Propylene polymer composition

Details Propylene polymer composition Propylene polymer composition

1982-03-19

1983-10-25

Griffin, Ronald W.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524451, 524505, 525 88, 525 89, C08F 2316, C08F 5300

Patent

active

044120168

ABSTRACT:
A shaped article having excellent rigidity, resistances to thermal deformation and to mechanical impact at a low temperature, a superior lacquer-bonding property and a satisfactory appearance is made from a propylene polymer composition comprising
(A) 45 to 65% by weight of at least one crystalline ethylene-propylene block copolymer in which the content of the polymerized ethylene is in the range of from 5 to 10% by weight, in which the polypropylene component has a fraction thereof insoluble in boiling n-heptane, in an amount of 95% or more, in which a fraction thereof soluble in p-xylene at room temperature, has an intrinsic viscosity of from 3 to 4 determined in decahydronaphthalene at a temperature of 135.degree. C. and which has a melt flow index of from 5 to 70;
(B) 25 to 40% by weight of at least one amorphous ethylene-propylene copolymer having an intrinsic viscosity of from 2.0 to 3.5 determined in decahydronaphthalene at a temperature of 135.degree. C., and a Mooney viscosity ML.sub.1+4 of from 40 to 100 determined at a temperature of 100.degree. C.;
(C) 4 to 20% by weight of at least one high density polyethylene having a melt flow index of from 1 to 10; and
(D) 3 to 20% by weight of talc in the form of fine particles having an average size of from 0.01 to 5 microns, the weight ratio of the amorphous ethylene-propylene copolymer (B) to the high density polyethylene (C) being in the range of from 10:1 to 5:3.

REFERENCES:
patent: 3478128 (1969-11-01), Hagemeyer et al.
patent: 3647922 (1972-03-01), Leugering et al.
patent: 3751521 (1973-08-01), Roger
patent: 3887640 (1975-06-01), Diaz et al.
patent: 3917746 (1975-11-01), Aishima et al.
patent: 3929932 (1975-12-01), Castagna
Chemical Abstracts, vol. 89, No. 16, Oct. 16, 1978--Abstract 89:130513t.

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