Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1965-01-11
1982-12-21
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525245, 525323, C08F29708
Patent
active
043650457
ABSTRACT:
1. A process for producing a block polymer which comprises contacting, under polymerizing conditions, propylene with a catalyst comprising a dispersion of solid particles of a metal subhalide wherein said metal is selected from the group consisting of the metals of Groups IVa, Va and VIa of the Periodic Table according to Mendeleeff and an activator therefor selected from the group consisting of metal alkyls, metal hydrides, metal borohydrides, aryl metal halides, and alkyl metal halides wherein said metal is selected from the group consisting of aluminum, zinc, beryllium, chromium, magnesium, lithium, sodium, potassium, and lead, in an inert hydrocarbon liquid reaction medium, whereby said propylene is polymerized to form a polymeric block, then contacting a second monomeric composition selected from the group consisting of ethylene and mixtures thereof with propylene, with said catalyst system under polymerizing conditions whereby said second monomeric composition polymerizes in the presence of the previously formed polymeric block as a linear extension thereto, the polymerization of propylene being performed in the presence of sufficient hydrogen to give a melt index suitable for melt processing of the resulting block polymer and the polymerization of said second monomeric composition being performed in the substantial absence of added hydrogen, terminating the polymerization reaction and separating from the reaction mixture a solid, substantially crystalline block polymer which is predominantly insoluble in said reaction mixture at polymerization temperature and comprises molecules consisting essentially of a single homopolymer block linearly connected to a single polymer block selected from the group consisting of an interpolymer block and a homopolymer block derived from a monomer different from that of the first-mentioned homopolymer block, said block polymer consisting essentially of 99.8 to 40 weight percent of propylene and 0.2 to 60 weight percent of ethylene.
REFERENCES:
patent: 3014018 (1961-12-01), Natta
patent: 3051690 (1962-08-01), Vandenberg
patent: 3067183 (1962-12-01), Hagemeyer
patent: 3529037 (1970-09-01), Hagemeyer
patent: 3798288 (1974-03-01), McManimie
patent: 3970719 (1976-07-01), Edmonds
Hague Louise D.
Jezl James L.
Khelghatian Habet M.
Schneider Abraham
Hensley Stephen L.
Magidson William H.
McClain William T.
Michl Paul R.
Standard Oil Company (Indiana)
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