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Polysiloxane-polylactone block copolymers

  • US 4,963,595 A
  • Filed: 12/22/1988
  • Issued: 10/16/1990
  • Est. Priority Date: 01/04/1985
  • Status: Expired due to Term
First Claim
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1. A method of increasing the crystallization rate of polyethylene terephthalate by blending therewith a polysiloxane/polycaprolactone block copolymer of the formula (I):

  • ##STR6## wherein n is an integer from 1 to about 200;

    R1, R2, R3 and R4 are independently linear or branched alkyl, alkenyl, haloalkyl, or haloalkenyl of 1 to 6 carbon atoms;

    aryl of 5 to 7 carbon atoms;

    aralkyl of 6 to 8 carbon atoms;

    A and A'"'"' are independently ##STR7## p is an integer from 0 to 6;

    m is an integer from 1 to about 250;

    R6 is hydrogen or linear or branched alkyl of 1 to 6 carbon atoms;

    ##STR8## where r, t and w are independently integers from 1 to 6 and v is an integer from 1 to about 100;

    R8 and R10 are independently hydrogen or alkyl of 1 to 6 carbon atoms.

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