Transparent high impact alloy

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 5/10 (2006.01) C08K 5/00 (2006.01) C08L 25/14 (2006.01) C08L 53/00 (2006.01) C08L 53/02 (2006.01)

Patent

CA 2467928

An improved tough, transparent polymer alloy comprised of 90 to 20 weight percent of a brittle polymer with a weight average molecular weight greater than 180,000; 0 to 60 weight percent of a rubbery polymer; 0 to 80 weight percent of a ductile polymer; and between greater than 0.4, i.e. between 0.5 and 3 weight percent of a plasticizer, i.e., mineral oil which resides in the brittle polymer. The brittle polymer can have molecular weights between 220,000 and 300,000, and may be as high as 400,000. In one of the preferred embodiments the brittle polymer is a copolymer of styrene and methyl methacrylate which copolymer ranges between 50 and 55 weight percent, the rubbery polymer is 0 weight percent, the ductile polymer is a styrene butadiene block copolymer ranging between 45 and 50 weight percent, and the mineral oil is 1.5 weight percent. Notched IZOD impact strength ranges between 1.0 to 6.0 ft-lb./in., preferably between 2.0 and 4.5 ft-lb./in. The haze can be less than 1.5% or it can be between 1 and 4%.

L'invention concerne un alliage polymère amélioré, transparent et résistant, qui comprend, en poids, entre 90 et 20 % de polymère friable dont la masse moléculaire moyenne en poids est supérieure à 180 000; entre 0 et 60 % de polymère caoutchouteux; entre 0 et 80 % de polymère ductile; et entre 0,5 (plus de 0,4) et 3 % de plastifiant, à savoir l'huile minérale se trouvant dans le polymère friable. Ce polymère friable peut avoir un poids moléculaire compris entre 220 000 et 300 000, pouvant même aller jusqu'à 400 000. Selon un mode de réalisation préféré, le polymère friable est un copolymère de styrène et de méthacrylate de méthyle. En poids, on a alors entre 50 et 55 % de copolymère de ce type, 0 % de polymère caoutchouteux, entre 45 et 50 % de polymère ductile, qui est un copolymère bloc de styrène-butadiène, et 1,5 % d'huile minérale. A l'essai de choc IZOD sur barreau entaillé, la résistance est comprise, en pied-livre/pouce, entre 1 et 6, et de préférence entre 2 et 4,5. Le trouble peut être inférieur à 1,5 %, ou bien il peut être compris entre 1 et 4 %.

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