Back to results
US 2022/0089846 A1Published application
Breathable film
AssigneeRkw SE
InventorsRobert KOPLIN, Dennis BECKER, Christoph MEIER, Thomas ARLT
Life of this patent
Estimating the term…
Abstract
The invention relates to a breathable film. The specific ball-drop impact resistance of the film is more than 100 mm per gram polymer per square meter. The film has a water vapor permeability of at least 1000 g/m2 in 24 hours. The elongation at break of the film in the machine direction is less than 200%.
Claims15
A breathable film, comprising:
- a polymer film having a specific ball drop fall height that is more than 100 mm per gram of polymer per square meter or a specific dart drop that is more than 19 g per gram of polymer per square meter or a specific water column that is more than 90 mm per gram of polymer per square meter;
- a water vapor permeability of at least 1000 g/m2 in 24 hours;
- and a breaking elongation in a machine direction that is less than 200%.
The film as claimed in claim b 7, wherein the proportion of the LLDPE component of relatively high density is more than 2% by weight and is less than 12% by weight.
A process for producing a breathable film, comprising the steps of:
- producing a composition comprising
- fillers,
- an LLDPE component of relatively low density, and
- an LLDPE component of relatively high density,
- blow extruding the composition to form a film,
- stretching the film in a machine direction,
- passing the film over at least one temperature-controlled roller to reduce a propensity for shrinkback.
4 more elements
Dependencies are inferred from the claim text.