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US 12,448,520 B2Granted
Process for colouring a thermoplastic polymer
AssigneeRohm Co., Ltd.
InventorsUrsula Golchert, Ralf Richter, Jörg Kraft, Gerald Dietrich, Ernst Becker, Stefan Nau
Life of this patent
Estimating the term…
Abstract
A process can be used for manufacturing a coloured moulding composition with an improved optical appearance and a particularly high thermal stability. The process involves providing a thermoplastic polymer and adding a colouring preparation, or a liquid composition or a master batch containing the colouring preparation. Injection moulded parts and extruded parts can be composed of the coloured moulding composition.
Claims20
A process for manufacturing a coloured moulding composition, the process comprising:
- a) providing a thermoplastic polymer;
- and
- b) adding to the thermoplastic polymer from a), a colouring preparation or a liquid composition or a masterbatch comprising said colouring preparation,
- wherein the colouring preparation comprises a monoazo dye comprising at least one heteroaromatic moiety;
- and
- wherein the colouring preparation comprises
- less than 100 ppm of aluminium or a compound thereof, and
- less than 300 ppm of silicon or a compound thereof;
- and
- wherein the colouring preparation has mass loss in dried form of 0.0 to 5.0 wt. % in isothermal thermogravimetric analysis at 260° C. for 15 min.
7 more elements
Dependencies are inferred from the claim text.