US 7,335,693 B2
Antioxidants for polyamides
Hark-Oluf Asbahr, Goennheim (Germany); and Thomas Bomba, Roedersheim-Gronau (Germany)
Assigned to Degussa AG, Duesseldorf (Germany)
Appl. No. 10/483,262
PCT Filed Jul. 11, 2002, PCT No. PCT/EP02/07718
§ 371(c)(1), (2), (4) Date May 24, 2004,
PCT Pub. No. WO03/008492, PCT Pub. Date Jan. 30, 2003.
Claims priority of application No. 101 34 327 (DE), filed on Jul. 14, 2001.
Prior Publication US 2004/0192821 A1, Sep. 30, 2004
Int. Cl. C08K 5/13 (2006.01)
U.S. Cl. 524—324  [524/351] 13 Claims
 
1. A composition comprising a polyamide and 0.01 to 5% by weight of at least one antioxidant based on the total mass of the polyamide, wherein the antioxidant consists of a sterically hindered phenol of formula:

OG Complex Work Unit Drawing
wherein n is from 1 to 5.