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US 4,777,073 AGranted
Breathable films prepared from melt embossed polyolefin/filler precursor films
AssigneeExxon Chemical Patents Inc.
InventorParesh J. Sheth
Life of this patent
Estimating the term…
Abstract
A breathable polyolefin film is prepared by melt embossing a highly filled polyolefin film to impose a pattern of different film thickness therein and by stretching the melt embossed film to impart greater permeability in the areas of reduced thickness in comparison to the areas of greater thickness.
Claims29
A method of making a breathable film comprising the steps of:
- mixing a polyolefin with a filler;
- extruding a precursor film from the polyolefin/filler mixture;
- melt embossing the precursor film to impose therein a pattern of different film thicknesses;
- and
- stretching the melt embossed precursor film to impart greater permeability in the areas of reduced thickness thereof in comparison to the areas of greater thickness.
2 more elements
A breathable film produced by a process comprising the steps of:
- mixing a polyolefin with a filler;
- extruding a precursor film from the polyolefin/filler mixture;
- melt embossing the precursor film to impose therein a pattern of different film thicknesses;
- and
- stretching the melt embossed precursor film to impart greater permeability in the areas of reduced thickness thereof in comparison to the areas of greater thickness.
2 more elements
A breathable film, comprising:
- a polyolefin and a filler;
- and
- a pattern of different film thicknesses having greater permeability in the areas of reduced thickness thereof in comparison to the areas of greater thickness.
A method of making a breathable film comprising the steps of:
- mixing a polyolefin with a filler;
- cast extruding a precursor film of the polyolefin/filler mixture onto at least one melt embossing roller to impose therein a pattern of different film thicknesses;
- and
- stretching the melt embossed precursor film in the transverse direclion to impart greater permeability in the areas of reduced thickness thereof in comparison to the areas of greater thickness.
1 more element
A breathable film produced by a process comprising the steps of:
- mixing a polyolefin with a filler;
- cast extruding a precursor film of the polyolefin/filler mixture onto at least one melt embossing roller to impose therein a pattern of different film thicknesses;
- and
- stretching the melt embossed precursor film in the transverse direction to impart greater permeability in the areas of reduced thickness thereof in comparison to the areas of greater thickness.
1 more element
Dependencies are inferred from the claim text.