Polymerization process with subsequent peptization

Details Polymerization process with subsequent peptization Polymerization process with subsequent peptization

1976-12-14

1978-11-07

Henderson, Jr., Christopher A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 30, 526295, C08F 224, C08F 3618

Patent

active

041247540

ABSTRACT:
A process for making sulfur-modified neoprenes, wherein chloroprene, which may be mixed with up to 20 weight percent of another unsatuated, organic monomer, is polymerized in an aqueous, alkaline emulsion in the presence of about 0.25-0.45 part of sulfur per 100 parts of total organic monomer to a conversion of at most 74%; peptization is initiated by adding to the resulting latex 0.3-1.5 parts of tetraethylthiuram disulfide or another tetraalkylthiuram disulfide, then adding sodium dibutyldithiocarbamate or another water-soluble dialkyldithiocarbamate in a ratio to tetraethylthiuram disulfide of at least 0.8:1; and peptization is contained until it is about 85-95% complete. The polymer then is isolated. Neoprenes made by this process have, when vulcanized, outstanding heat and flex resistance and superior tensile properties, tear strength, and compression set.

REFERENCES:
patent: 3318832 (1967-05-01), Sparks
patent: 3397173 (1968-08-01), Collette
patent: 3595847 (1971-07-01), Mayer-Mader

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