B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 55/18 (2006.01) A61F 13/15 (2006.01) A61L 15/24 (2006.01)
Patent
CA 2299440
The present invention relates to a soft textured dimensionally stable microporous film comprising about 45 to about 60 %, by wt., filler, and a balance between a blend of linear low density polyethylene and high density polyethylene or other heat resistant polymer. The textured dimensionally stable microporous film is formed by extruding the formulation as a film, and orienting the film by passing through at least one set of intermesh gear rolls. The oriented film is annealed, reheated and, optionally, embossed to form the soft textured microporous film which is dimensionally stable at elevated temperatures.
La présente invention a trait à un film microporeux souple texturé stable dimensionnellement qui comporte d'environ 45 % à environ 60 % en poids de matière de charge, le reste étant constitué d'un mélange de polyéthylène basse densité linéaire et de polyéthylène haute densité ou d'un autre polymère résistant à la chaleur. On forme le film microporeux texturé stable dimensionnellement par extrusion de la formulation comme film, et par orientation du film en passant celui-ci à travers au moins un ensemble de cylindres dentés entrecroisés. Le film orienté est recuit, rechauffé et éventuellement grainé pour former le film microporeux souple texturé qui est stable dimensionnellement à des températures élevées.
Dipoto James
Hedden Chad M.
Kirby Eades Gale Baker
Tredegar Corporation
Tredegar Film Products Corporation
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