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US 2008/0306186 A1Published application
Low-dust additive & 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.
Claims21
A method for preparing a solid, low-dust pigment composition, said pigment composition comprising
- a) 1 to 99% of one or more organic and/or inorganic pigment,
- b) 1 to 99% of one or more polymer stabilizer selected from primary antioxidants, secondary antioxidants, hindered amine light stabilizers, ultraviolet absorbers and blends of said polymer stabilizers, wherein the selected stabilizer or blend of stabilizers has a melting point of 200° C. or less
- in a weight ratio of a) to b) of from about 19:1 to about 1:19, and
- c) less than 30% by weight of components other than a) and b)
- wherein the pigment is adhered to and in direct contact with the stabilizer,
- which method comprises combining one or more organic and/or inorganic pigment a) with one or more polymer stabilizer or stabilizer blend b) in a ratio of a) to b) of from about 19:1 to about 1:19 and optionally less than 30% by weight of component c) to form a mixture which is subjected to mixing under conditions wherein the stabilizer component is in a liquefied or molten state, optionally in the presence of other inert separable materials,
- wherein said mixing occurs by extrusion of a mixture comprising predominately the pigment and stabilizer, high shear mixing of stabilizer with pigment 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 stabilizer component, or mixing with low shear using additional applied heating,
- followed by cooling of the composition to form a solid.
5 more elements
A solid, low-dust pigment composition, comprising
- a) 1 to 99% of one or more organic and/or inorganic pigment,
- b) 1 to 99% of one or more polymer stabilizer selected from primary antioxidants, secondary antioxidants, hindered amine light stabilizers, ultraviolet absorbers and blends of said polymer stabilizers, wherein the selected stabilizer or blend of stabilizers has a melting point of 200° C. or less
- in a weight ratio of a) to b) of from about 19:1 to about 1:19, and
- c) less than 30% by weight of components other than a) and b)
- wherein the pigment is adhered to and in direct contact with the stabilizer, obtained by a process comprising combining one or more organic and/or inorganic pigment a) with one or more polymer stabilizer or stabilizer blend b) in a ratio of a) to b) of from about 19:1 to about 1:19 and optionally one or more component c) to form a mixture which is subjected to mixing under conditions wherein the stabilizer component is in a liquefied or molten state, optionally in the presence of other inert separable materials,
- wherein said mixing occurs by extrusion of a mixture comprising predominately the pigment and stabilizer, high shear mixing of stabilizer with pigment 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 stabilizer component, or mixing with low shear using additional applied heating,
- followed by cooling of the composition to form a solid.
4 more elements
Dependencies are inferred from the claim text.