LEUCINE-CONTAINING STABILIZING COMPOSITIONS IMPROVING COLOR Russian patent published in 2006 - IPC C08K5/13 C08K5/52 C08K5/17 C08L23/00 

FIELD: chemistry of polymers, chemical technology.

SUBSTANCE: invention relates to leucine-containing stabilizing composition improving color used in treatment of thermoplastic polymers based on polyolefins. The stabilizing composition comprises: (a) at least one sterically hindered phenol; (b) at least one phosphorus-containing secondary antioxidant, and (c) at least leucine or its isomer wherein the mass ratio of components (a):(b):(c) is in the range from 1:5:3 to 2:0.5:0.1, respectively. Also, invention describes a method for improving stability of thermoplastic polymers color based on polyolefins that involves addition to their composition before or after processing the stabilizing composition conferring the stability property in the amount from 0.001 to 5 wt.-% as measured for thermoplastic polymer. Invention describes a method for preparing the stabilizing composition improving color involving mixing components (a), (b) and (c) wherein (a) represents at least one sterically hindered phenol, (b) represents at least one phosphorus-containing secondary antioxidant, and (c) represents at least leucine or its isomer wherein the mass ratio of components (a):(b):(c) is in the range from 1:5:3 to 2:0.5:0.1, respectively. Invention provides conferring the stability property to polyolefin-base thermoplastic polymers resulting to improvement of the color stability of final products.

EFFECT: improved and valuable properties of compositions.

8 cl, 7 tbl, 1 ex