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Resinous pigment concentrates comprising at least one pigment and a dispersing additive of a naphthenic extender oil and/or a phosphate ester blended with a major portion of a resinous polymer containing a significant proportion of at least one polymerized conjugated diene monomer, when used for col

Resinous pigment concentrates comprising at least one pigment and a dispersing additive of a naphthenic extender oil and/or a phosphate ester blended with a major portion of a resinous polymer containing a significant proportion of at least one polymerized conjugated diene monomer, when used for coloring resinous polymers as described, are effective in reducing such defects in finished articles as gels and surface blemishes.

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A resinous pigment concentrate comprising a major portion of a resinous polymer containing at least one polymerized conjugated diene monomer in proportions in the range from about 5 to about 40 weight percent, based upon the total resinous polymer; a minor portion of at least one pigment, and a disp

A resinous pigment concentrate comprising a major portion of a resinous polymer containing at least one polymerized conjugated diene monomer in proportions in the range from about 5 to about 40 weight percent, based upon the total resinous polymer; a minor portion of at least one pigment, and a dispersing additive comprising a partial ester of phosphoric acid wherein said partial ester of phosphoric acid is a phosphate ester selected from the group corresponding to the general formula [Figure] wherein R is a residue of an alkyl, alkaryl or aryl compound having at least 6 carbon atoms and a reactive hydrogen, selected from the group consisting of alkylphenols, aliphatic alcohols, fatty acids, fatty acid amides, fatty amines, rosin amines, alkyl sulfonamides, alkaryl sulfonamides, alkyl mercaptans or alkylaryl mercaptans, R′(is hydrogen, an alkyl radical of from 1 to 10 carbon atoms or an aryl radical) R″(is hydrogen, an alkyl radical of from 1 to 10 carbon atoms or an aryl radical) n represents an integer of from 1 to 150, x represents an integer of 1 to 3, y represents an integer of from 0 to 2, and the sum of the integers of x and y is 3.