Polypropylene-based composite resin composition

Details Polypropylene-based composite resin composition Polypropylene-based composite resin composition

C - Chemistry, Metallurgy

08

L

C08L 53/00 (2006.01) C08L 23/08 (2006.01) C08L 23/16 (2006.01)

Patent

CA 2474749

A polypropylene-based composite resin composition in which: (1) the complex viscosity .eta.* as measured at 190~C and an angular frequency (.omega.) of 0.1 rad/s is 2,000 Pa.cndot.s or higher; (2) the storage moduli in shear G'100, G'10, G'0.1, and G'0.01 as measured at 90~C and angular frequencies of 100, 10, 0.1, and 0.01 rad/s respectively satisfy the following relationships (I) and (II); log(G'100)-log(G'10)>=0.6 (I) log(G'0.1)-log(G'0.01)<=0.4 (II) and (3) the storage modulus in shear G'0.0251 as measured at 190~C and an angular frequency of 0.0251 rad/s is 60 Pa or higher. Even when injection- molded at a shortened molding cycle time, the composition is less apt to cause failures such as short shot, burrs, surface adhesion failures, deformation, and legginess.

L'invention concerne une composition de résine composite à base de polypropylène dans laquelle: 1) la viscosité complexe .eta.* mesurée à 190 ·C et à une vitesse angulaire (.omega.) de 0,1 rad/sec est égale à 2 000 Pa/sec ou plus; 2) les modules de conservation G'¿100?, G'¿10?, G'¿0,1? et G'¿0,01? mesurés à 90 ·C et à des vitesses angulaires de 100, 10, 0,1 et 0,01 rad/sec obéissent respectivement aux relations suivantes: log(G'¿100?)-log(G'¿10?)>=0,6 (I) et log(G'¿0,1?)-log(G'¿0,01?)<= (II); et 3) le module de conservation G'¿0,0251? mesuré à 190 ·C et à une vitesse angulaire de 0,0251 rad/sec est de 60 Pa/sec ou plus. Même lorsqu'elle est moulée par injection pendant un cycle de moulage raccourci, la composition est moins sujette à des défaillances telles que moulage court, bavures, défauts d'adhésion de surface, déformation et formation de bâtonnets.

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