Stabilizer combination for the rotomolding process

摘要

A method for the preparation of polyolefin hollow articles comprises the following steps :(1) a hollow mould is filled with a mixture of polyolefin and stabiliser combination comprising at least one organic phosph(on)ite compound (A) and at least one 3-aryl-benzofuranone (B) ; (2) the mould is heated in an oven at a temperature greater than 280 deg.C to melt the stabilised polyolefin ; (3) the mould is rotated about at least two axes to distribute the plastic around the edges ; (4) the mould is cooled whilst still being rotated ; and (5) the mould is opened to remove the hollow article. The use of mixtures of (A) and (B) as high temperature stabilisers for polyolefin rotational moulding or casting materials is also claimed.