Polymerization inhibition method

Details Polymerization inhibition method Polymerization inhibition method

2011-07-12

2011-07-12

Sullivan, Daniel (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

C562S542000

Reexamination Certificate

active

07977503

ABSTRACT:
The objective of the present invention is to provide a method for inhibiting polymerization of (meth)acrylic acid and the like. By the method, the generation of deposit in a pipe, which is exclusively used for providing a solution of a dialkyldithiocarbamic acid copper salt to a distillation column and the like, is prevented, and the problems such as the clogging of the pipe and polymerization in the distillation column are solved. The method according to the present invention for inhibiting polymerization of (meth)acrylic acid and/or an ester thereof is characterized in comprising a step of inhibiting polymerization of (meth)acrylic acid and/or the ester thereof by using a solution of a dialkyldithiocarbamic acid copper salt dissolved in an organic solvent, wherein a content amount of copper sulfate in the solution of the dialkyldithiocarbamic acid copper salt is 100 ppm or less by mass.

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International Search Report dated Aug. 12, 2008 issued in connection with International (PCT) Application No. PCT/JP2008/060295.

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