Method for making fiber reinforced polypropylene composites

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 5/04 (2006.01) B29C 45/00 (2006.01) B60J 5/04 (2006.01) C08L 23/10 (2006.01)

Patent

CA 2608892

The present invention is directed generally to processes for making fiber reinforced polypropylene resins including at least 25 wt% polypropylene based polymer, from 5 to 60 wt% organic fiber, and from 0 to 60 wt% inorganic filler. The process includes extrusion compounding the polypropylene based polymer, the organic fiber, and the inorganic filler to form a fiber reinforced polypropylene resin, which is subsequently molded to form an article with a flexural modulus of at least 300,000 psi, that exhibits ductility during instrumented impact testing (15 mph, -29~C, 25 lbs). Twin screw extruder compounding processes where the organic fiber is continuously fed to the extruder hopper by unwinding from one or more spools, and uniformly dispersed in the fiber reinforced polypropylene resin by twin screws having a combination of conveying and kneading elements are also disclosed.

L'invention concerne généralement des procédés de fabrication de résines de polypropylène renforcées par des fibres, comprenant au moins 25 % en poids de polymère à base de polypropylène, de 5 à 60 % en poids de fibre organique, et de 0 à 60 % en poids de charge inorganique. Ce procédé consiste à mélanger par extrusion le polymère à base de polypropylène, la fibre organique et la charge inorganique pour former une résine de polypropylène renforcée par des fibres, le tout étant ensuite moulé pour former un article à module d'élasticité en flexion d'au moins 300 000 psi et ductile pendant l'essai de choc instrumenté (15 mph, -29 °C, 25 lbs). Sont également décrits des procédés de mélangeage par extrudeuse à vis jumelles, dans lesquels la fibre organique est envoyée en continu dans la trémie du mélangeur par déroulement d'une ou plusieurs bobines, et est dispersée de manière homogène dans la résine de polypropylène renforcée par des fibres par des vis jumelles possédant une combinaison d'élément de transport et de malaxage.

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