Self-contained pressure-sensitive record material and process of preparation
AssigneeAppleton Papers Inc.
InventorMichael F. Stevens
Life of this patent
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Abstract
A self-contained pressure-sensitive record material comprising a substrate and a coating thereon of an interspersed mixture of pressure-rupturable capsules of an oily solvent solution of a substantially colorless basic chromogenic material and capsules of solid co-reactant acidic resin particles, said co-reactant acidic resin being capable of producing a color upon contact with the chromogenic material. The capsule mixture is applied to the substrate in a single coating step, resulting in a greater production efficiency. The resulting record material provides better imaging characteristics with less print bleed than self-contained systems known in the prior art.
Claims26
A self-contained pressure-sensitive record sheet material which comprises:
- (a) a substrate and
- (b) a coating on at least one surface of the substrate comprising a single layer of interspersed
- i. color-forming pressure-rupturable capsules of an oily solvent solution of at least one substantially colorless chromogenic compound and
- ii. capsules of solid acidic co-reactant resin particles substantially free of a liquid component, said co-reactant resin being capable of producing a color upon contact with said chromogenic compound,
- the capsule walls being materials selected from the group consisting of water soluble polymers formed by coacervation, urea-formaldehyde polymers formed by polymerization and melamine-formaldehyde polymers formed by polymerization;
- provided that when said capsules of chromogenic compound are produced by coacervation, said capsules of co-reactant resin are produced by melamine-formaldehyde polymerization.
A color-producing coating composition which comprises:
- (i) an aqueous dispersion of pressure-rupturable capsules of an oily solvent solution of at least one substantially colorless chromogenic compound and
- (ii) capsules of solid acidic co-reactant resin particles substantially free of a liquid component, said co-reactant resin being capable of producing a color upon contact with said chromogenic compound, the capsule walls being materials selected from the group consisting of water soluble polymers formed by coacervation, urea-formaldehyde polymers formed by polymerization and melamine-formaldehyde polymers formed by polymerization;
- provided that when said capsules of chromogenic compound are produced by coacervation, said capsules of co-reactant resin are produced by melamine-formaldehyde polymerization.
Minute capsules of solid particles of an oil-soluble metal salt of a phenol-formaldehyde novolak resin substantially free of a liquid component, the capsule walls being materials selected from the group consisting of water soluble polymers formed by coacervation, urea-formaldehyde polymers formed by polymerization and melamine-formaldehyde polymers formed by polymerization.
Dependencies are inferred from the claim text.