Polyoxyalkylene monoalkyl ether, process for producing the same, polymerizable polyoxyalkylene monoalky ether derivative, polymer of said derivative and dispersant comprising said polymer

A polymerizable polyoxyalkylene monoalkyl ether derivative prepared by using a polyoxyalkylene monoalkyl ether represented by formula [1] as a raw material:

• R1O(AO)nH [1]
• wherein R1 represents a hydrocarbon group having 1 to 18 carbon atoms, AO represents an oxyalkene group having 2 to 4 carbon atoms, n represents an average number of addition of the oxyalkylene group which is 5 to 500, a plurality of AO may represent the same type of oxyalkylene group or different types of oxyalkylene groups and, when the plurality of AO represents different types of oxyalkylene groups, the different types of oxyalkylene groups may be arranged randomly or in blocks,
• wherein a chromatogram of the polyoxyalkylene monoalkyl ether obtained in accordance with gel permeation chromatography which exhibits a relation between an intensity of a refractive index obtained by a differential refractometer and an elution time satisfies a relation expressed by equation (A):
• S1/S0≦0.15 (A)
• wherein S1 represents an area under a portion of the chromatogram from start of elution to an earliest elution time when the intensity of a refractive index has a value of L/3, L representing a shortest distance between a greatest maximum point of the intensity of a refractive index and a base line, and S0 represents an area under a portion of the chromatogram from start of elution to an elution time when the intensity of a refractive index has the greatest maximum value, wherein said polymerizable polyoxyalkylene monoalkyl ether derivative is represented by formula [2]:
• R1O(AO)nR2 [2]
• wherein R1, AO and n are as defined above and R2 represents an unsaturated hydrocarbon group having 3 to 4 carbon atoms.