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-polyacetone 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.
Claims16
A method of producing polymer blends having modified surface properties, comprising the step of polymerizing monomer starting materials for a first polymer in the presence of a linear polysiloxane-polylactone second polymer having the formula:
- ##STR8## 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 ##STR9## 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 or 1 to 6 carbon atoms;
- R.sub.5 ' is --R.sub.7 --O--, --R.sub.7 --NR.sub.8 --, ##STR10## R.sub.5 is --O--R.sub.7 --, --NR.sub.8 --R.sub.7 --;
- ##STR11## R.sub.7, R.sub.9 and R.sub.11, are independently --CH.sub.2 .sbsb.q, q is an integer from 1 to 20;
- ##STR12## 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.
A method of producing modified polymers having modified surface properties, comprising the step of polymerizing monomer starting materials for a first polymer in the presence of a linear polysiloxane-polyactone second polymer having the formula:
- ##STR13## 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 ##STR14## 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;
- R.sub.5 ' is ##STR15## R.sub.5 is ##STR16## R.sub.7, R.sub.9 and R.sub.11, are independently --CH.sub.2 --.sbsb.q, q is an integer from 1 to 20;
- ##STR17## 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,
- whereby said polysiloxane-polyactone second polymer is chemically linked to said first polymer by urethane, urea linking groups or by ester linking groups.
Dependencies are inferred from the claim text.