Nova Patents
USRE31270E

Random elastomeric copolyesters

Abstract

This record has no abstract on file.

Term

Term ended

Expired 17 November 1998, 27.9 years ago.

  1. Priority
  2. Filed
  3. Granted
  4. Expired
  5. Today

6 claims: 1 independent, 5 dependent

  1. 1.
    1. As compositions of matter, elastomeric, random, linear copolyesters having intrinsic viscosities ranging from about 0.6 to about 1.0 as determined in a 60/40 by volume mixed solvent system of phenol and tetrachloroethane at 30.degree. C., and melting points ranging from about 180.degree. C. to about 220.degree. C., said copolyester comprising .[.the polymeric reaction product of.]. a mixture of .[.reactants.]. .Iadd.units in the polymer chain .Iaddend.consisting of .Iadd.the polymeric reaction product from .Iaddend. PA1 (a) terephthalic acid or a lower C.sub.1 -C.sub.4 dialkyl ester thereof, PA1 (b) dimer acid, PA1 (c) a poly(tetramethylene oxide)glycol having a molecular weight ranging from about 1000 to about 2000 and PA1 (d) 1,4-butane diol in which mixture the amount of terephthalic acid or lower C.sub.1 -C.sub.4 dialkyl ester thereof ranges from about 99.9 to about 85.0 mole percent and the amount of dimer acid ranges from about 0.1 to about 15.0 mole percent, said percentages being based on the total number of moles of said acid constituents or reactive equivalents thereof in said mixture and in which mixture the amount of poly(tetramethylene oxide)glycol ranges from about 2.0 to 12.0 mole percent and the amount of 1,4-butane diol ranges from about 98.0 to about 88.0 mole percent, plus a molar excess of said 1,4-butane diol ranging from about 5.0 to about 120 percent, said mole percentages being based on the total number of moles of said glycols, less the molar excess of the 1,4-butane diol, in said mixture.