Patent ID: 9587107
Date: 2017-03-07
CPC Classifications: B29B,B29C,B29K,B33Y,C08G,C08L

Claim:
1. A process for making a heat-treated polymer powder composition suitable for selective laser sintering, roto-molding or powder coating, said composition comprising at least two semicrystalline or crystallizable polyetherketoneketone polymorphs having at least two different melting points, said process comprising at least the steps of (a) determining heat treating conditions by selecting a temperature less than 20° C. below a melting point of a highest melting crystalline polymorph and at or above a melting point of another crystalline polymorph, and (b) heat-treating the polymer composition at said temperature less than 20° C. below the melting point of the highest melting crystalline polymorph and at or above the melting point of the other crystalline polymorph(s), for a time that increases the content of the highest melting crystalline polymorphs relative to the other crystalline polymorph(s) in the polymer composition, and wherein the polyether ketone ketone comprises repeating units represented by Formulas I and II: where A is a p,p′-Ph-O-Ph- group, Ph is a phenylene radical, B is p-phenylene, and D is m-phenylene, wherein the T:I isomer ratio is in the range of from 60/40 to 80/20.