Method for prevention of premature polymerization

A method to prevent a premature polymerization of a polymerizable compound with at least one conjugated unsaturated group comprising the steps of:

• (a) providing the polymerizable compound, or providing a reaction mixture with starting components required for the formation of the polymerizable compound,
• (b) adding a salt of at least one of a phenoxazine, phenodiazine, or phenothiazine dye-based compound to said polymerizable compound, and
• (c) adding a sulfonate salt to said polymerizable compound to obtain a mixture,
• wherein said polymerizable compound is selected from the group consisting of acrylic acid, methacrylic acid and esters thereof, and
• wherein said sulfonate salt has the general formula A+RSO3−,
• wherein R is selected from the group consisting of an aliphatic moiety having from 1 to 30 carbon atoms, an aliphatic moiety having from 1 to 30 carbon atoms being substituted by cycloalkyl, aryl, aralkyl, fluoroalkyl, fluoroaryl, fluoroaralkyl, chloroalkyl, chloroaryl, or chloroaralkyl having from 6 to about 12 carbon atoms, heterocyclyl, any aliphatic moiety, alkyl or alkylene fluoroalkyl, fluoroalkylene, chloroalkyl, or chloroalkylene chain being optionally interrupted by one or more hetero atoms, or R is selected from the group of organic groups comprising a hydroxyl substituted aromatic group.