Phenolfree stabilization of polyolefins

Details Phenolfree stabilization of polyolefins Phenolfree stabilization of polyolefins

2006-09-12

2006-09-12

Szekely, Peter (Department: 1714)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C524S100000, C524S111000, C524S121000, C524S154000, C252S400240, C252S405000, C252S407000

Reexamination Certificate

active

07105590

ABSTRACT:
The instant invention relates to stabilizer compositions for thermoplastic polymers comprising a) at least one organophosphine, b) at least one 2-phenylbenzofuranone, and c) at least one sterically hindered piperidine based stabilizer (HAS), wherein the weight ratio of component a) to component b) to component c) is from 1:0.05:0.5 to 1:3:5. The instant compositions need an overall lower concentration as compared with the conventional phenol-containing formulations. In polyolefin articles, particularly in polyolefin-fibers, discoloration during processing and service life by both the formation of quinoid products and by action of NOx gases (gasfading) is avoided.

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Klemchuk et al., “Transformation Products of Hindered Phenolic Antioxidants and Colour Development in Polyolefins,” Polymer Degradation and Stability, vol. 34 Nos. 1-3, pp. 333-346 (1991).
Gachter et al., “Plastics Additives Handbook,” 3rdEd., pp. 1-105 (1990).

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