Methods for making thermoplastic aliphatic urethane/urea elastomers and molding compositions

A method for making a molding composition, the method comprising:

• a) reacting together the following components of an aliphatic thermoplastic urethane/urea composition by continuous processing or by a one-shot batch process:
• (i) a polyol component comprising at least one polyether polyol having a molecular weight of from 1000 to 10,000 Da and an unsaturation level less than or equal to 0.04 meq/g;
• (ii) an aliphatic or cycloaliphatic diamine having a molecular weight of up to 4000, in an amount of up to about 5% of the composition;
• (iii) an isocyanate component comprising at least one aliphatic organic diisocyanate;
• (iv) a chain extender which is not within the scope of (ii), in an amount of 4% to 15% of the composition;
• (v) optionally, a UV stabilizing agent;
• (vi) optionally, an antioxidant;
• (vii) optionally, a pigment;
• (viii) a catalyst which promotes urethane formation;
• and
• (ix) optionally, a mold release agent,
• b) adding a polyolefin-based modifier,
• c) optionally, adding a UV stabilizing agent,
• d) optionally, adding an antioxidant,
• e) optionally, adding a pigment,
• f) optionally, adding a mold release agent, and
• g) optionally, adding an ionomer,
• provided that no external compatibilizing agent is added to the molding composition.