Cloth-like fiber reinforced polypropylene compositions and...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 23/12 (2006.01) B29B 7/46 (2006.01) B29B 9/14 (2006.01) B29C 45/00 (2006.01) B29C 70/06 (2006.01) C08J 5/04 (2006.01) C08K 3/34 (2006.01) C08K 7/02 (2006.01) C08L 67/02 (2006.01)

Patent

CA 2606611

The present invention is directed generally to cloth-like fiber reinforced polypropylene compositions, and the beneficial mechanical and aesthetic properties imparted by such compositions. The cloth-like fiber reinforced polypropylene compositions include at least 25 wt% polypropylene based polymer, from 5 to 60 wt% organic reinforcing fiber, from 0 to 60 wt% inorganic filler, and from 0.1 to 2.5 wt% colorant fiber. A method of making fiber reinforced polypropylene compositions and molding articles there from is also disclosed and includes the steps of twin screw extrusion compounding the composition to form a resin and injection molding the resin to form a cloth- like article. Articles molded from these fiber reinforced polypropylene compositions have a flexural modulus of at least 300,000 psi, exhibit ductility during instrumented impact testing, and exhibit a cloth-like appearance. The cloth-like fiber reinforced polypropylene compositions of the present invention are particularly suitable for making molded articles including, but not limited to household appliances, automotive parts, and boat hulls.

L'invention concerne généralement des compositions de polypropylène renforcées par des fibres du type étoffe et les propriétés esthétiques imparties par lesdites compositions. Ces compositions de polypropylène renforcées par des fibres du type étoffe comprennent au moins 25 % en poids de polymère à base de polypropylène, de 5 à 60 % en poids de fibre de renforcement organique, de 0 à 60 % en poids de charge inorganique et de 0,1 à 2,5 % en poids de fibre colorante. Un procédé de fabrication de compositions de polypropylène renforcées par des fibres et de moulage d'articles à partir de celles-ci est également décrit et consiste à mélanger par extrusion par vis jumelles la composition pour former une résine et à mouler par injection la résine pour former un article du type étoffe. Les articles moulés à partir de ces compositions de polypropylène renforcées par des fibres possèdent un module d'élasticité en flexion d'au moins 300 000 psi, sont ductiles pendant l'essai de choc instrumenté (15 mph, -29 °C, 25 lbs) et ont l'apparence d'une étoffe. Les compositions de polypropylène renforcées par des fibres du type étoffe de l'invention conviennent particulièrement à la fabrication d'articles moulés, dont entre autres, des appareils ménagers, des pièces d'automobile et des coques de bateau.

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