Teijin Limited

Hiroshi Sakai

Yoshihiko Takeuchi

Michiyuki Tokashiki

Noritsugu Saiki

Shizuka Kurisu

In a process for preparing soft polyesters which comprises reacting (A) terephthalic acid and/or its ester-forming derivative, (B) tetramethylene glycol and/or its ester-forming derivative and (C) a poly(oxyalkylene) glycol having a molecular weight of 500 to 5,000 and a ratio of the number of carbon atoms to that of oxygen atoms of 2 to 4.5, the improvement wherein after the reduced viscosity of the reaction product of the components (A), (B) and (C) has reached 0.1 (dl/g), the reaction product is further reacted with (D) a low-molecular-weight ester compound and/or a high-molecular-weight ester compound containing a terephthalic acid residue and an ethylene glycol residue or a low-molecular-weight ester compound and/or a high-molecular-weight ester compound containing a terephthalic acid residue and a 1,4-cyclohexane dimethanol residue to form a polyester-polyether block copolymer.

Process for preparing soft transparent polyether polyester block

In a process for preparing a block copolyester elastomer having a softening point of at least 120.degree. C. by reacting an aromatic polyester (I) having a reduced viscosity of at least 0.4 and derived from an aromatic dicarboxylic acid or its ester-forming derivative as a main acid component with an aliphatic polyester (II) having a reduced viscosity of at least 0.4 and derived from an aliphatic dicarboxylic acid or an aliphatic hydroxycarboxylic acid or an ester-forming derivative of each of these acids in the molten state; the improvement wherein

Process for preparing polyester elastomers

A process for the preparation of alkyltetralins which comprises feeding an alkenylbenzene into a reaction zone continuing a fixed bed of an acidic cyclization catalyst, and cyclizing it in the liquid phase at a temperature not higher than about 300.degree. C., characterized in that: I. at least a part of the reaction mixture containing the unreacted alkenylbenzene, which has been withdrawn from said reaction zone and in which the conversion of alkenylbenzene is below the intended final conversion, is cooled, and at least a part of the cooled reaction product in an amount sufficient to adjust the temperature of the reaction zone to not higher than about 300.degree. C. is recycled to said reaction zone, and Ii. the remainder of the reaction product is led into another reaction zone containing a fixed bed of acidic cyclization catalyst, and without the aforesaid recycling, further cyclized in the liquid phase until the intended final conversion is attained.

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Iwakuni, Japan

Hiroshi Sakai