Sumitomo Chemical Company, Limited

Yoshinobu Matsuda

Seimei Yasui

Takanobu Noguchi

Masahiko Hata

Noboru Fukuhara

Yukio Suzuki

Shigeo Fujita

Masakazu Sagou

Akio Sasaki

Toshio Ishihara

A process for crystal growth of III-V group compound semiconductor, which comprises pyrolyzing, in a gas phase, a material consisting of an organometallic compound and/or a hydride in the presence of an organic compound containing an oxygen atom-carbon atom direct bond, used as a dopant to grow a III-V group compound semiconductor crystal layer containing at least aluminum, of high electric resistance. Said process can grow a compound semiconductor layer of high electric resistance by the use of a dopant which enables the independent controls of oxygen concentration and aluminum concentration and which has a small effect of oxygen remaining.

Process for crystal growth of III-V group compound semiconductor

A zinc selenide or zinc selenide-sulphide epitaxial crystal is grown at a growth temperature of about 180.degree.-320.degree. C. by organometallic chemical vapor deposition by using zinc alkyl and hydrogen selenide and/or hydrogen sulphide. An as-grown crystal presented an n conductivity type low resistivity and exhibited a narrow near-band gap emission peak. Besides a crystal of the same material as the epitaxial layer, crystals of group III-V, group IV, and so forth having the same or similar crystal structure as the epitaxial layer can be used as an underlayer for the growth.

Vapor phase epitaxial growth method of zinc selenide and zinc

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

A sulfonated product of butadiene or isoprene oligomer of the formula: ##STR1## wherein one of R.sub.1 and R.sub.1 ' is hydrogen or methyl and another one is hydrogen; R.sub.2 ' is hydrogen or methyl; one of X.sub.1 and X.sub.2 is --SO.sub.3 M and another one is hydrogen; a and b are each an integer satisfying the conditions; n = a + b, 2 &lt; n &lt; 40 and 0 &lt; b; M is hydrogen, Na, K, Li or --NR.sub.3 R.sub.4 R.sub.5 R.sub.6 ; and R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are each hydrogen or an alkyl having 1 to 6 carbon atoms, which has specific properties, particularly excellent hard water resistance, and is useful for various utilities, for instance, as a surfactant, emulsifier, or the like, and a process for the production of the sulfonated product.

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Ibaraki, Japan

Yoshinobu Matsuda