Polyamide blends containing a reinforcing agent for laser sintered powder

A process for producing a shaped body by selective laser sintering of a sinter powder (SP), wherein the sinter powder (SP) comprises the following components:

• (A) at least one semicrystalline polyamide comprising at least one unit selected from the group consisting of —NH—(CH2)m—NH— units where m is 4, 5, 6, 7 or 8, —CO—(CH2)n—NH— units where n is 3, 4, 5, 6 or 7, and —CO—(CH2)o—CO— units where o is 2, 3, 4, 5 or 6,
• (B) at least one nylon-6I/6T,
• (C) at least one reinforcing agent,
• wherein
• component (C) is a fibrous reinforcing agent in which the ratio of length of the fibrous reinforcing agent to diameter of the fibrous reinforcing agent is in the range from 2:1 to 40:1.

A process for broadening the sintering window (WSP) of a sinter powder (SP) compared to the sintering window (WA) of component (A), which comprises utilizing a nylon-6I/6T in the sinter powder (SP) comprising the following components:

• (A) at least one semicrystalline polyamide comprising at least one unit selected from the group consisting of —NH—(CH2)m—NH— units where m is 4, 5, 6, 7 or 8, —CO—(CH2)n—NH— units where n is 3, 4, 5, 6 or 7, and —CO—(CH2)o—CO— units where o is 2, 3, 4, 5 or 6,
• (B) at least one nylon-6I/6T,
• (C) at least one reinforcing agent
• for broadening the sintering window (WSP) of the sinter powder (SP) compared to the sintering window (WAC) for a mixture of components (A) and (C), where the sintering window (WSP;
• WAC) in each case is the difference between the onset temperature of melting (TMonset) and the onset temperature of crystallization (TConset).