Patent ID: 8338554

Claim:
A hyperbranched polymer represented by Formula (1): (where X represents a halogen atom; R 1 represents a hydrogen atom or a methyl group; A 1 represents a structure represented by Formula (2): (where A 2 represents a linear, branched or cyclic alkylene group having 1 to 30 carbon atoms, which may contain an ether bond or an ester bond; each of Y 1 , Y 2 , Y 3 and Y 4 represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a nitro group, a hydroxy group, an amino group, a carboxyl group or a cyano group); and n represents the number of repeating unit structures which is an integer of 5 to 100,000), wherein the weight average molecular weight is 500 to 5,000,000, as measured by a gel permeation chromatography in a converted molecular weight as polystyrene.