Daicel Chemical Industries, Ltd.

Kuraray Co., Ltd.

Takeshi Horikawa

Hidetaka Kojima

Masahiro Kagotani

Kenichi Sasaki

Takatsugu Ishido

A process for preparing polyamide elastomers is provided which process comprises reacting a polyamide-forming component having carboxyl groups at both ends thereof with polyoxyalkylene glycol(s) at least 10 wt. % of which comprises a polyoxy-2-methyl-1,3-propylenediol having a number-average molecular weight of about 400 to 10,000. The polyamide-forming component forms a polyamide block having a recurring unit of the formula: ##STR1## in which n represents a positive integer of 5 to 11, and/or ##STR2## in which l represents a positive integer of 6 to 20 and m represents a positive integer of 4 to 20. The obtained polyamide elastomers have excellent low-temperature properties and elastic recovery.

Polyamide elastomer from carboxy terminated polyamide and

In a process for producing an aldehyde by hydroformylating allyl alcohol with carbon monoxide and hydrogen gas in the presence of a catalyst comprising a rhodium compound and a tertiary phosphine in an organic solvent and separating the resulting aldehyde with water extraction from the reaction mixture, the catalyst is maintained and recovered in the activity by treating the catalyst-containing solution in the organic solvent with a gaseous mixture of carbon monoxide and hydrogen gas after the water extraction step.

Process for treating hydroformylation catalyst

A process for preparing polyester elastomers from a dicarboxylic acid, mainly an aromatic dicarboxylic acid, or an ester-forming derivative thereof, a low molecular weight glycol, mainly 1,4-butanediol, and a polyoxyalkylene glycol is provided. This process is characterized in that at least 10 wt. % of the polyoxyalkylene glycol comprises a poly(oxy-2-methyl-3,3-propylene)diol. The obtained polyester elastomers have excellent low-temperature properties and elastic recovery.

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Himeji, Japan

Takeshi Horikawa