CHLOROPRENE POLYMER

Dicbloro-l,3-butadiene [1653-19-6] is a favored comonomer to decrease the regularity and crystallization of chloroprene polymers. It is one of the few monomers that will copolymerize with chloroprene at a satisfactory rate without severe inhibition. It is prepared from by-products or related intermediates. It is also prepared in several steps from chloroprene beginning with hydrochlorination. Subsequent chlorination to 2,3,4-trichloto-1-butene, followed by dehydrochlorination leads to the desired monomer in good yield if polymerization is prevented. 

If flammabiHty is an issue, Hquid chloroprene polymers (eg, Du Pont PB or Denki LCR-H-050) can be used. They cocure and, for that reason, are nonvolatile and nonextractable. They are particularly useful in hard compounds where they do not detract from physical properties as much as nonreactive plastici2ers (132,133). Methacrylate esters have been used as reactive plastici2ers (qv). Por example, hexa(oxypropylene)glycolmonomethacrylate can be used as a reactive plastici2er to enhance flex life without increasing hardness (134). 

The type of chloroprene polymers used is perhaps best illustrated by the variety of special products, designed for adhesive appHcations, that Du Pont has developed. These are described ia Table 8. Standard polymer grades are also often used, especially to modify adhesive properties and to reduce cost. 

This is the preferred designation for all chloroprene polymers and copolymers. Chloroprene rubber was first introduced commercially in 1931 by DuPont and their trade name, originally DuPrene, later Neoprene, has almost become a generic term for all such rubber. See Chlorobutadiene. 

Montaudo, G., Scamporrino, E., Vitalini, D., and Rapisardi, R., Fast Atom Bombardment Mass Spectrometry Analysis of the Partial Ozonolysis Products of Poly(isoprene) and Poly(chloroprene), /. Polym. Sci, Polym. Chem., 30, 525, 1992. 

Chloroprene polymer Chloroprene resin Chloroprene rubber. See... 

Synonyms 1,3-Butadiene, 2-chloro-, polymers 2-Chloro-1,3-butadiene homopolymer Chlorobutadiene polymer 2-Chloro-1,3-butadiene polymer Chloroprene polymer Chloroprene resin Chloroprene rubber CR Neoprene Neoprene rubber Poly (2-chlorobutadiene) Poly (2-chloro-1,3-butadiene) Poly (chloroprene)... 

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