Stock material or miscellaneous articles – Composite – Of aldehyde or ketone condensation product
Patent
1992-06-29
1993-04-20
Sluby, P. C.
Stock material or miscellaneous articles
Composite
Of aldehyde or ketone condensation product
428420, 4285377, 428913, 428332, B32B 2708
Patent
active
052041905
ABSTRACT:
Herein disclosed are a method for preparing an aqueous developer dispersion which comprises the steps of dissolving, in an organic solvent, a developer which comprises a nuclear-substituted salicylic acid salt represented by the following general formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 may be the same or different and each represents a hydrogen atom, a halogen atom, an alkyl group having not more than 15 carbon atoms, a cycloalkyl group, a phenyl group, a nuclear-substituted phenyl group, an aralkyl group or a nculear-substituted aralkyl group, or two adjacent groups selected from R.sub.1 to R.sub.4 may be bonded together to form a ring; n is an integer of not less than 1; and M represents magnesium, calcium, zinc, aluminum, iron, cobalt, nickel or a basic ion thereof; emulsifying and dispersing the resulting solution in an aqueous solution of an acrylamide copolymer having a degree of polymerization of not less than 100 obtained by copolymerizing 96 to 70 mole % of acrylamide with 4 to 30 mole % of an alkyl or alkoxyalkyl, having not more than 4 carbon atoms, ester of acrylic acid, methacrylic acid, itaconic acid or maleic acid; then heating the emulsified dispersion to remove the organic solvent by distillation; and optionally finely wet-pulverizing the resulting aqueous dispersion to an extent that reduction in the average particle size of the developer dispersed in the dispersion does not exceed 10%; as well as pressure-sensitive recording paper obtained using the aqueous developer dispersion. The recording paper is substantially improved in the developing density, developing velocity and printability.
REFERENCES:
patent: 4226962 (1980-10-01), Stolfo
patent: 4401721 (1983-08-01), Hida
Oda Shigeru
Saito Toranosuke
Shiozaki Tomoharu
Tanaka Masato
Kanzaki Paper Manufacturing Co. Ltd.
Sanko Kaihatsu Kagaku Kenyusho
Sluby P. C.
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