Reformed polypropylene resin composition and a method of prepari

Details Reformed polypropylene resin composition and a method of prepari Reformed polypropylene resin composition and a method of prepari

1995-03-14

1997-08-12

Wilson, D. R.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 88, 525193, 525197, 525941, 524505, 524528, C08L 2326, C08L 2330, C08L 2332

Patent

active

056566913

ABSTRACT:
A reformed polypropylene resin composition having high degree of fluidity and excellent impact strength and rigidity, and further having a melt flow rate of from 50 to 150 g/10 min. and establishing a relationship between the melt flow rate (X) and the Izod impact strength (Y) which satisfies a relation Y.gtoreq.-4.7878 log X+13.8829. The reformed polypropylene resin composition is obtained by blending 0.01 to 0.2 parts by weight of an organic peroxide and 0.05 to 1 part by weight of a crosslinking agent per 100 parts by weight of a total of 50 to 90 parts by weight of a polypropylene having a melt flow rate at 230.degree. C. of 10 to 70 g/10 min, 0 to 25 parts by weight of an olefin copolymer rubber, and 5 to 40 parts by weight of an organic filler, and by melt-kneading the mixture by using a biaxial extruder maintaining a temperature of 120.degree. to 200.degree. in the preceding stage of the screw and a temperature of 180.degree. to 270.degree. C. in the succeeding stage, and setting the temperature in the succeeding stage to be higher than the temperature in the preceding stage.

REFERENCES:
patent: Re31518 (1984-02-01), Fischer
patent: 3256366 (1966-06-01), Corbelli
patent: 4088714 (1978-05-01), Huff
patent: 4202801 (1980-05-01), Petersen
patent: 4454092 (1984-06-01), Shimizu et al.
Advances in Polymer Technology, vol. 12, No. 3, 1993 New York US, pp. 263-269, B.K. Kim et al. `cross-linking of polypropylene by peroxide and multifunctional monomer during reactive extrusion`.

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