Controlled-rheology polypropylene

Details Controlled-rheology polypropylene Controlled-rheology polypropylene

1986-05-06

1987-11-17

Schofer, Joseph L.

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

Synthetic resins

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

5253338, C08F 800

Patent

active

047075244

ABSTRACT:
Small amounts of peroxides which do not decompose to TBA and which have a half-life in the range of about 1.0 to 10 hrs. at 128.degree. C. are incorporated in polypropylene by thermal mechanical melting in an extruder. Control of molecular weight and molecular weight distribution is achieved as a function of the amount of peroxide added. The peroxides of choice are 2,2 di(t-amyl) peroxy propane and 3,6,6,9,9 pentamethyl-3 n-propyl-1,2,4,5 tetraoxacyclononane.

REFERENCES:
patent: 3144436 (1964-08-01), Greene et al.
patent: 3887534 (1975-06-01), Baba et al.
patent: 3940379 (1976-02-01), Castagna et al.
patent: 4271279 (1981-06-01), Pastorino et al.
patent: 4451589 (1984-05-01), Morman et al.

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