Fuji Photo Film Company, Limited

Hodogaya Chemical Co., Ltd.

Akio Watanabe

Keiso Saeki

Yoshihide Miyazawa

Minoru Ozutsumi

Hiroharu Matsukawa

Toshiaki Aoai

Fumiaki Shinozaki

Shintaro Washizu

Sadao Ishige

Shun-ichi Ishikawa

Masahiko Yamaguchi

Masataka Kiritani

Katsuichi Motohashi

Susumu Suzuka

Satoshi Ogawa

Masatake Kiritani

Hitoshi Imamiya

A photodegradable microcapsule is described which has a wall made of a polymer coat having an acid-decomposable bond selected from a silylether bond and a silylureido bond and which contains a compound that generates an acid upon light irradiation.

Photodegradable microcapsules

A pressure sensitive recording sheet having thereon a layer of fine oil microcapsules produced by the process which comprises dispersing or emulsifying finely in a polar solvent an oily liquid containing a substantially colorless color former capable of reacting with a developer to form a colored product and a polyisocyanate adduct having a free isocyanate group and adding to the dispersion or emulsion of the oil droplets a polyamine or a polyamine adduct having a free amino group as a polymerization promotor, whereby the polymerization of the polyisocyanate adduct is caused from the outer side of each oil droplet to encapsulate the oil droplet by the insolubilized polyisocyanate adduct. By this process the size of the microcapsules can be controlled quite easily.

Pressure sensitive recording sheet

A pressure-sensitive copying paper comprising an adsorbent solid acid and a microencapsulated color former capable of forming a distinct color when reacted with the adsorbent acid coated on the same or a different surface of a support or supports, the microencapsulated color former being at least one fluoran compound represented by the formula; ##STR1## WHEREIN R.sub.1, R.sub.2, Z, m and ##STR2## are as defined hereinafter, is disclosed.

Fluoran compounds

A process for the production of microcapsules comprising bonding chemically or physically a heterocyclic diamine, which is soluble or dispersible in water, to an organic compound in a polar solvent to thereby form a substance, which is insoluble in the polar solvent, and then depositing the substance directly on the surface of particles or droplets of a hydrophobic core material.

Production of microcapsules

A pressure-sensitive copying material comprising a support having thereon a microencapsulated color former capable of forming a distinct color when reacted with an electron-accepting solid, the microencapsulated color former comprising at least one benzoxazine derivative represented by the formula (Ia) ##SPC1## , a benzodioxane derivative represented by the formula (Ib) ##SPC2## And a mixture thereof, wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and X are as defined hereinafter.

Pressure-sensitive copying material

A pressure-sensitive copying paper comprising an adsorbent solid acid and a microencapsulated color former capable of forming a distinct color when reacted with the adsorbent acid coated on the same or a different surface of a support or supports, the microencapsulated color former being at least one lactone compound of a pyridine-carboxylic acid represented by the formula ##SPC1## Or a mixture thereof, wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and A are as defined hereinafter, is disclosed.

Pressure-sensitive copying paper containing lactone compounds of

A pressure-sensitive copying paper comprising an adsorbent solid acid and a microencapsulated color former capable of forming a distinct color when reacted with the adsorbent acid coated on the same or a different surface of a support or supports, the microencapsulated color former being at least one lactone compound derived from a pyridine-carboxylic acid represented by the formula ##SPC1## Or a mixture thereof, wherein R.sub.1, R.sub.2, R.sub.3 and the partial structure ##SPC2## Are as defined hereinafter, is disclosed.

Growing community of inventors

Fujimiya, undefined

Akio Watanabe