Monomer composition containing an unsaturated polyalkylene glycol ether monomer, the method for producing the composition, production method of polymers and polymer obtained by using the composition

The present invention provides a monomer composition containing an unsaturated polyalkylene glycol ether-based monomer is excellent in stability. A following chemical formula (1): In the formula, Y represents an alkenyl group having 2 to 7 carbon atoms, R n represents an average addition mole number of the oxyalkylene group, the number of 5 to 500, R Unsaturated polyalkylene glycol ether-based monomer represented by in an organic acid, wherein the water, the, pH is 4 to 13, is achieved by the monomer composition. .BACKGROUND