Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1993-09-16
1997-04-08
Teskin, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
5261246, 526129, 526156, 526348, 5263486, 526901, 526916, C08F 4648, C08F 234, C08F21006
Patent
active
056188951
ABSTRACT:
Copolymers of propylene with other 1-alkenes, obtainable by gas-phase polymerization of a mixture of propylene and another 1-alkene in the absence of a liquid reaction medium under a pressure of from 15 to 30 bar, at from 60.degree. to 90.degree. C. and with an average holdup time of the polymer of from 1 to 5 hours, with the aid of a Ziegler-Natta catalyst system which, besides a titanium-containing solid component, contains an aluminum component and an electron donor, with the temperature being chosen so that, under the preset pressure, no condensation of the monomer mixture takes place in the gas space and, moreover, the ratio of the partial pressures of propylene and the other 1-alkene is adjusted to from 5:1 to 100:1, are particularly suitable for producing sheets and shaped articles.
REFERENCES:
patent: 4260710 (1981-04-01), Staiger et al.
patent: 4351930 (1982-09-01), Patnaik
patent: 4483971 (1984-11-01), Sato et al.
patent: 4721763 (1988-01-01), Bailly et al.
Kerth Juergen
Koelle Peter
Schwager Harald
Zolk Ralf
BASF - Aktiengesellschaft
Teskin Fred
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