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US 4,734,324 AGranted
Heat sealable microporous polypropylene films
AssigneeHercules Incorporated
InventorDavid J. Hill
Life of this patent
Estimating the term…
Abstract
This invention relates to a microporous film having a heat sealable layer on one or both sides thereof. The porosity and permeability of the microporous layer are retained despite the application of the heat seal layer.
Claims8
A gas permeable microporous film comprising a voided polyolefin matrix having, on at least one of its surfaces, a coating of a heat sealable polymer having a melting point at least 10.degree. C. lower than that of the voided polyolefin matrix polymer.
Dependencies are inferred from the claim text.