Polypropylene composition

Details Polypropylene composition Polypropylene composition

1987-12-04

1988-09-27

Schofer, Joseph L.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524297, 524314, C08K 506, C08K 512, C08K 511

Patent

active

047742755

ABSTRACT:
Disclosed is a polypropylene composition comprising (a) 100 parts by weight of a propylene copolymer, (b) 0.01 to 0.5 part by weight of a heat stabilizer and (c) 0.1 to 10 parts by weight of a diphenyl ether compound represented by the following general formula: ##STR1## wherein R.sub.1 stands for an unsubstituted phenyl group or a phenyl group substituted with an alkyl group having 1 to 4 carbon atoms, or an alkyl group having 10 to 30 carbon atoms, R.sub.2 stands for an unsubstituted phenoxy group or a phenoxy group substituted with an alkyl group having 1 to 4 carbon atoms, or an alkyl group having 10 to 30 carbon atoms, and m and n stand for an integer of from 0 to 4, with the proviso that the case where each of m and n is 0 is excluded.
In this polypropylene composition, reduction of the physical properties with the lapse of time after irradiation with radiations, especially bend cracking in the direction parallel to the flow direction of the resin, can be prevented, and discoloration by irradiation with radiations can be controlled. Accordingly, the polypropylene composition of the present invention is suitably used for a medical instrument or a packaging material of a food vessel.

REFERENCES:
patent: 3030333 (1962-04-01), Coppinger
patent: 3168493 (1965-02-01), Coppinger
patent: 4525469 (1985-06-01), Ueda et al.
patent: 4582878 (1986-04-01), Chiba et al.

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