and, in contiguous relationship with said first substrate, a second substrate having a coating of a material capable of producing a colored mark upon contact with said liquid droplets of marking material upon rupture of said pressure-rupturable capsules.
Dependencies are inferred from the claim text.