Patent · US Expired

Polymer powder with phosphonate-based flame retardant, process for its production, and moldings produced from this polymer powder

US7317044B2 · kind B2 · utility

19Cited by

26References

16Claims

0Family size

Assignee

Degussa AG · DE

Inventors

Sylvia Monsheimer · Haltern am See, DE
Maik Grebe · Bochum, DE
Franz-Erich Baumann · Schneverdingen, DE

Key dates

Filing date	Jul 16, 2004
Grant date	Jan 8, 2008
Priority date	—
Expiry date	Sep 17, 2025

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08K5/5317
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The present invention relates to a polymer powder composed of polyamide or of copolyamides, which also comprises flame retardant, in particular phosphonates, to a layer-by-layer process which selectively melts regions or selectively binds them, and also to moldings produced from this polymer powder. Compared with conventional products, the moldings constructed using the powder of the invention exhibit marked advantages in flammability and combustibility and drop behavior, particularly with respect to UL® (Underwriters Laboratories) classification. Furthermore, moldings produced from polymer powder of the invention have adequately good mechanical properties when compared with moldings based on polymer powders without flame retardant, in particular in terms of modulus of elasticity and tensile strain at break. In addition, these moldings also have a density close to that of injection moldings.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.