Pvc/wood composite

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 97/02 (2006.01) B32B 23/02 (2006.01) C08L 27/06 (2006.01) C08L 27/24 (2006.01) C08L 31/04 (2006.01) C08L 33/12 (2006.01)

Patent

CA 2626992

The present invention relates to a thermoplastic/natural cellulosic fiber composite, and more specifically to a high molecular weight compatibilizer within that composite resulting in both a high flex strength and high modulus and significant reduction in water absorption. The compatibilizer is preferably a terpolymer comprising: a) 0.5-20 percent by weight of monomer units selected from the group consisting of maleic anhydride, substituted maleic anhydride, mono-ester of maleic anhydride, itaconic anhydride, maleic acid, fumaric acid, crotonic acid, acrylic acid and methacrylic acid; b) 0 to 40 percent by weight of monomer units selected from styrene and functionalized styrene; and c) 40 to 98.5 percent by weight of monomer units selected from the group consisting of C1-8 alkyl acrylates and methacrylates, and vinyl acetate.

La présente invention concerne un composite fibres cellulosiques naturelles/thermoplastiques, et notamment un agent de compatibilité de poids moléculaire élevé au sein de ce composite permettant d'obtenir à la fois une résistance en flexion élevée et un module élevé, ainsi qu~une réduction significative de l~absorption de l~eau. L~agent de compatibilité est de préférence un terpolymère comprenant : a) de 0,5 à 20 pour cent en poids d~unités monomères choisies parmi l~anhydride maléique, l~anhydride maléique substitué, le mono-ester d~anhydride maléique, l~anhydride itaconique, l~acide maléique, l~acide fumarique, l~acide crotonique, l~acide acrylique et l~acide méthacrylique ; b) de 0 à 40 pour cent en poids d'unités monomères choisies parmi le styrène et le styrène fonctionnalisé ; et c) de 40 à 98,5 pour cent en poids d~unités monomères choisies parmi les méthacrylates et les acrylates d~alkyle en C1-8 et l~acétate de vinyle.

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