Anti-fouling agent and method for producing the same

Details Anti-fouling agent and method for producing the same Anti-fouling agent and method for producing the same

2008-01-18

2008-10-21

Rábago, Roberto (Department: 1796)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S344000, C526S344100, C526S344200, C525S326500, C525S330300, C525S383000

Reexamination Certificate

active

07439311

ABSTRACT:
The present invention provides a method for producing a polymer by conducting polymerization in a polymerization reactor having an inner wall covered with an anti-fouling agent comprising an aqueous solution containing a polyvinyl alcohol obtained through saponification of a polyvinyl ester that contains monomer units having a silyl group. In the present invention, the polyvinyl alcohol satisfies the following formulae (I) and (II):in-line-formulae description="In-line Formulae" end="lead"?370<P×S<9000   (I)in-line-formulae description="In-line Formulae" end="tail"?where P indicates the viscosity-average degree of polymerization of the polyvinyl alcohol, and S indicates the content (mole %) of the monomer units having a silyl group of formula (1) in the polyvinyl alcohol;in-line-formulae description="In-line Formulae" end="lead"?0.2/100≦(A−B)/(B)≦75/100   (II)in-line-formulae description="In-line Formulae" end="tail"?where A indicates the content (ppm) of silicon atoms in the polyvinyl alcohol, and B indicates the content (ppm) of silicon atoms in the polyvinyl alcohol that was washed with sodium hydroxide-containing methanol and then washed with methanol by Soxhlet extraction.

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