Propylene compositions with improved resistance to thermoforming

Details Propylene compositions with improved resistance to thermoforming Propylene compositions with improved resistance to thermoforming

1992-05-11

1995-08-08

Chapman, Mark A.

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

Synthetic resins

Compositions to be polymerized by wave energy wherein said...

522 76, 522 78, 522 79, 522161, 525240, C08J 328

Patent

active

054399491

ABSTRACT:
Polymer compositions having improved resistance to thermoforming sag are disclosed. The compositions comprise a first and second portion selected from the group comprising polypropylene, propylene-ethylene copolymers and mixtures thereof wherein a first portion of the composition is (1) mixed with from about 500 to about 3000 ppm of antioxidant; and (2) irradiated with a dosage of from about 10 to about 20 Mrads gamma or electron beam of ionizing radiation in air, and the second portion of said polymer composition is non-irradiated. The first portion is present in an amount effective, from about 1.0% to about 10.0%, to increase the elasticity of the polymer composition in the molten state by at least 10% as compared to the second portion of said polymer composition.

REFERENCES:
patent: 3349018 (1967-10-01), Potts
patent: 4282076 (1981-08-01), Boynton
patent: 4507415 (1985-03-01), Kasai
patent: 4598128 (1986-07-01), Randall
patent: 4628073 (1986-12-01), Fisher
patent: 4727113 (1988-02-01), Kohyama
patent: 4888369 (1989-12-01), Moore
patent: 4916198 (1990-04-01), Scheve
Translation of German DE 3,415,063 (Kirch).
Cross-Linking with Radiation, Encyclopedia of Polymer Science, vol. 4, pp. 418-449.
Radiation-Resistant Polymers, Encyclopedia of Polymer Science, vol. 14, pp. 667-708.

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