Mitsubishi Gas Chemical Company, Inc.

Tsuyoshi Isozaki

Masahiro Kurokawa

Akihiro Honma

Takeshi Koyama

Hidenori Kimbara

Hiroyuki Mishima

Hiroka Tanisake

Norio Nagai

A prepreg comprising a thermosetting resin (D) composition containing, as an essential component, an aluminum hydroxide-boehmite composite (A) obtained by hydrothermal treatment of aluminum hydroxide, and a substrate (I), a laminate using the above prepreg, and a metal-foil-clad laminate using the above laminate.

Prepreg and laminate

A process for the preparation of a powder coating composition, wherein 5-90% by weight of at least one monomeric compound selected from glycidyl group-containing unsaturated compounds and methylglycidyl group-containing unsaturated compounds is copolymerized with 95-10% by weight of an ethylenically unsaturated monomer in methanol to obtain a resin solution. The resin solution is spray-dried to obtain a powdery resin. Alternatively, the resin solution is fed to an extruder having a die and a plurality of vent ports and extruded through the die, while removing volatile matters through the vent ports, to obtain extrudates. The extrudates are pulverized to obtain a powdery resin.

Process for the preparation of powder coating composition

There is disclosed a process for producing a glycidyl ester of acrylic acid or methacrylic acid which comprises the steps of neutralizing acrylic acid or methacrylic acid with a carbonate or a bicarbonate of an alkali metal in an excess amount of epichlorohydrin while an oxygen-containing gas is blown into the liquid reaction system; subjecting water formed by the neutralization and epichlorohydrin to azeotropic distillation to discharge them outside the reaction system and to form an alkali metal salt of acrylic acid or methacrylic acid; adding a quaternary ammonium salt as a catalyst to the reaction system to react the alkali metal salt of the acid with the epichlorohydrin and thus synthesize the glycidyl ester of the acid; cooling the liquid reaction product while recovering part of the excess epichlorohydrin under reduced pressure; adding aqueous solution of an alkali hydroxide to the liquid reaction product to separate into aqueous layer and organic layer; adding a catalyst deactivator to the organic phase; and subsequently distilling the organic layer to separate the glycidyl ester of the acid while blowing an oxygen-containing gas into the organic layer. The above process makes it possible to efficiently produce a highly pure glycidyl ester of acrylic acid or methacrylic acid in high yield with minimized contents of impurities.

Process for producing glycidyl ester of acrylic acid or methacrylic acid

There are disclosed a process for producing glycidyl acrylate or glycidyl methacrylate by the transesterification of glycidol and methyl methacrylate, etc. which process comprises carrying out the transesterification in the presence of a polymerization inhibitor by using, as a catalyst, a quaternary ammonium salt represented by the general formula (I) or a quaternary phosphonium salt represented by the general formula (II)

Process for producing glycidyl acrylate or glycidyl methacrylate

A process for producing a bistrimellitic imide of the formula (2) ##STR1## wherein X is an aliphatic group having at least 2 carbon atoms, an alicyclic group or an aromatic group, which comprises reacting a trimellitic anhydride with a diamine of the formula (1)

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Tokyo, Japan

Tsuyoshi Isozaki