Stabilized gamma-irradiated polypropylene and sterilizable artic

Details Stabilized gamma-irradiated polypropylene and sterilizable artic Stabilized gamma-irradiated polypropylene and sterilizable artic

1987-05-11

1989-01-10

Morgan, Kriellion

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

Synthetic resins

Processes of preparing a desired or intentional composition...

522 75, C08K 534

Patent

active

047974389

ABSTRACT:
Excellent stabilization of polypropylene (PP) is obtained with a hindered amine containing a polysubstituted piperazin-2-one (PSP) moiety, for example, a C.sub.2 -C.sub.12 alkylene connecting two PSP moieties, or a polyalkylene polyamine having pendant substituted oxo-piperazinyltriazine moieties (PIP-T), that is, having pendant triazine rings substituted with PSP substituents. The stabilizers are particularly effective for PP irradiated with high energy gamma-radiation. Irradiated articles made from PP stabilized with such a hindered amine have improved strength and discoloration resistance, compared to articles made from polymer stabilized with several other hindered amines tested, particularly the 2,2,6,6-tetramethyl-4-piperidyl sebacate.

REFERENCES:
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patent: 4455401 (1984-06-01), Son et al.
patent: 4629752 (1986-12-01), Layer et al.
patent: 4639479 (1987-01-01), Lai et al.
patent: 4675353 (1987-06-01), Son et al.
patent: 4692487 (1987-09-01), Son et al.
Horng et al., "Stabilizers in Gamma-Irradiated Polypropylene", Plastics Engineering, Apr. 1984, pp. 35-37.
Niles et al., "Recent Developments in the Oxidative Degradation of Polypropylene by Gamma Radiation".

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