Polyolefin compositions and articles sterilizable by irradiation

Details Polyolefin compositions and articles sterilizable by irradiation Polyolefin compositions and articles sterilizable by irradiation

1982-09-28

1986-01-07

Hoke, Veronica P.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524102, 524104, 522 75, C08F 800, C08K 534

Patent

active

045632596

ABSTRACT:
Polyolefin compositions and articles, especially articles of medical ware, such as polypropylene hypodermic syringes, are made more resistant to the embrittlement which accompanies sterilization by high energy (e.g. gamma) irradiation by the addition to a polyolefin of narrow molecular weight distribution of a heterocyclic hindered amine and, optionally, a liquid modifier.

REFERENCES:
patent: 4274932 (1981-06-01), Williams et al.
"The Effects of Sterilising, Processes on Plastics", Bio-Medical Engineering, Sep. 1970, 443-447.
"Radiation Stability of Polypropylene", Radiat. Phys. Chem., 1977, vol. 9, pp. 445-454.
"Instrumentation for High Temperature Analytical GPC", Proceedings of a meeting held at the National Physical Laboratory, Tedidngton, Mar. 1972.
Raff, R. A. V. et al., Crystalline Olefin Polymers--Part II, 338-343 (1964) Interscience Pub. N.Y.
Davis, Thomas E. et al., "Thermal Degradation of Polypropylene" J. Polymer Science, vol. 56, 485-499 (1962).
Nunes, Ronald W. et al., "Influence of Molecular Weight and Molecular Weight Distribution on Mechanical Properties of Polymers"--Polymer Engineering and Science, Mar. 1982, vol. 22, No. 4, 205-228.

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