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US 4,054,547 AGranted
Polymerization of chloroprene
AssigneeToyo Soda Manufacturing Co., Ltd.
InventorsAkihiko Shimizu, Takao Hayashi
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Abstract
A latex of chloroprene polymer is produced without using an emulsifier, which comprises polymerizing chloroprene by free radical polymerization, in an aqueous medium in the presence of 0.2 - 10 wt.% of styrene sulfonic acid or a derivative thereof, based on the total monomers added to the system. In a preferred embodiment the quantity of chloroprene added is 0.5 to 50% wt.
Claims5
A process for producing a latex of chloroprene polymer, which comprises:
- polymerizing the chloroprene or a mixture of chloroprene and a comonomer by free radical polymerization in an aqueous medium in the presence of 0.2 - 10 weight percent based on the total monomers of a styrene sulfonic acid compound having the formula:
- ##STR2## wherein R represents hydrogen or lower alkyl;
- X represents hydrogen, halogen, hydroxyl or lower alkyl;
- and Y represents hydrogen, an alkali metal or quaternary ammonium ion such that either (1) from 0.5 - 50 weight percent of the total amount of chloroprene or a mixture of chloroprene and a comonomer are polymerized in 10 - presence of said styrene sulfonic acid compound or (2) a portion of said chloroprene and styrene sulfonic acid compound is copolymerized to achieve a conversion of 10-70%, and after either (1) or (2) is completed, the residual chloroprene or monomer mixture is added to continue polymerization.
1 more element
Dependencies are inferred from the claim text.