Dainippon Ink and Chemicals, Incorporated

Riso Kagaku Corporation

Mitsuo Kase

Noboru Okoshi

Kazue Tsuyuzaki

Ichiro Muramatsu

Hidetoshi Konno

Yoichi Kawasaki

Hiroshi Matsuda

Isao Tabayashi

Shunji Arimoto

Toshiaki Kano

Yoichi Tanimoto

Finely dispersed polyurethane polyurea crosslinked particles having an average particle diameter of not greater than 1 .mu.m and essentially comprising (A) an ion-forming polyol, (B) a polyisocyanate, and (C) a polyamine; and a process for producing the same are disclosed. The present invention provides finely dispersed polyurethane polyurea crosslinked particles and a process for producing the same; the dispersed particles being firmly crosslinked and having an average particle diameter of not greater than 1 .mu.m, and the particle dispersion having high preservation stability, preventing the core substance, if encapsulated therein, from undergoing denaturation, and exhibiting per se film-forming properties to provide a film excellent in water resistance, solvent resistance and chemical resistance.

Finely dispersed polyurethane polyurea crosslinked particles and process

The present invention provides polymer fine particles for a jet ink, each polymer fine particle containing a colorant, wherein the polymer fine particles have an average particle diameter in the range of 5 to 700 nm, a maximum particle diameter of at most 1000 nm, and a particle size distribution, at m value of shape parameter according to the Weibull distribution, of at least 1.3, and wherein the polymer fine particles are able to form a coating film at room temperature. By using the aforementioned polymer fine particles as essential components according to the present invention, it is possible to provide polymer fine particles for a jet ink which display a superior storage stability, resistance to wear, durability, water resistance, solvent resistance, chemical resistance and the like, in which there is no clogging of the ink jet; and a jet ink comprising the aforementioned polymer fine particles which produces clear prints over a long period of time wherein smudging of the printed matter due to water or sweat does not easily occur.

Polymer fine particles for jet ink, process for producing the same, and

A finely particulate polymer for use in a stencil ink is disclosed which is uniformly dispersible into a binder polymer having a solubility parameter of 11.0 or lower and has an average particle diameter of from 0.1 to 10 .mu.m and a maximum particle diameter of 50 .mu.m or smaller. The finely particulate polymer is highly advantageous in that stencil inks having an appropriate viscosity can be easily obtained with the particulate polymer using the same formulation even when the inks contain different colorants, and that with the particulate polymer, a colorant which has been unusable due to its adverse influence on the storage stability of stencil inks can be used to produce a stencil ink having excellent storage stability by encapsulating the colorant in the individual polymer particles.

Finely particulate polymer for stencil ink

A crosslinked polyurethane polyurea spherically particulate polymer having an average particle diameter of 0.1 to 500 .mu.m, wherein the polymer molecule contains an isocyanurate ring in an amount of 10 to 30% by weight is disclosed. A process for producing the crosslinked polyurethane polyurea spherically particulate polymer is also disclosed. The process comprises the steps of: reacting an isocyanurate ring-containing polyisocyanate compound with a polyhydroxy compound to form an organic phase capable of forming a three-dimensional crosslinked structure due to the reaction, wherein the amount of isocyanate groups in the polyisocyanate compound is stoichiometrically larger than that of hydroxyl groups in the polyhydroxy compound; finely dispersing the organic phase into water; and adding a polyamine to the dispersion to make interfacial polymerization between the organic phase and the polyamine and a polyurethane-forming reaction within particles, wherein the amount of the polyamine is stoichiometrically equivalent to or smaller than the stoichiometrical excess of isocyanate groups. The particulate polymer is excellent in solvent resistance and has a completely spherical shape without wrinkle on the particle surface. The particulate polymer has a good toughness and mechanical properties. Further, the particulate polymer has no reactive isocyanate group in the polymer molecule.

Isocyanurate ring-containing crosslinked polyurethane polyurea

Disclosed is a process for preparing isocyanurate-type polyisocyanates characterized by reacting an aliphatic or alicyclic diisocyanate compound comprising hexamethylene diisocyanate as a major component in the presence of an isocyanuration catalyst represented by general formula [I], ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 independently represent a hydrocarbon group containing 1 to 20 carbon atoms, or a hydrocarbon group containing one or more hetero atoms; at least two of R.sup.1, R.sup.2 and R.sup.3 may be linked to each other; R.sup.4 indicates a hydrogen atom or a hydrocarbon group containing 1 to 20 carbon atoms; and R.sup.5, R.sup.6 and R.sup.7 independently represent a hydrocarbon group containing 1 to 20 carbon atoms. Diol-modified isocyanurate-type polyisocyanates can be prepared additionally using a hydrocarbon diol in the process.

Process for the preparation of polyisocyanate

The present invention provides an isocyanate prepolymer prepared by reacting an organic di-isocyanate with an unsaturated alcohol dimer having 16 to 24 carbon atoms and/or a hydrogen addition product of the unsaturated alcohol dimer and a process for preparing the same.

Isocyanate prepolymer and process for preparing the same

An urethane coating resin composition comprising as essential components (A) an isocyanurate-type polyisocyanate derived from hexamethylene diisocyanate and containing at least 65% by weight of a mononuclear compound and (B) an acrylic polyol having a number-average molecular weight of 5,000 to 25,000 and a hydroxyl value of 40 to 160.

Urethane coating resin composition

A resin composition comprising (A) a polyisocyanate having an isocyanurate ring obtained by reacting at least one diisocyanate selected from alkylene diisocyanates, cycloalkylene diisocyanates and aralkylene diisocyanates with a diol having 10 to 40 carbon atoms or with a polyester polyol containing 12-hydroexystearic acid as an essential component in the presence of an isocyanuration catalyst, and (B) a nonpolar organic solvent. The composition is useful, for example, as a point, an adhesive or a molding material.

Resin composition comprising an isocyanate having an isocyanurate ring

A process for producing a polyisocyanate containing an isocyanurate ring which comprises reacting at least one diisocyanate compound selected from the group consisting of alkylene diisocyanates, cycloalkylene diisocyanates and aralkylene diisocyanates with a cycloalkylene diol in the presence of an isocyanurating catalyst; and a resin composition for use in non-yellowing fast-drying urethane paints, comprising (A) the aforesaid polyisocyanate and (B) an acrylic polyol having a number average molecular weight of 2,000 to 30,000 and a hydroxyl value of 20 to 200.

Process for producing polyisocyanate and resin composition comprising

A process for producing a polyisocyanate containing an isocyanurate ring, which comprises reacting at least one diisocyanate compound selected from the group consisting of alkylene diisocyanates, cycloalkylene diisocyanates and aralkylene diisocyanates with a diol having a molecular weight of 100 to 1,000 and containing at least 3 hydrocarbon substituents per molecule in the presence of an isocyanurating catalyst. A resin composition for urethane paints comprising the polyisocyanate as an essential ingredient.

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Chiba, Japan

Mitsuo Kase