Weatherable resinous compositions

Details Weatherable resinous compositions Weatherable resinous compositions

C - Chemistry, Metallurgy

08

L

C08L 25/02 (2006.01) C08F 285/00 (2006.01) C08L 25/12 (2006.01) C08L 51/04 (2006.01)

Patent

CA 2249899

A thermoplastic molding composition which features improved impact and flow properties as well as reduced opacity is disclosed. The composition contains (A) 15 to 50 percent of a grafted rubber which contains (a) a crosslinked rubber substrate which contains, as a core, about 1 to 25% relative to its weight of at least one vinylaromatic polymer, and (b) a grafted phase, and (B) 85 to 50 percent of a copolymeric matrix. The composition, which contains no additional grafted rubber components, is also characterized in that (i) the substrate amounts to 60 to 90 percent, and grafted phase amounts to 40 to 10 percent, relative to the weight of the grafted rubber and that (ii) the grafted rubber has a monomodal size distribution and that (iii) the grafted rubber has a weight average particle size of about 0.2 to 1.0 microns.

Divulgation d'une composition thermoplastique pour moulage possédant des propriétés de chocs et rhéologiques améliorées, ainsi qu'une opacité réduite. Cette composition comprend : A) de 15 à 50 % d'un caoutchouc greffé, contenant a) un substrat de caoutchouc réticulé renfermant comme choeur de 1 à 25 %, en poids, d'au moins un polymère aromatique vinylique, et b) une phase greffée, et B) de 85 à 50 % d'une matrice copolymère. Cette composition, qui ne contient aucun autre composant caoutchouteux greffé, est également caractérisée par le fait que i) le substrat représente de 60 à 90 % et la phase greffée de 40 à 10 %, par rapport au poids de caoutchouc greffé, ii) le caoutchouc greffé a une distribution de taille monomode et iii) le caoutchouc greffé a une taille de particule moyenne pondérée allant d'environ 0,2 à 10 microns.

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