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US 7,789,957 B2Granted
Low-dust additive and pigment blends with improved color
AssigneeCiba Corporation
InventorsJohn Adams, Roger Reinicker, Damien Thurber Cole, Gerard Finnegan
Life of this patent
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Abstract
Solid, low dust pigment compositions are formed i by mixing pigments with certain polymer stabilizers under conditions wherein the stabilizers are in a liquefied state. The pigment compositions are easily handled and have a high color yield when incorporated into polymer substrates. In many cases, the color development attained is not readily achievable using pigment compositions comprising conventional carriers.
Claims8
A method for preparing a solid, low-dust pigment composition, said pigment composition consisting of
- a) one or more organic and/or inorganic pigment,
- b) one or more hindered phenol or dialkyl hydroxylamine having a melting point of 200° C. or less in a weight ratio of a) to b) of from about 10:1 to about 1:10, and
- c) from 0 to 5% by weight, based on the total weight of the pigment composition, of components other than a) and b)
- wherein the pigment is adhered to and in direct contact with the hindered phenol or dialkyl hydroxylamine,
- which method comprises combining one or more organic and/or inorganic pigment a) with one or more hindered phenol or dialkyl hydroxylamine b) in a ratio of a) to b) of from about 10:1 to about 1:10 and 0 to 5% by weight based on the combined weight of a), b) and c) of component c) to form a mixture which is subjected to high shear mixing with little external heating or no external heating wherein the heat generated by the mixing at high shear is enough to create liquefaction of the hindered phenol or dialkyl hydroxylamine
- followed by cooling to form the solid low dust pigment composition.
3 more elements
Dependencies are inferred from the claim text.