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US 2001/0017431 A1Published application
Bioriented polyethylene film with a high water vapor transmission rate
AssigneeExxonMobil Oil Corporation
InventorsHans Joachim Pip, Rhonda Rogers Agent
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Abstract
Methods of producing polyethylene films having a desired water vapor transmission rate (WVTR) are provided. The methods include casting a polyethylene sheet which has a base layer of a polyethylene and a cavitating agent, and at least one layer of a WVTR-controlling material, and subsequently biaxially orienting the sheet to yield a film having the desired WVTR. The base layer has a porous microstructure and a WVTR substantially higher than the desired WVTR.
Claims10
A method of producing a multilayer polyethylene film comprising the steps of:
- (i) casting a polyethylene sheet comprising:
- (a) a base layer comprising polyethylene and a cavitating agent, and
- (b) a layer of a WVTR-controlling material coextensively adherent to a side of the base layer;
- and
- (ii) biaxially orienting said polyethylene sheet resulting from step (i) to obtain a WVTR of greater than 0.2 g/100 inch2·day in the multilayer polyethylene film;
- wherein the base layer has a porous microstructure and a WVTR higher than the WVTR of the multilayer polyethylene film.
3 more elements
Dependencies are inferred from the claim text.