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US 4,963,595 AGranted
Polysiloxane-polylactone block copolymers
AssigneeThoratec Laboratories Corporation
InventorsRobert S. Ward, Judy S. Riffle
Life of this patent
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Abstract
Novel linear polysiloxane-polylactone block copolymers are useful as surface modifying additives due in part to their miscibility with a wide variety of base polymers. A particularly preferred polysiloxane-polycaprolactone linear blocked copolymer is miscible with nylon and is useful for forming surface modified nylon products.
Claims5
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;
- R.sub.1, R.sub.2, R.sub.3 and R.sub.4 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;
- R.sub.6 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;
- R.sub.8 and R.sub.10 are independently hydrogen or alkyl of 1 to 6 carbon atoms.
6 more elements
Dependencies are inferred from the claim text.