Resin composition for capstock
AssigneesKaneka Corporation, Kaneka Texas Corporation
InventorsKazuhisa Tajima, Riichi Nishimura, Takahiko Sugaya
Life of this patent
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Abstract
An acrylic resin composition suitable for the preparation of capstock for siding panels and having excellent impact resistance, weatherability and processability and a low gloss, which comprises 30 to 100% by weight of an impact modifier having a multilayer structure and 0 to 70% by weight of a methyl methacrylate homopolymer or copolymer and whose MFI (melt flow index measured according to ASTM D-1238 at 230° C. and a load of 3.8 kg) is no more than 0.2 g/10 minutes.
Claims11
A resin composition suitable for extrusion to prepare a capstock using a multi-manifold die comprising 80 to 30 parts by weight of an impact modifier having a multilayer structure and 20 to 70 parts by weight of a methyl methacrylate polymer comprising 50 to 100% by weight of methyl methacrylate and 50 to 0% by weight of a copolymerizable monomer, the total of said impact modifier and said methyl methacrylate polymer being 100 parts by weight and said composition having an MFI (melt flow index measured according to ASTM D-1238 at 230° C. and a load of 3.8 kg) of not more than 0.2 g/10 minutes, wherein said methyl methacrylate polymer comprises 5 to 90% by weight of a methyl methacrylate polymer having a molecular weight of not less than 500,000 and 95 to 10% by weight of a methyl methacrylate polymer having a molecular weight of less than 500,000.
A siding panel obtained by extrusion of a capstock and a substrate,
- wherein said capstock is comprised of a resin composition using a multi-manifold die comprising 100 to 30 parts by weight of an impact modifier having a multilayer structure and 0 to 70 parts by weight of a methyl methacrylate polymer comprising 50 to 100% by weight of methyl methacrylate and 50 to 0% by weight of a copolymerizable monomer, the total of said impact modifier and said methyl methacrylate polymer being 100 parts by weight and said composition having an MFI (melt flow index measured according to ASTM D-1238 at 230° C. and a load of 3.8 kg) of not more than 0.2 g/10 minutes, and
- wherein said substrate is vinyl chloride resin.
Dependencies are inferred from the claim text.