Also, it has been found that polymer particles made using a supported catalyst manufactured using a mechanically fluidised bed, a product particularly suitable for rotomoulding may be produced.Thus, the invention provides a process for the preparation of a polymer moulding powder comprising (i) impregnating a mechanically fluidized porous particulate support material with a catalyst and polymerizing a monomer or monomer mixture in the presence of the catalyst-impregnated support material to give olefin polymer particles; and then either (ii) heating a mixture of: A) at least one phenolic antioxidant; B) at least one organic phosphite or phosphonite antioxidant; C) at least one UV-stabiliser; D) a diluent; and optionally E) a metal stearate; to a temperature of between 20 and 200 °C; (iii) depositing the mixture onto said polyolefin polymer particles; and optionally (iv) blending a metal stearate to the resulting polyolefin polymer particle if component E was not present in said mixture; or (iia) obtaining a second polymer; (iiia) intimately mixing said second polymer with a UV-stabilizer to produce a plurality of UV-stabilizer loaded polymer particles, e.g.
Cyasorb UV 3346) or [Poly ( (6- ( (1, 1, 3, 3- tetramethylbutyl) amino) -1,3, 5-triazine-2 , 4- diyl) (2,2,6,6-tetramet yl-4-piperidyl) imino) -1,6- hexanediyl ( (2,2,6, 6-tetramethyl- -piperidyl) imino) ) ] (e.g. A process as claimed in claim 5 wherein said UV stabiliser is [1, 6-Hexanediamine, N, N' -bis (2 , 2, 6 , 6- tetramethyl-4-piperidinyl) - , polymer with 2,4,6- trichloro-1 , 3 , 5-triazine, reaction products with, N- butyl-1-butanamine and N-butyl-2 , 2 , 6 , 6-tetramethyl-4- piperidinamine] .8.
A process as claimed in any one of claims 1 to 7 wherein said at least one organic phosphite or phosphonite antioxidant is [Bis (2-methyl-4 , 6-bis (1, 1- dimethylethyl) phenyl) phosphorous acid ethylester].10.
It has been found that the polymer may be stabilised by a particular blend of additives or by the addition of a masterbatch of UV-stabiliser...
It has been found that the polymer may be stabilised by a particular blend of additives or by the addition of a masterbatch of UV-stabiliser loaded polymer particles.
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