Composite sheet made from fabric and polyetherimide with controlled porosity
AssigneePorcher Industries
InventorEric FOREST
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Abstract
A composite sheet including at least a textile structure and a polyetherimide (PEI), the latter impregnating and densifying the textile structure, the sheet having a porosity of between approximately 3% and approximately 8% by mass of acetone sorption, and preferably between approximately 4% and approximately 5%, as measured by the acetone uptake method; the manufacturing method including continuous or semi-continuous molding; the sheet being used inter alia as a skin of a foamed structure made from PEI.
Claims22
A composite sheet comprising at least one fabric and a polyetherimide (PEI), wherein the PEI has a mass molecular weight (MW) of between 20,000 g/mol and 100,000 g/mol, the PEI impregnates and densifies the fabric, the composite sheet has an acetone porosity of from 3% to 8% by weight of acetone absorption, as measured by the acetone uptake method that consists of, on a 40×40 mm test piece of the composite sheet, dried for 2 h at 70° C., weighing the initial mass of the test piece, then placing the test piece in overlapping acetone for 24 h, recovering the sample, wiping it and weighing it, comparing with the initial mass and deducing the acetone uptake as a mass.
Dependencies are inferred from the claim text.