Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1981-09-11
1983-01-11
Schofer, J. L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526200, 526201, 5263442, C08F 200
Patent
active
043683070
ABSTRACT:
In a process for preparing a vinyl chloride resin by polymerizing vinyl chloride alone or with up to 20% by weight of other polymerizable unsaturated monomers, in an aqueous suspension, in the presence of a monomer-soluble free radical catalyst and a suspension stabilizer which is partially hydrolyzed polyvinyl acetate or cellulose ether, there is an improvement wherein the polymerization is conducted in the presence of 0.02-0.3% by weight, based on the amount of monomer to be polymerized, of a cosuspension stabilizer which is a copolymer of 2-n-propyl-.DELTA..sup.2 -oxazoline, 2-isopropyl-.DELTA..sup.2 -oxazoline or both and 2-methyl-.DELTA..sup.2 oxazoline, 2-ethyl-.DELTA..sup.2 -oxazoline or both, the copolymer having a viscosity number of 35-70 (ml/g), measured at 25.degree. C. in an isopropanol/water mixture (50 vol-% of isopropanol), in a concentration of 0.5% (weight/volume of the solution).
REFERENCES:
patent: 3597343 (1971-08-01), Delzenne et al.
patent: 3817963 (1974-06-01), Baline et al.
"Chemical Reviews", 1971, vol. 71, No. 5, Frump, p. 496.
Sielfeld Gilbert
Sunder-Plassmann Paul
Chemische Werke Huls AG
Lipman Bernard
Schofer J. L.
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