Molded polyolefin and process for producing the same

Details Molded polyolefin and process for producing the same Molded polyolefin and process for producing the same

B - Operations, Transporting

32

B

B32B 27/32 (2006.01) B29C 65/02 (2006.01) B29C 65/48 (2006.01) C08J 5/00 (2006.01) C08J 5/12 (2006.01) C08J 7/02 (2006.01)

Patent

CA 2281654

A molded polyolefin which is excellent in mechanical properties and dimensional stability under heating and can be easily produced without the use of a reinforcement of a different kind, e.g., glass fibers. The molded polyolefin comprises a stretched polyolefin material so as to have an average coefficient of linear expansion at 20~C to 80~C of 5x10-5 (/~C) or lower. The process for producing the same comprises the steps of depositing a low- molecular compound in which polyolefins are soluble on the surface of a stretched polyolefin material having an average coefficient of linear expansion at 20~C to 80~C (C of 5x10-5 (/~C) or lower and then bonding the deposit by pressing and heating.

L'invention porte sur des polyoléfines moulées excellentes de par leurs propriétés mécaniques et leur stabilité dimensionnelle et pouvant se fabriquer facilement sans avoir à utiliser de renforts de nature différente tels que par exemple des fibres de verre. Les polyoléfines moulées consistent en un matériau polyoléofinique étiré de manière à présenter un coefficient moyen de dilatation linéaire de 5x10?-5¿ (/·C) ou moindre. Leur procédé de fabrication comporte les étapes suivantes: dépôt d'un composé à faible poids moléculaire où les polyoléfines sont solubles sur la surface d'un matériau polyoléofinique étiré présentant un coefficient moyen de dilatation linéaire de 5x10?-5¿ (/·C) ou moindre, puis fixation du dépôt par pressage et chauffage.

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