Process for the production of polar-modified polypropylene and i

Details Process for the production of polar-modified polypropylene and i Process for the production of polar-modified polypropylene and i

1981-05-26

1983-01-25

Levin, Stanford M.

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

Synthetic resins

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

524547, 524556, 524562, 525242, 525285, 525286, 525288, 525296, 525297, 525301, 525309, C08F25502

Patent

active

043704506

ABSTRACT:
A process for the production of modified polypropylene particles by polymerizing vinyl monomers in aqueous suspension wherein (a) an aqueous suspension is prepared which, based on 100 to 2000 parts by weight of water, contains 100 parts by weight of polypropylene particles, 4 to 30 parts by weight of a polar vinyl monomer and based on 100 parts by weight of the monomer, 0.1 to 10 parts by weight of a radical chain polymerization initiator which has a half life of at least 2 h at a temperature of 80.degree. to 135.degree. C. and 10 to 1200 parts by weight of an organic solvent which is capable of swelling polypropylene, of which the boiling point at 760 Torr is at least 100.degree. C. and which is miscible with the monomers in any proportion; (b) the aqueous suspension is heated without decomposition of the initiator, the polypropylene being swollen and the monomer penetrating into the polypropylene, after which (c) the aqueous suspension is kept at temperatures of .gtoreq.85.degree. C. until polymerization of the monomer has ceased. The modified polypropylene is used to improve the mechanical properties of unmodified, optionally glass-fibre-reinforced polypropylene.

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patent: 4078017 (1978-03-01), Nagatoshi et al.
patent: 4080405 (1978-03-01), Agouri et al.
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