there is disclosed a graph copolymer derived from a monomer mixture comprising a . a monomer having the formula ## equ1 ## wherein r 2 is a substituted or unsubstituted hydrocarbon group and b . an unsaturated ethylenic monomer having the formula ## equ2 ## p wherein x is an ester , aldehyde , ketone , halogen , ether , nitrile , isocyanate , sulfate and its salts , an n - containing heterocycle , or an aromatic hydrocarbon , graft polymerized on a poly substrate , a stable aqueous emulsion containing same and a method of production therefor .