Multi-component stabilizer system for polyolefins pigmented with

Details Multi-component stabilizer system for polyolefins pigmented with Multi-component stabilizer system for polyolefins pigmented with

1991-02-22

1993-08-31

Morgan, Kriellion S.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524291, C08K 534

Patent

active

052409775

ABSTRACT:
Excellent color stabilization as well as fiber integrity is obtained in bright sunlight at relatively high temperature, in polyolefin (PO) articles pigmented with red, yellow, and orange azo and disazo pigments, by combining the pigment with two `large molecule` primary stabilizers, the first an oxo-piperazinyl-triazine based (PIP-T) hindered amine light stabilizer (HALS), and the second, a 3,5-disubstituted-tert-butyl-4-hydroxybenzoate (3,5-DHBZ). The first contains at least two polysubstituted piperazinone rings in its molecule; the second is a hindered phenol with an ester group in the para- position. Stabilization of the PO's color is obtained for as long as the PO articles themselves are stabilized by the combination of primary stabilizers. With the combination, the pigmented articles are not only thermooxidatively and light-stabilized, but there is exceptionally low color fade. Because fibers may be extruded twice for better distribution of pigment, a small amount, no more than 0.1 phr of secondary melt-stabilizers, may be used. Blue- green- red- orange- and yellow-pigmented PO articles exhibit less than a .+-.3 change in color (color fading) due to degradation of the pigment, over the useful life of the articles, or a period of exposure resulting in absorption of 1240 Kjoules. Such exposure of pigmented articles, deemed equivalent to normal outdoor use over a period of more than 10 years, results in essentially no visible loss of color due to degradation of the pigment.

REFERENCES:
patent: 3901848 (1975-08-01), Dibattista et al.
patent: 4480092 (1984-10-01), Lai et al.
Klemchuck, "Influence of Pigments on Light Stability of Polymers", Polymer Photochemistry, 3, (1983), 1-27.
Wishman, "Stabilization of Polypropylene Fibers", (Phillips Fibers Corporation), Greenville, S.C.

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