Improved rubber modified monovinylidene aromatic polymer...

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 25/12 (2006.01) C08L 9/00 (2006.01) C08L 27/12 (2006.01) C08L 83/04 (2006.01) C08L 51/04 (2006.01)

Patent

CA 2344344

The present invention is an improved rubber-modified polymeric composition comprising: (a) a continuous matrix phase comprising an interpolymer of a monovinylidene aromatic monomer and an ethylenically unsaturated nitrile monomer; and (b) from 5 to 40 weight percent, based on the total weight of said polymeric composition, of a rubber in the form of discrete rubber particles dispersed in said matrix, wherein the dispersed rubber particles comprise: (1) at least 33 weight percent based on the total rubber content, of a mass rubber particle component having a volume average particle diameter of from 0.15 to 0:.40 micron; (2) from 15 to 67 weight percent based on the total rubber content, of a small-particle emulsion rubber component having a volume average diameter of from 0.05 to 0.30 micron; and (3) from 0 to 35 weight percent based on the total rubber content, of a large emulsion particle rubber component having a volume average diameter of from greater than 0.30 to 2.0 micron; wherein the rubber particles of the composition have an average light absorbance ratio of less than 1.4.

Composition polymère modifiée au caoutchouc améliorée qui comporte (a) une phase matrice continue contenant un interpolymère d'un monomère aromatique monovinylidène et d'un monomère nitrile éthyléniquement insaturé et (b) de 5 à 40 % en poids, sur la base du poids total de ladite composition polymère, d'un caoutchouc sous forme de particules de caoutchouc séparées dispersées dans la matrice. Lesdites particules de caoutchouc dispersées comprennent (1) au moins 33 % en poids, sur la base de la quantité totale de caoutchouc, d'un constituant sous forme de particules de caoutchouc polymérisé en masse ayant un diamètre moyen volumique des particules de 0,15 à 0,40 micron, (2) de 15 à 67 % en poids, sur la base de la quantité totale de caoutchouc, d'un constituant sous forme de caoutchouc polymérisé en émulsion à petites particules ayant un diamètre moyen volumique de 0,05 à 0,30 micron et (3) de 0 à 35 % en poids, sur la base de la quantité totale de caoutchouc, d'un constituant sous forme de caoutchouc polymérisé en émulsion à grosses particules ayant un diamètre moyen volumique allant de plus de 0,3 à 2,0 microns, les particules de caoutchouc de ladite composition ayant un taux moyen d'absorption de la lumière inférieur à 1,4.

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