Stabilized gamma-irradiatable polypropylene fibers and steriliza

Details Stabilized gamma-irradiatable polypropylene fibers and steriliza Stabilized gamma-irradiatable polypropylene fibers and steriliza

1989-02-22

1992-06-16

Morgan, Kriellion S.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

422 22, 522 75, C08K 53477, A61L 200

Patent

active

051225930

ABSTRACT:
Excellent stabilization of polypropylene (PP) fibers exposed to sterilization levels of gamma radiation, is obtained with a hybrid stabilizer having a N-(substituted)-1-(piperazin-2-one alkyl) group at one end and a (3,5-dialkyl-4-hydroxyphenyl)-.alpha.,.alpha.-disubstituted acetamide at the other. When this hybrid of a hindered amine with a hindered phenol is combined through a disubstituted alpha carbon atom of the acetamide in a single molecule, it affords the advantages of each group with respect to its stabilization against oxidation, but without the known inherent disadvantages of either group. This molecule is N-(substituted)-1-(piperazin-2-one alkyl)-.alpha.-(3,5-dialkyl-4-hydroxyphenyl)-.alpha.,.alpha.-substituted acetamide molecule ("3,5-DHPZNA" for brevity). When the hybrid stabilizer is incorporated into PP fibers which are exposed to gamma irradiation, the PP fibers exhibit only a barely noticeable discoloration, yet are inculcated with a unique property: though exposed to 4 Mrad of gamma radiation, the PP fibers suffer essentially no loss of their original, pre-irradiated tensile strength after about seven months at 60.degree. C. in an oven. This property is atypical of PP fibers stabilized with several other hindered phenols and hindered amines tested. The unexpected retention of tensile strength in 3,5-DHPZNA stabilized PP fibers used in articles exposed to a sterilizing dosage level of gamma radiation, is of great practical value. Particularly in such articles as clothing and household goods made from woven or non-woven fabrics of dyed or pigmented PP fibers, in which goods slight discoloration is acceptable, this invention is of commercial importance.

REFERENCES:
patent: 4780495 (1988-10-01), Lai et al.
patent: 4797438 (1989-01-01), Kletecka et al.
"Stabilizers in Gamma-Irradiated Polypropylene", by Horng, P. and Klemchuk, P., Plastics Engineering, Apr. 1984, pp. 35-37.
"Recent Developments in the Oxidative Degradation of Polypropylene by Gamma Radiation", by Wiles, D. M. and Carlsson, D. J.

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