Molding of polypropylene with enhanced reheat characteristics

Details Molding of polypropylene with enhanced reheat characteristics Molding of polypropylene with enhanced reheat characteristics

C - Chemistry, Metallurgy

08

K

C08K 3/34 (2006.01) B65D 1/34 (2006.01) C08L 23/10 (2006.01)

Patent

CA 2517818

Bottles, containers and other articles are formed from polypropylene compositions that include a reheating agent, such as antimony, carbon black, graphite, titanium, copper, manganese, iron, tungsten, graphite, infra-red absorbing dyes or other infra-red absorbing material. The reheating time for the polypropylene composition is shortened for injection stretch blow molding or thermoforming, and the polypropylene granule composition with reheating agent has an L* value of at least 80 % of the L* value for a polypropylene granule control without added reheating agents as measured by the Gardner color test. The reheating agent may be incorporated into the polypropylene composition by in situ chemical reduction of a metal compound, such as antimony triglycolate, with a reducing agent, such as hypophosphorous acid. In addition, the polypropylene composition with reheating agent may be derived from a polypropylene masterbatch with high concentrations of reheating agent.

L'invention concerne des bouteilles, des conteneurs et d'autres articles formés à partir de compositions de polypropylène contenant un agent de postcombustion, tel que de l'antimoine, du noir de carbone, du graphite, du titane, du cuivre, du manganèse, du fer, du tungstène, du graphite, des colorants ou d'autres matériaux absorbant le rayonnement infrarouge. Le temps de postcombustion de la composition de polypropylène est raccourci en vue d'une injection-soufflage avec bi-étirage ou en vue d'un thermoformage, et la composition de granule de polypropylène à agent de postcombustion comprenant une valeur L* d'au moins 80 % de la valeur L* pour un contrôle de granule de polypropylène sans adjonction d'agents de postcombustion tels que mesurés par le test de couleur Gardner. L'agent de postcombustion peut être incorporé dans la composition de polypropylène par réduction chimique in situ d'un composé métallique, notamment un triglycolate d'antimoine, au moyen d'un agent de réduction, notamment un acide hypophosphore. En outre, la condition de polypropylène à agent de postcombustion peut être dérivée d'un mélange maître de polypropylène à concentrations élevées en agent de postcombustion.

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