Sumitomo Chemical Company, Limited

Masakazu Sagou

Takanobu Noguchi

Seimei Yasui

Yoshiki Toyoshima

Yoshinobu Matsuda

Shunji Iwahashi

Masahiro Yamasaki

Hideyo Fujii

Junzo Saito

Formaldehyde is prepared by dehydrogenating methanol in the substantial absence of oxygen and in the presence of a catalyst which is a zinc-silicon complex oxide obtained by mixing a solution containing a zinc salt of an inorganic or organic acid with a solution containing an inorganic silicate compound, or by adding urea to a solution containing a zinc salt of an inorganic or organic acid and an organic silicate compound, until a precipitate is formed, and subsequently baking the precipitate at at least 500.degree. C.

Process for producing formaldehyde

An improved process for producing formaldehyde in a gas-phase reaction wherein the dehydrogenation of methanol is conducted with a catalyst, which is zinc oxide and/or indium oxide or a mixture of silica and one or more of these oxide, to give formaldehyde in a high yield.

Process for the preparation of a phenol resin modified with a liquid polybutadiene which comprises reacting a polybutadiene having a number average molecular weight of 150 to 5,000 with a phenol in the presence of an acid catalyst to obtain a composition which consists of a polybutadiene-phenol adduct and unreacted phenol, in said polybutadiene-phenol adduct, one molecule of phenol per 3 to 8 butadiene units being added to the polybutadiene, and reacting the composition of a polybutadiene-phenol adduct with a formaldehyde in the presence of a basic catalyst, said basic catalyst comprising a primary amine of the formula: R--NH.sub.2 wherein R is a hydrocarbon group having 1 to 20 carbon atoms in an amount of 0.01 to 0.5 mole per 1 mole of the phenol used for the preparation of the composition which is used alone or in combination thereof with other basic compound. Said resin composition thus prepared is useful for the preparation of a laminated sheet having excellent curing characteristics, particularly excellent electrical characteristics, punchability and flexibility.

Process for preparation of a phenolic-polybutadiene-HCHO resin

Process for the preparation of a resin composition which comprises reacting a polybutadiene having a number average molecular weight of 150 to 10,000 and 1,4-structure of at least 80% by weight with a phenol in the presence of an acid catalyst to obtain a composition which consists of a polybutadiene-phenol adduct and unreacted phenol, in said polybutadiene-phenol adduct, one molecule of phenol per 3 to 8 butadiene units being added to the polybutadiene, and reacting the polybutadiene-phenol adduct composition with a formaldehyde in the presence of a basic catalyst. Said resin composition thus prepared is useful for the preparation of a laminated sheet having excellent curing characteristics, particularly excellent electrical characteristics, punchability and flexibility.

Process for preparation of resin composition useful for laminated sheet

The surface of a plastic substrate is effectively vapor plated with a metal by coating said surface with a coating composition comprising the following components dissolved in a solvent prior to the vapor plating: (A) (i) a co-partial hydrolysis product of an organosiloxane compound of the formula: R.sub.n Si(OR').sub.4-n (wherein n is an integer of 1 to 3, R is a hydrocarbon group having 1 to 6 carbon atoms and R' is an alkyl group having 1 to 4 carbon atoms) and a tetraalkoxysilane, or (ii) a mixture of each partial hydrolysis product of said organosiloxane compound and said tetraalkoxysilane, or (iii) a mixture of said co-partial hydrolysis product (i) and said mixture of each partial hydrolysis product (ii), the amount of the partial hydrolysis product of said tetraalkoxysilane (calculated as SiO.sub.2) being 5 to 100 parts by weight to 100 parts by weight of the partial hydrolysis product of said organosiloxane compound (calculated as R.sub.n SiO.sub.(4-n)/2 wherein n and R are each as defined above); and (B) (i) a copolymer of at least one of alkyl acrylates and alkyl methacrylates with at least one of hydroxyalkyl acrylates and hydroxyalkyl methacrylates, and (ii) an etherified methylolmelamine, the amounts of said copolymer (i) and said etherified methylolmelamine (ii) being 5 to 200 parts by weight and 0 to 150 parts by weight, respectively, based on 100 parts by weight of the partial hydrolysis product of the organosiloxane compound (calculated as R.sub.n SiO.sub.(4-n)/2 wherein n and R are each as defined above).

Growing community of inventors

Osaka, Japan

Masakazu Sagou