Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1997-11-06
1999-03-09
Lipman, Bernard
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526218, 52631825, C08F 438
Patent
active
058802339
ABSTRACT:
Copolymers of ethylene with .alpha.,.beta.-unsaturated carboxylic acids are prepared at from 50.degree. to 250.degree. C. and from 500 to 5000 bar in a stirred autoclave having a length/diameter ratio greater than 5:1 by a process in which the monomer mixtures are fed into the autoclave in at least two part-streams, the first part-stream being passed into the autoclave at the beginning of the autoclave pipe and the second part-stream being introduced at a position which is a distance away from the beginning which corresponds to 25-50% of the total length and the amount of the .alpha.,.beta.-unsaturated carboxylic acids in the first part-stream is from 20 to 90% less than the average amount in the further part-streams and a peroxide polymerization initiator having a lower decomposition temperature, or a mixture of peroxide polymerization initiators having a lower average decomposition temperature, than that of the initiators in the further part-streams is passed in with the first part-stream.
REFERENCES:
patent: 3865881 (1975-02-01), McMullen
patent: 4351931 (1982-09-01), Armitage
patent: 4698450 (1987-10-01), Nuttens et al.
Patent Abst. of Japan, vol. 13, No. 408, C-634, Sep. 8, 1989 (English abstract of JP 1 149828A).
Deckers Andreas
Klimesch Roger
Schauss Eckard
Weber Wilhelm
BASF - Aktiengesellschaft
Lipman Bernard
Sarafim N.
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