Hitachi Chemical Company, Ltd.

Hitachi, Ltd.

Isao Uchigasaki

Iwao Maekawa

Akira Kageyama

Hiroshi Nishizawa

Yoshiyuki Mukoyama

Hidetaka Sato

Shozo Kasai

Yasunori Okada

Yuichi Osada

Noboru Monma

Toyoji Oshima

Fumio Nakano

Seikichi Tanno

Daisuke Makino

Hideyuki Tobita

Shunichiro Uchimura

Ren Ito

Eiji Omori

Hisao Tanaka

Sakato Kumazaki

Tutomu Sarudate

Shunji Masuda

Shouzi Takamizawa

Mitsuo Obara

Yoshinori Oyama

Takeshi Tanno

Takehisa Sasaki

Naoki Yokoyama

A composition of materials comprising a polyamide acid-silicone intermediate obtained by reacting (a) a diaminoamide compound of the formula: ##STR1## wherein Ar and Y are as defined in the specification, (b) a diaminosiloxane, (c) a diamine, and (d) an aromatic tetracarboxylic acid dianhydride can form a protective film used in a semiconductor device excellent in adhesive properties, heat resistance and preventing soft errors due to .alpha.-rays.

Compositions of materials for forming protective film in semiconductor

A coating composition comprising (A) a thermoplastic resin having a glass transition temperature of 0.degree. to 80.degree. C., (B) a compound having 2 or more hydroxyl groups in the molecule, (C) a thixotropic agent and (D) a solvent, and said coating composition having a viscosity of 3 to 50 poises at 25.degree. C. and a thixotropy of 2 or more can give a moistureproof insulating coating film with uniform and large thickness and very few bubbles by one-time treatment over packing circuit boards.

Moistureproof insulating coating composition for packing circuit boards

A heat resistant resin produced by reacting (A) a polyamideimide resin with (B) an alcohol component and (C) an acid component with heating is soluble in a cresol type solvent and gives coatings excellent in heat resistance, thermal shock resistance, wear resistance, resistance to hydrolysis, etc., suitable for enamelled wire.

Heat resistant resin and process for producing the same

Heat resistant resin composition comprising reaction product of

Resin composition

Flyback transformers having good adhesiveness, crack resistance, arc resistance, without producing corona discharge can be produced by insulation treating flyback transformers with a low-shrinkage resin composition comprising (a) an unsaturated polyester produced by reacting partially esterified dicyclopentadiene carboxylic acid, which has been obtained by reacting dicyclopentadiene or hydroxylated dicyclopentadiene, and maleic acid or anhydride, with one or more polyhydric alcohols, (b) a monomer having a vinyl group and (c) a low-shrinkage agent.

Process for producing flyback transformer

A resin composition comprising (A) 25 to 45 parts by weight of an unsaturated polyester having special structure, (B) 40 to 60 parts by weight of polymerizable monomer such as styrene, and (C) 4.5 to 15 parts by weight of a polystyrene, has low shrink properties and excellent electrical properties when molded, particularly by casting.

Resin composition with low shrinkage

A resin composition which comprises (A) 50 to 90 parts by weight of an unsaturated ester oligomer produced by reacting a glycol, hydroxylated dicyclopentadiene, and at least one unsaturated dibasic acid or anhydride thereof until an acid value of less than 40, (B) 50 to 10 parts by weight of one or more polymerizable monomers, and (C) 3 to 15 parts by weight of polystyrene based on 100 parts by weight of the total of the components (A) and (B), can give molded articles having low shrink properties and improved color shading, cracks, etc.

Resin composition having low shrink properties

Resinous composition

A resinous composition comprising (1) 40 - 90 parts by weight of one or more oligomers obtained by reacting a polyvalent alcohol or its derivative with a fatty acid derived from oils and fats, and a monobasic acid of the formula, ##STR1## wherein X is an .alpha.,.beta.-unsaturated hydrocarbon group having 2 or 3 carbon atoms, and (2) 10 - 60 parts by weight of one or more polymerizable monomers having at least one polymerizable double bond in the molecule, is particularly suitable for use in coating, and casting for electric insulation. The resinous composition can be used in solventless and can prevent bad odor of styrene. Coating films obtained from the resinous composition are excellent in resistance to blocking, resistance to solvents, resistance to stains, hardness, gloss, flexibility and the like.

A method which comprises drawing a part of the reaction liquid from a reactor for unsaturated polyesters, bringing the drawn liquid into contact and reaction with a gaseous starting material or a liquid starting material capable of being converted into vapor on reaction, for example, an alkylene oxide by means of tubular mixing and recycling this reaction liquid to the reactor thereby preventing increase in pressure of the reactor. An apparatus which comprises a reactor having a confined or open structure, a tubular mixer where a part of the reaction liquid drawn from the reactor is mixed with a gaseous starting material or a liquid starting material capable of being converted into vapor on reaction, which is blown through a nozzle, to cause a vapor-liquid reaction, and a liquid circulation pump for supplying the liquid drawn from the reactor to the tubular mixer and recycling the vapor-liquid reaction product to the reactor.

Method for conducting a vapor-liquid contact reaction semi-batchwise

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Hitachi, Japan

Isao Uchigasaki