Patent ID: 8153744

Claim:
A hyperbranched polymer represented by Formula (5): where R 1 independently represents a hydrogen atom or a methyl group, A 1 independently represents Formula (2) or Formula (3): 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, and each of X 1 , X 2 , X 3 and X 4 represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a halogen atom, a nitro group, a hydroxy group, an amino group, a carboxyl group or a cyano group, and n is the number of branched repeating unit structures which represents an integer of 2 to 100,000; and a branched repeating unit structure in Formula (5) has a structure of a branched repeating unit represented by Formula (4) in which A 1 represents Formula (2) and a branched repeating unit represented by Formula (4) in which A 1 represents Formula (3) are coupled to each other, with the proviso that R 1 in Formula (4) in which A 1 represents Formula (2) and R 1 in Formula (4) in which A 1 represents Formula (3) may be the same as or different from each other, wherein the hyperbranched polymer has a weight average molecular weight of 500 to 5,000,000, as measured by a gel permeation chromatography in a converted molecular weight as polystyrene.