Coupling agents for natural fiber-filled polyolefins and...

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 8/46 (2006.01) C08F 255/00 (2006.01) C08L 1/00 (2006.01) C08L 23/04 (2006.01) C08L 51/06 (2006.01) C08L 97/02 (2006.01)

Patent

CA 2643440

The invention is a coupling agent, which is made from a polyolefin composition and is for wetting a cellulosic fiber. The coupling agent desirably includes a polyolefin resin having a melt flow index at 1900C and 2.16 kg of about 0.5 to 100 (g/10 min). The polyolefin resin is combined with 1.6 to 4.0 weight percent maleic anhydride, and the composition has less than 1,500 ppm of free maleic anhydride. The coupling agent has a yellowness index of 20 to 70. A cellulosic composite can be made from the coupling agent by combining the coupling agent with cellulosic fiber and at least one thermoplastic polymer.

La présente invention concerne un agent de couplage fabriqué à partir d'une formule de polyoléfine et employé pour humidifier une fibre de cellulose. L'agent de couplage inclut idéalement une résine polyoléfinique d'indice de fluidité à chaud à 190 °C et 2,16 kg compris entre environ 0,5 et 100 (g/10 min). La résine polyoléfinique est combinée à 1,6 à 4,0 pour cent en poids d'anhydride maléique, et la formule contient moins de 1500 ppm d'anhydride maléique libre. L'agent de couplage présente un indice de jaunissement compris entre 20 et 70. Un composite cellulosique peut être fabriqué à partir de l'agent de couplage par combinaison de l'agent de couplage avec une fibre de cellulose et au moins un polymère thermoplastique.

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