Polymer composition for selective sintering

• Main Authors: BASHEER ZAHIR, GU HAO
• Format: Patent
• Language: Chinese; English
• Published: 11.09.2020
• Subjects: ADDITIVE MANUFACTURING TECHNOLOGY; ADDITIVE MANUFACTURING, i.e. MANUFACTURING OFTHREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVEAGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING,STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING; CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING

The present invention relates to a polymer composition for the production of shaped objects via selective sintering, wherein the polymer composition comprises a thermoplastic polyester selected from poly(ethylene terephthalate), polyethylene naphthalate), poly(ethylene furanoate), poly(trimethylene terephthalate), poly(ethylene succinate), or poly(hydroxyl butyrate), wherein not less than 10.0 wt%of the thermoplastic polyester has been subjected to a thermal treatment. Such polymer composition allows for the production of an article having a continuous use temperature of not lower than 100 DEG C, and results in a low change of molecular weight during exposure to selective sintering powder processing temperatures. Further, such polymer composition allows for a significant reduction of thewaste material generated during selective sintering as the unsintered material does not have to be disposed of as waste but may be used again fully, or blended with virgin material of the polymer composition and re-used, in a