Scale deposit inhibitor, process for its production,...

Details Scale deposit inhibitor, process for its production,... Scale deposit inhibitor, process for its production,...

2005-05-17

2005-05-17

Cheung, William K. (Department: 1713)

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

Synthetic resins

Polymerizing in reactor of specified material, or in reactor...

C422S129000, C525S032000

Reexamination Certificate

active

06894125

ABSTRACT:
A scale adhesion preventing agent for use in a polymerization reactor, consisting essentially of a condensate of a phenol represented by the following formula (1), a 1-naphthol and an aldehyde, which is soluble in an alkaline aqueous solution:wherein R1and R2are the same or different and each a hydroxyl group, alkyl group having 1 to 8 carbon atoms, halogen atom, hydrogen atom, alkoxycarbonyl group whose alkyl moiety has 1 to 8 carbon atoms or phenyl group, with the proviso that a hydrogen atom is existent at at least two of ortho-positions and para-positions with respect to the hydroxyl group.When a vinyl-based monomer is to be polymerized using a polymerization reactor having a film of this scale adhesion preventing agent on the inner wall, the vinyl-based polymer can be produced by preventing the adhesion of a scale.

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