Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1984-02-10
1985-07-23
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526125, 5263486, 502104, 502226, C08F 200
Patent
active
045309809
ABSTRACT:
A method of copolymerization in suspension of ethylene with straight-chain alpha-olefins so as to obtain low-density copolymers in two copolymerization steps in an aliphatic hydrocarbon medium having a boiling point above 40.degree. C. In the first reaction step the medium is supplied with a high-activity Ziegler catalyst on a carrier and with ethylene and the alpha-olefin. The copolymerization reaction is carried out for between 20 seconds and 30 minutes and at a temperature between 45.degree. and 65.degree.. The resulting copolymer is used in the second reaction step as a nucleus for polymerizing ethylene and the alpha-olefin, the reaction medium being supplied with additional quantities of ethylene and alpha-olefins so as to maintain the concentration of alpha-olefin in the reaction medium at between 4 and 25% by weight per 100 parts by weight of reaction medium and so as to maintain the pressure of ethylene at between 5 and 25 bars, the reaction being performed at a temperature between 50.degree. and 80.degree. C. for between 1 and 3 hours.
REFERENCES:
patent: 3392213 (1968-07-01), Berger
patent: 3920621 (1975-11-01), Baxmann et al.
patent: 4357448 (1982-11-01), Tsubaki et al.
Enichimica Secondaria S.p.A
Schofer Joseph L.
Societa Italiana Resine S.T.R. S.p.A.
Teskin Fred M.
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