B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1041, 18/796
B29C 47/06 (2006.01) B29C 55/02 (2006.01) B29C 55/28 (2006.01) B32B 27/18 (2006.01)
Patent
CA 2040846
A tubular multilayer film including at least two, biaxially stretched tubular layers each formed of a polypropylene resin, wherein the innermost layer contains spherical antiblocking agent particles having an average particle size of 0.2 to 5 µm in an amount of 0.1 to 0.7 % by weight, and the outermost layer is free of the spherical antiblocking agent particles is disclosed. The multilayer film may be prepared by biaxially stretching a multilayer tubular raw sheet having an innermost polypropylene layer containing spherical antiblocking agent particles and an outermost polypropylene layer free of such antiblocking agent particles
Cette invention concerne une pellicule multicouche tubulaire comprenant au moins deux couches tubulaires étirées biaxialement et chacune formée de résine de polypropylène, la couche intérieure renfermant des particules sphériques d'antiadhérent dont la taille moyenne se situe entre 0,2 et 5 micromètres pour une teneur en poids de 0,1 à 0,7 % et la couche extérieure étant exempte de particules d'antiadhérent. L'objet de l'invention peut être réalisé par étirage biaxial d'une feuille multicouche tubulaire non traitée dont la couche intérieure renferme des particules sphériques d'antiadhérent et dont la couche extérieure en est exempte.
Ishiguro Nobuya
Kondo Kazuo
Tada Teruo
Wano Toyoki
Yoshida Teruaki
Ltd, Okura Industrial Co.
Sim & Mcburney
Sumitomo Chemical Co. Ltd.
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