Sumitomo Chemical Company, Limited

Masakatsu Yoshimura

Tamaki Ishii

Shinichi Yachigo

Hideo Nagasaki

Tatsuo Kaneoya

Takeo Fujii

Akira Fukasawa

Kenji Takahashi

Tetsuo Yamaguchi

Yukoh Takahashi

Yuzo Maegawa

Chinehito Ebina

Eizo Okino

Shinzaburo Masaki

Hiroki Yamamoto

Kikumitsu Inoue

Norio Kotera

Takashi Miyaoka

Masatoshi Uegaki

Shin-ichi Yachigo

Masahito Umehara

Dynamic properties of vulcanized rubber are improved, without accelerating scorching property remarkably nor deteriorating flex-cracking resistance, by incorporating in a filler-containing natural or synthetic rubber composition, a dinitrodiamine derivative represented by the general formula ##STR1## wherein A represents a divalent aliphatic group, a divalent cycloaliphatic group, a divalent aromatic group or a group represented by the formula --CH.sub.2 --X--CH.sub.2 --, wherein X represents a cycloalkylene group or a phenylene group, provided that if A represents a cycloaliphatic group or an aromatic group, the two carbon atoms in A which are bonding to the nitrogen atom are not vicinal to each other; R and R' independently represent hydrogen atom or an alkyl group having 1-12 carbon atoms and may conjointly form a ring; and R' represents hydrogen atom, an aliphatic group, a cycloaliphatic group or an aromatic group. A process for producing the dinitrodiamine derivatives is also disclosed.

Rubber composition

A styrene polymer is stabilized by incorporating into said styrene polymer

Stabilized styrene polymer

Process for producing 2,2,4-trimethyl-1,2-dihydroquinoline by reacting aniline with an acetone compound at 80.degree.-150.degree. C. in the presence of, as catalyst, both hydrogen fluoride and boron trifluoride.

Process for producing 2,2,4-trimethyl-1,2-dihydroquinoline

A method for purifying 1-aminoanthraquinone which comprises previously subjecting a crude 1-aminoanthraquinone to a removal treatment of inorganic impurities so that their content is reduced to not more than 4 wt. % as converted to ash basis or to a removal treatment of iodine-consuming reductive inorganic impurities so that their content is reduced to not more than 2 wt. % as converted to consumed iodine basis, and then rectifying the 1-aminoanthraquinone.

Method for purifying 1-aminoanthraquinone

There is provided a 2,2,6,6-tetramethylpiperidine derivative represented by the formula (I), ##STR1## wherein R.sub.1 and R.sub.2 independently represent a hydrogen atom or methyl group, and R.sub.3 represents an alkylene group having one to four carbon atoms. A method for producing said derivatives is also provided.

2,2,6,6-Tetramethylpiperidine and its production

A process for producing an aminoanthraquinone, which comprises feeding of a nitroanthraquinone and an alkali sulfide continuously into a reaction zone kept at a temperature of from 80.degree. to 140.degree. C., the alkali sulfide being used in an amount of 1.6 or more times the mole number of the nitro group, and withdrawing the reaction product continuously or intermittently from the reaction zone; and an aminoanthraquinone obtained by the above process which is one of the most important intermediates of anthraquinone dyes.

Process for producing aminoanthraquinone

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Sakai, Japan

Masakatsu Yoshimura