Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1978-12-01
1980-09-16
Herbert, Jr., Thomas J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
252316, 427152, 427151, 427261, 428206, 428207, 428307, 428323, 428327, 428341, 428914, B41M 512, B41M 516
Patent
active
042230608
ABSTRACT:
Self-contained pressure-sensitive copying material having a coating which contains both a particulate mineral color-developing material and microcapsules enclosing a solution of a colorless color former which is reactive with the color developing material to produce a colored product, in which the particles of color developing material (e.g. an acidic clay) and optionally the microcapsules as well, are chemically treated with a protective agent to inhibit premature color development wherein the protective agent may be a self-crosslinkable polymer, such as an aminoplast polymer (e.g. a urea-formaldehyde or melamine-formaldehyde polymer), or an epichlorohydrin polymer (e.g. an aminoepichlorohydrin or an amide/aminoepichlorohydrin polymer), or an anionic surfactant (e.g. a lauryl sulphate salt or a sulphonated ricinoleic acid derivative, a dodecyl benzene sulphonate salt, or a dibutyl or dioctyl ester of sulphosuccinic acid), or a fluorine-containing paper sizing agent, or a non-self-crosslinkable polymer which is a wet-strength agent for paper (e.g. a polyethylene imine resin).
REFERENCES:
patent: 2348128 (1944-05-01), Groak
patent: 3036924 (1962-05-01), Newman
patent: 3617334 (1971-11-01), Brockett et al.
patent: 3619239 (1971-11-01), Osada et al.
patent: 3663256 (1972-05-01), Miller et al.
Raine Paul R.
Westcott Lawrence
Herbert, Jr. Thomas J.
Wiggins Teape Limited
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