Medical instruments made from a polyolefin composition which has

Details Medical instruments made from a polyolefin composition which has Medical instruments made from a polyolefin composition which has

1984-03-21

1986-02-11

Hoke, Veronica P.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524101, 524102, 524128, 524342, 604187, 422 22, C08K 552

Patent

active

045697361

ABSTRACT:
YMedical instruments, e.g., syringes, which can be sterilized by gamma irradiation and which are made of polyolefin resins (preferably a polypropylene polymer) which are resistant to gamma irradiation. The polyolefin is compounded with a specific hindered amine and a specific phenol or its phosphorous ester, each in an amount of from 0.01 to 1 part by weight per 100 parts of the polyolefin.

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patent: 4401536 (1983-08-01), Lundell et al.
Norman S. Allen "Catalytic Thermal Oxidation of Phenolic Antioxidants by Hindered Piperidine Compounds", Polymer Degradation and Stability 3 (1980-1981), 73-81.
Khirud B. Chakraborty et al., "Mechanisms of Antioxidant Action: The Behavior of Hindered Piperidine Stabilizers During Processing of LDPE", Chemistry & Industry, 237-238 (Apr. 1, 1978).
J. L. Williams et al., "Stability of Gamma Irradiated Polypropylene, Part I, Mechanical Properties", Polymer Preprints, vol. 18, No. 1 (Mar. 1977) 410-413.
T. S. Dunn et al., "Stability of Gamma Irradiated Polypropylene Part II, Electron Spin Resonance Studies", Polymer Preprints, vol. 18, No. 1, (Mar. 1977), 414-419.
J. Reid Shelton, "Stabilization Fundamentals in Thermal Autoxidation of Polymers", Stabilization and Degradation of Polymers-David Allara et al., editors, American Chemical Society, Wash., D.C. 215-225 (1978).

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