Kraton Polymers U.S. LLC

Michael Alan Masse

David J St Clair

Dale Lee Handlin, Jr

Lie Djiauw

James R Erickson

Ronald J Hoxmeier

Alan Michael Batt

Sudha Mohindra

Christinus Cornelis Van De Kamp

The present invention provides melt processable, bleach resistant durable fibers having an elastic recovery above 50% after extension to 160% elongation and a stress relaxation below 50% after extension to 150% for 30 minuets which are formed from a soft polyurethane elastomer. This elastomer is comprised of (a) from 75 to 90% weight of a polydiene diol having up to about two terminal hydroxyl groups per molecule and a number average molecular weight between 500 and 20,000, (b) from 9 to 25% weight of a diisocyanate, and (c) from 0.8% to 5% weight of a chain extender which is a low molecular weight aliphatic diol, or a mixture of the low molecular weight aliphatic diol and from 0.1 to 4.0 mol % of a diamine wherein the hard segment content of the polyurethane elastomer is from about 10 to about 30% weight. The present invention further provides a polyurethane elastomer.

Melt processable, bleach resistant, durable fibers having high elastic recovery and low stress relaxation from polyurethane elastomers

The present invention provides block copolymers which have reduced solvent sensitivity and which overcome the foregoing disadvantages. In one embodiment of the present invention, there is provided an asymmetric block copolymer of the structure A-B-C-A wherein each A block is formed of a vinyl aromatic hydrocarbon, preferably styrene, and has a weight average molecular weight of 5,000 to 50,000. B is a polybutadiene block having a weight average molecular weight of 1,000 to 15,000 and a vinyl content of less than 25% by weight, and C is an elastomeric conjugated diene polymer block having a weight average molecular weight of 25,000 to 200,000 and has a vinyl content of 30 to 90%, preferably 35 to 80%, and most preferably 35 to 70% by weight. In the second embodiment of the present invention, there is provided a hydrogenated block copolymer of the formula A-B-C-B-A wherein A, B, and C have the definitions set forth above.

Block copolymers containing both polystyrene and low vinyl content polydiene hard blocks

The present invention provides melt processable, bleach resistant durable fibers having an elastic recovery above 50% after extension to 160% elongation and a stress relaxation below 50% after extension to 150% for 30 minutes which are formed from a soft polyurethane elastomer. This elastomer is comprised of (a) from 75 to 90% weight of a polydiene diol having up to about two terminal hydroxyl groups per molecule and a number average molecular weight between 500 and 20,000, (b) from 9 to 25% weight of a diisocyanate, and (c) from 0.8 to 5% weight of a chain extender which is a low molecular weight aliphatic diol, or a mixture of the low molecular weight aliphatic diol and from 0.1 to 4.0 mol % of a diamine wherein the hard segment content of the polyurethane elastomer is from about 10 to about 30% weight. The present invention further provides a polyurethane elastomer.

Extruder process for making thermoplastic polyurethanes

Monohydroxylated diene polymers and epoxidized derivatives thereof

Radial block copolymers that exhibit one phase melt behavior at a temperature below the degradation temperature of the radial block copolymer. The radial block copolymers have a plurality of arms, wherein each arm has a numerical average molecular weight of from about 5,000 to about 30,000, each arm includes a monoalkenyl aromatic hydrocarbon block and a hydrogenated conjugated diolefin block, and the monoalkenyl aromatic hydrocarbon is preferably present in an amount of from about 10 wt % to about 40 wt % of the radial block copolymer. Also disclosed is a process for preparing the one phase melt block copolymers.

Radial hydrogenated block copolymers showing one phase melt behavior

Method for producing mixed polyol thermoplastic polyurethane compositions

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Katy, TX, United States of America

Michael Alan Masse