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US 2001/0044518 A1Published application
Dust-free, epoxy-containing stabilizer granules and the preparation process
OwnerKurt Hoffmann, Heinz Herbst +1inventors
InventorsKurt Hoffmann, Heinz Herbst, Rudolf Pfaendner
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Abstract
The invention relates to low-dust granules of plastics additives, comprising a) a phenolic antioxidant, an organic phosphite or phosphonite, a phosphonate, a sterically hindered amine or a UV absorber, individually, or a mixture of these compounds, and b) at least one epoxy compound which is solid at room temperature. The granules are particularly suitable for stabilizing polymers, especially polyolefins such as polypropylene or polyethylene.
Claims20
Low-dust granules of plastics additives, comprising
- a) a phenolic antioxidant, an organic phosphite or phosphonite, a phosphonate, a sterically hindered amine or a UV absorber, individually, or a mixture of these compounds, and
- b) at least one epoxy compound which is solid at room temperature.
A process for preparing plastics additive granules, which comprises heating
- a) a phenolic antioxidant, an organic phosphite or phosphonite, a phosphonate, a sterically hindered amine or a UV absorber, individually, or a mixture of these compounds, and
- b) at least one polyfunctional epoxy compound which is solid at room temperature to an extent such that at least 80% by weight of the epoxy compound has melted, pressing the melt through a plate provided with dies or perforations, the die or perforation diameter being between 1 and 10 mm, and chopping the resulting strands in the plastic state to form granules.
Dependencies are inferred from the claim text.