Pigment concentrates for resins
AssigneePhillips Petroleum Company
InventorDonald G. Needham
Life of this patent
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Abstract
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.
Claims16
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 of 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 consisting essentially of a naphthenic extender oil.
A resinous pigment concentrate prepared by a process comprising the following steps:
- (a) under intensive mixing conditions, blending with a major portion of a resinous copolymer containing at least one polymerized conjugated diene monomer in proportions in the range of from about 5 to about 40 weight percent, based upon the total resinous copolymer, an amount of a naphthenic extender oil as a dispersing additive effective to reduce gel formation or surface blemishes in finished articles made of a polymer which is colored with said resinous pigment concentrate;
- and
- (b) adding at least one pigment to said major portion of resinous polymer and said minor portion of naphthenic oil, as at least about 0.1 weight percent of said resinous pigment concentrate.
A process of preparing colored resinous copolymers containing at least one polymerized conjugated diene monomer in proportions in the range of from about 5 to about 40 weight percent, based upon the total resinous copolymer, which comprises the blending of said resinous copolymer under intensive mixing conditions with a resinous pigment concentrate comprising a major portion of a resinous pigment concentrate comprising a major portion of a resinous copolymer containing at least one polymerized conjugated diene monomer in proportions in the range of from about 5 to about 40 weight percent of said copolymer, a minor portion of at least one pigment, and a dispersing additive consisting essentially of a naphthenic oil.
Dependencies are inferred from the claim text.