Polymer for rotomoulding
AssigneeBorealis Technology Oy
InventorsAstrid Frohaug, Anders Storen Sandaas, Anne-Marie Fatnes
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Abstract
The invention provides a process for the preparation of a moulded polymer item, said process comprising obtaining a polymer moulding powder having a mean particle size of 1 to 2000 μm comprising an admixture of UV-stabilizer-loaded polymer particles and non-UV-stabilizer-loaded polyolefin polymer particles, loading said powder into a mould, heating and rotating said mould to melt said powder, cooling said mould, and releasing said moulded polymer item from said mould.
Claims17
A process for the preparation of a moulded polymer item, said process comprising obtaining a polymer moulding powder having a mean particle size of 1 to 2000 μm comprising an admixture of UV-stabilizer-loaded polymer particles and non-UV-stabilizer-loaded polyolefin polymer particles, loading said powder into a mould, heating and rotating said mould to melt said powder, cooling said mould, and releasing said moulded polymer item from said mould, wherein said UV-stabilizer loaded and UV-stabilizer unloaded particles are present in a weight ratio of from 0.5:99.5 to 1:10, and said UV-stabiliser loaded polymer particles are formed from homopolymers or copolymers of α-olefins.
A polymer moulding powder for rotational moulding having a mean particle size of 1 to 2000 μm comprising an admixture of UV-stabilizer-loaded polymer particles and non-UV-stabilizer-loaded polyolefin polymer particles wherein said UV-stabilizer loaded and UV-stabiliser unloaded particles are present in a weight of from 0.5:99.5 to 1:10, and said UV-stabiliser loaded polymer particles are formed from homopolymers or copolymers of α-olefins.
A method of preparing a polymer moulding powder for rotational moulding, said method comprising:
- (i) obtaining a plurality of polyolefin polymer particles having a mean particle size of 1 to 2000 μm;
- (ii) obtaining a second polymer formed from a homopolymer or copolymer of α-olefins;
- (iii) intimately mixing said second polymer with a UV-stabilizer to produce a plurality of UV-stabilizer loaded polymer particles;
- and (iv) admixing polymer particles obtained in step (i) with UV-stabilizer-loaded polymer particles obtained in step (iii) so as said UV-stabilizer loaded and UV-stabiliser unloaded particles are present in a weight ratio of from 0.5:99.5 to 1:10.
A process for the preparation of a moulding powder for rotational moulding, said process comprising spraying a heated liquid stabilizer composition onto an agitated heat polymer particulate having a mean particle size in the range 1 to 2000 μm in a mechanically fluidized bed mixer, said polymer particulate comprising an admixture of α-olefin homo or copolymer polymer particles loaded with a UV-stabiliser and polyolefin polymer particles not loaded with a UV-stabilizer wherein said UV-stabilizer loaded and UV-stabiliser unloaded particles are present in a weight ration of from 0.5:99.5 to 1:10.
Dependencies are inferred from the claim text.