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US 6,689,840 B1Granted
Weathering resistance of polymeric materials
AssigneeLucite International UK Limited
InventorsPaul Eustace, Neil Andrew McCathy, Nicholas John Marston
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Abstract
A polymeric material containing a halogen-containing polymer such as PVC, an inorganic hydroxide and, an acrylic material is described. The presence of the inorganic hydroxide provides a material of superior weathering resistance as compared to materials comprising halogen-containing polymers which do not contain hydroxide.
Claims36
A polymeric material comprising:
- (a) an acrylic polymer selected from the group consisting of a homopolymer of an alkyl (alk)acrylate, a copolymer made by polymerising a monomer mixture comprising 50 to 99% by wt of an alkyl methacrylate and 1 to 50% by wt of an alkyl acrylate, or a copolymer including at least 15% by weight of acrylonitrile;
- (b) a halogen containing polymer which contains between 5 to 70% by wt of halogen;
- (c) 0.1 to 25% by wt of an inorganic hydroxide selected from magnesium hydroxide, antimony hydroxide and zinc hydroxide or mixtures thereof.
A polymeric material comprising:
- (a) an acrylic polymer present in an amount of 0.1 to 99.8% by wt based on the total weight of the polymeric material, wherein the acrylic polymer is selected from the group consisting of a homopolymer of a C1-C6 alkyl (C0-C10 alk)acrylate, or a copolymer made by polymerising a monomer mixture comprising 50 to 99% by weight of an alkyl methacrylate and 1 to 50% by weight of an alkyl acrylate;
- (b) a halogen containing polymer present in an amount of 0.1 to 99.8% by wt based on the total weight of the polymeric material, wherein the halogen containing polymer contains between 5 to 70% by wt of halogen;
- and
- (c) an inorganic hydroxide present in an amount of 0.1 to 25% by wt based on the total weight of the polymeric material, wherein the inorganic hydroxide comprises magnesium hydroxide.
1 more element
Dependencies are inferred from the claim text.