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US 4,491,617 AGranted
Reinforcing composite for roofing membranes and process for making such composites
AssigneeBay Mills Limited
InventorsTerry J. O'Connor, Ian G. Cooper
Life of this patent
Estimating the term…
Abstract
A reinforcing composite for bituminous roofing membranes is made by laminating fiberglass and polyester mats and scrims coated with selected adhesives.
Claims20
A composite for reinforcing roofing membranes comprising three layers one of which is made of fiberglass, one of which is made of polyester, and the third of which is made of either polyester or fiberglass;
- at least one of which is in the form of a scrim coated with a thermoplastic adhesive, one of which is in the form of a mat, and a third of which is in the form of a mat or a scrim;
- wherein the composite is flexible, capable of being impregnated by a bituminous material, and has sufficient strength to be useful in reinforcing roofing membranes.
A process for making a composite to use in reinforcing roofing membranes comprising the steps of:
- selecting at least three materials, one of which is fiberglass, one of which is polyester, and the third of which is fiberglass or polyester;
- one of which is in the form of a scrim coated with a thermoplastic adhesive, one of which is in the form of a mat, and the third of which is in the form of either a mat or a scrim;
- passing these layers through one or more hot nips to heat the thermoplastic adhesive and bind the layers together;
- and
- cooling the composite thus created;
- wherein, the resulting composite is flexible, capable of being impregnated by bituminous material, and has sufficient strength to be useful in reinforcing roofing membranes.
3 more elements
Dependencies are inferred from the claim text.