Method for manufacture of polyolefin shaped articles

B - Operations – Transporting – 29 – C

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Details

B29C 55/02 (2006.01) B29C 43/24 (2006.01) B29C 55/00 (2006.01) B29C 55/18 (2006.01) B29C 67/24 (2006.01) C08J 5/18 (2006.01) C08J 7/00 (2006.01) C08J 7/18 (2006.01)

Patent

CA 2269859

A polyolefin shaped article having high strength and high modulus is efficiently manufactured without a need to accompany a process of removing a flow modifier or the like. A method includes the steps of melt forming a composition principally containing 100 parts by weight of high-density polyolefin, such as high-density polyethylene, and 3 - 30 parts by weight of a polymerizable unsaturated compound having a preferred affinity for the high-density polyolefin into a sheet or film, calendering and stretching the sheet or film, and then polymerizing the polymerizable unsaturated compound incorporated in the stretched sheet or film.

L'invention porte sur un procédé de production efficace de moulages polyoléfiniques présentant une haute résistance et un module élevé, et permettant d'obtenir dans l'étape d'extraction une meilleure aptitude à l'écoulement. Ce procédé se caractérise par le moulage par injection de matière fondue d'une composition comprenant, comme composants principaux, 100 parties en poids d'une polyoléfine de haute densité telle que le polyéthylène de haute densité, et 1 à 30 parties en poids d'un monomère ou oligomère polymérisable ayant une affinité pour la polyoléfine de haute densité présente dans une feuille ou un film, ce procédé consistant à soumettre cette polyoléfine, présente dans une feuille ou un film, à un laminage et à un étirement, et à la polymériser.

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