Stabilizer combination for the rotomolding process
AssigneeCiba Specialty Chemicals Corporation
InventorUrs Leo Stadler
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Abstract
A process for the production of polyolefin hollow articles comprises charging the polyolefin with a stabilizer combination comprising (a) at least one compound from the group of the organic phosphites or phosphonites, (b) one or more compounds selected from the group consisting of i.) hydroxylamine derivatives and ii.) amine oxide derivatives and (c) at least one compound from the group of the hindered amine stabilizers, filling this mixture into a mold, heating this mold in an oven to above 280° C., such that the stabilized polyolefin fuses, rotating the mold around at least 2 axes, the plastic spreading to the walls, and cooling the mold while still rotating, opening it and taking the resultant hollow article out.
Claims10
A process for the production of polyolefin hollow articles, which comprises
- charging the polyolefin with a stabilizer combination, comprising
- (a) at least one compound from the group of the organic phosphites and phosphonites,
- (b) one or more compounds selected from the group consisting of hydroxylamine derivatives and
- (c) at least one compound from the group of the hindered amine stabilizers,
- filling this mixture into a mold, heating this mold in an oven to above 280° C., such that the stabilized polyolefin fuses,
- rotating the mold around at least 2 axes, the plastic material spreading to the walls,
- cooling the mold while still rotating,
- opening it, and
- taking the resultant hollow article out.
Dependencies are inferred from the claim text.