Microcapsule containing ultraviolet absorber

Details Microcapsule containing ultraviolet absorber Microcapsule containing ultraviolet absorber

1993-09-23

1995-08-22

Lovering, Richard D.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

252589, 42840222, B01J 1316, F21V 906, G02B 522

Patent

active

054439094

ABSTRACT:
The present invention provides a heat sensitive recording material comprising a substrate, a recording layer formed over the substrate and containing a colorless or light-colored basic dye and a color acceptor, and a protective layer formed over the recording layer, the recording material being characterized in that microcapsules having an ultraviolet absorber enclosed therein and having substantially no color forming ability are incorporated in the protective layer.
Further, the present invention provides microcapsules having an ultraviolet absorber and as required an organic solvent enclosed therein, which have capsule wall film of synthetic resin and mean particle size of 0.1 to 3 .mu.m.

REFERENCES:
patent: 3852401 (1974-12-01), Suzuki et al.
patent: 4056610 (1977-11-01), Barber, Jr. et al.
patent: 4511909 (1985-04-01), Arai
patent: 4576891 (1986-03-01), Adair et al.
patent: 4588639 (1986-05-01), Ozono
patent: 4626877 (1986-12-01), Arai et al.
patent: 4663642 (1987-05-01), Kameda et al.
patent: 4828955 (1989-05-01), Kasai et al.
patent: 5047314 (1991-09-01), Sakai et al.

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