Polysiloxane-containing polyurethane elastomeric compositions

A device or article comprising an amount of a polyurethane elastomeric composition effective to render the device biocompatible, the polyurethane elastomeric composition comprising a hard segment and a soft segment, wherein the soft segment is formed from (a) a combination of at least one polyether macrodiol and at least one polycarbonate macrodiol;

• and (b) at least one polysiloxane macrodiol of formula (I):
• wherein
• R1, R2, R3, R4, R5, and R6 are each independently an optionally substituted straight chain, branched or cyclic, saturated or unsaturated hydrocarbon radical;
• and
• n is an integer from 1 to 100.

A device or article comprising a polyurethane elastomeric composition comprising a hard segment and a soft segment, wherein the soft segment is formed from

• (a) a combination of at least one polyether macrodiol and at least one polycarbonate macrodiol, wherein the polyether macrodiol is a compound of the formula:
• HO—[(CH2)m—O]n—H
• wherein
• m is an integer of 4 or more;
• and
• n is an integer from 2 to 50;
• and
• (b) a polysiloxane macrodiol of formula (I):
• wherein
• R1, R2, R3, R4, R5, and R6 are each independently an optionally substituted straight chain, branched or cyclic, saturated or unsaturated hydrocarbon radical;
• and
• n is an integer from 1 to 100;
• and
• wherein the device is artificial leather, a shoe sole, a cable sheathing, varnish, a coating, a structural component for a pump or vehicle, a mining ore screen, a conveyor belt, a laminating compound, a textile, a separation membrane, a sealant or an adhesive component.

A process for preparing a polyurethane elastomeric composition comprising:

• a) mixing a polysiloxane macrodiol, a polyether macrodiol, a polycarbonate macrodiol, and a chain extender;
• and
• b) reacting the mixture with a diisocyanate to yield a polyurethane elastomeric composition comprising a hard segment which is the product of a diisocyanate and a chain extender;
• and a soft segment which is the product of:
• i) at least one polysiloxane macrodiol;
• and
• ii) a combination of at least one polyether macrodiol and at least one polycarbonate macrodiol, wherein the polyether macrodiol is a compound of the formula:
• HO—[(CH2)m—O]n—H
• wherein
• m is an integer of 4 or more;
• and
• n is an integer from 2 to 50.

A process for preparing a polyurethane elastomeric composition comprising:

• a) reacting a diisocyanate with a polysiloxane macrodiol, a polyether macrodiol, and a polycarbonate macrodiol, to form a prepolymer having terminally reactive diisocyanate groups;
• and
• b) reacting the prepolymer with a chain extender to yield a polyurethane elastomeric composition comprising a soft segment which is the product of
• (a) at least one polysiloxane macrodiol;
• and
• (b) a combination of at least one polyether macrodiol and at least one polycarbonate macrodiol, wherein the polyether macrodiol is a compound of the formula:
• HO—[(CH2)m—O]n—H
• wherein
• m is an integer of 4 or more;
• n is an integer from 2 to 50;
• and
• wherein the polyurethane elastomeric composition comprises a hard segment which is the product of a diiocyanate and a chain extruder.

A process for preparing a polyurethane elastomeric composition comprising a hard segment and a soft segment comprising:

• a) forming a prepolymer having terminally reactive diisocyanate groups, and
• i) internal polysiloxane groups;
• and
• ii) internal polyether and polycarbonate groups;
• and
• b) reacting the prepolymer with a chain extender to yield a polyurethane elastomeric composition,
• wherein the polyether groups in the prepolymer, are provided by reaction of a polyether macrodiol of the formula:
• HO—[(CH2)m—O]n—H
• wherein
• m is an integer of 4 or more;
• n is an integer of from 20 to 50, and
• wherein the polysiloxane is from about 60-98 wt-% of the soft segment, and the polyether and the polycarbonate is from about 2-40 wt-% of the soft segment.