| 摘要 |
1343610 Polyesters BAYER AG 22 April 1971 [22 April 1970] 10727/71 Heading C3R Polyesters are produced by polycondensing terephthalic acid or an alkyl ester thereof with a diol and 0À03 to 10% by weight, based on terephthalic acid or alkyl ester thereof, of an aliphatic or cycloaliphatic polyhydric alcohol partially esterified with a saturated fatty acid and containing two free OH groups. The examples describe polyesters derived from dimethyl terephthalate, ethylene glycol and glycerol monostearate, pentaerythritol distearate and trimethylol cyclohexane monostearate. Polyesters having a melt viscosity of from 500 to 2000 poises at 280‹ C. comprising units of the formula in which R 1 is a C 1-8 alkylene radical, and 0À02 to 12 mol. per cent, based on the polyester, of units of the formula in which R 2 is a linear or branched aliphatic or cycloaliphatic radical having a functionality of 2 + n, R 3 is H or a C 1-19 alkyl radical, and n is an integer from 1 to 6 are claimed per se. |
