Process for making polyamide/polyolefin blends having superior i

Details Process for making polyamide/polyolefin blends having superior i Process for making polyamide/polyolefin blends having superior i

1991-11-08

1993-08-10

Buttner, David J.

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

Synthetic resins

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

525179, 525181, 525182, 525183, C08L 7700, C08L 5104, C08L 2312

Patent

active

052349934

ABSTRACT:
A process for melt-blending a polyamide with a crystalline polyolefin incompatible therewith in the presence of a rubbery compatibilizing polymer capable of chemically or physically associating with both the polyamide and the polyolefin, at a process temperature higher than the highest melting temperature of any crystalline polymer present and higher than the highest glass transition temperature of any amorphous polymer present but such that significant degradation of any polymer present does not occur, all blend components being present within stated ranges, and the melt viscosity ratio of the polyamide to that of the polyolefin at the process temperature and a shear rate of about 100-200 sec.sup.-1 being about 0.1-1.2, especially 0.4-0.8. High stiffness, supertough polymer blends, where notched Izod impact strength exceeds 535 J/m, are obtained.

REFERENCES:
patent: 4174358 (1979-11-01), Epstein
patent: 4780505 (1988-10-01), Mashita et al.
patent: 4988764 (1991-01-01), Nishio
patent: 5006601 (1991-04-01), Lutz
Paper by Modic et al. in "Plastics Engineering" Jul. 1991 pp. 37-39.

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