Copolyetherester based on poly (propylene oxide) glycol blocked

Details Copolyetherester based on poly (propylene oxide) glycol blocked Copolyetherester based on poly (propylene oxide) glycol blocked

1986-05-16

1987-08-18

Phynes, Lucille M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528301, C08G 6366

Patent

active

046878351

ABSTRACT:
A copolyetherester comprising a random head-to-tail copolymer of 25-55 percent by weight of short-chain ester units; at least 75 mole percent is composed of 1,4-butylene terephthalate units, and long-chain ester units derived from ethylene oxide-capped poly(propylene oxide) glycol having an ethylene oxide content of from 15-35 percent by weight and a number average molecular weight ranging from 1500-2800. The copolyetherester displays improved physical properties, such as a higher elongation at rupture, notched tensile impact energy and tearing energy, if its relative viscosity (1 g of polymer in 100 g m-cresol at 25.degree. C.) is in the range of 2,45 to 5,0 and the melt index MFI is between ##EQU1## It may be prepared by melt condensation of a copolyetherester having a relative viscosity of 1,8 to 2,5 and subsequently subjecting it to post-condensation in the solid phase for a sufficient period to obtain a polymer corresponding to said viscosity and melt index.

REFERENCES:
patent: 3652713 (1972-03-01), Okazaki et al.
patent: 4013624 (1977-03-01), Hoeschele
patent: 4205158 (1980-05-01), Hoeschele
patent: 4251652 (1981-02-01), Tanaka et al.
patent: 4262114 (1981-04-01), Wagener et al.
patent: 4321341 (1982-03-01), Neuberg et al.
Research Disclosure, No. 186, pp. 554, Abstract No. 18610, "Improvements in and Relating to Tennis Balls".

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