Process for producing a polymer using a quinone compound condensation product polymer scale preventive agent
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsToshihide Shimizu, Mikio Watanabe
Life of this patent
Estimating the term…
Abstract
A polymer scale preventive agent for use in polymerization of a monomer having an ethylenically unsaturated double bond, comprising an alkaline solution containing (A) a condensation product having a molecular weight of 400 to 50,000 obtained by condensing a quinone compound. This agent is applied to the inner wall surfaces of a polymerization vessel, and dried to form a coating. Such a vessel is effective in preventing polymer scale deposition, not only on the areas located in the liquid-phase region but also on the areas around the interface between the gas and liquid phases in the vessel, and is useful in producing a polymer that shows few fish eyes and good whiteness when formed into sheets or the like.
Claims14
A process for producing a polymer of a monomer having an ethylenically unsaturated double bond, which comprises polymerizing the monomer in a polymerization vessel having a coating on its inner wall surfaces, whereby polymer scale is prevented from being deposited,
- wherein said coating has been formed by applying an alkaline solution containing:
- (A) a condensation product having a molecular weight of 400 to 50,000 obtained by condensing a quinone compound, and drying said applied solution, wherein said quinone compound is a quinone compound selected from the group consisting of:
- the compounds having the following general formula (1):
- ##STR9## wherein (R.sup.1)s may be the same or different and are each --H, --NH.sub.2, --Cl, --Br, --OH, --NO.sub.2, --COCH.sub.3, --OCH.sub.3, --N(CH.sub.3).sub.2, --COOH, --SO.sub.3 H or an alkyl group having 1 to 3 carbon atoms;
- and
- the compounds having the following general formula (3):
- ##STR10## wherein (R.sup.1)s may be same or different and are each as defined above, and (R.sup.2)s may be the same or different and are each --H, --Cl, --Br, --OH, --COCH.sub.3, --OCH.sub.3, --CH.sub.3, --COOH OR --SO.sub.3 H.
Dependencies are inferred from the claim text.