Abrasion resistant polymer
AssigneeAlcan International Limited
InventorsRobert Michael Christie, Kenneth Arthur Evans, Jennifer Carolyn Southern, Richard John Cowton
Life of this patent
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Abstract
A polymer formulation of the kind including a polymer such as PVC or thermosetting polyester acrylic or epoxy and generally soft filler materials in an amount of 50-300 parts per 100 of resin, contains 0.05-5% of an abrasion-resistant additive which is silicon carbide or an α-alumina selected from calcined unground alumina having a median crystallite size of at least 5.5 μm, and calcined and ground alumina having a median particle size of at least 3.0 μm, and tabular alumina. Shaped products and coating films formed from such formulations are also included.
Claims13
A formulation comprising as the major component a polymerisable monomer or polymer and optional filler materials, wherein there is present as an abrasion-resistant additive from 0.05-5% by weight on the weight of the non-fugitive content of the formulation of an α-alumina selected from at least one of:
- calcined unground alumina having a median crystallite size of at least 5.5 μm, calcined and ground alumina having a median particle size of at least 3.0 μm, and tabular alumina.
A shaped product comprising as the major component a polymer and optional filler materials, wherein there is present as an abrasion-resistant additive from 0.05-5% by weight on the weight of the product of an α-alumina selected from at least one of:
- calcined unground alumina having a median crystallite size of at least 5.5 μm, calcined and ground alumina having a median particle size of at least 3.0 μm, and tabular alumina.
An article whose surface is coated with a film comprising a polymer and optional filler materials, wherein there is present as an abrasion-resistant additive from 0.05-5% by weight on the weight of the film of an α-alumina selected from at least one of:
- calcined unground alumina having a median crystallite size of at least 5.5 μm, calcined and ground alumina having a median particle size of at least 3.0 μm, and tabular alumina.
Dependencies are inferred from the claim text.