Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1995-06-06
1997-01-14
Choi, Kathleen
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428107, 428109, 428110, 428105, 428114, 428232, 428247, B32B 512
Patent
active
055937667
ABSTRACT:
A puncture resisting and processability improving composite for reinforcing bituminous roofing membranes that are free of organic mats. The composite includes a lightweight open grid of over-under construction, the grid having polyester yarns of about 30 to about 300 denier in the machine direction and about 30 to about 300 denier in the cross-machine direction, a yarns per inch count of about 3.times.3 to about 10.times.10 in each of the machine and cross-machine directions, and a dry weight pick-up of about 60 to about 250 parts of binder to 100 parts by weight of polyester in the grid, in which an adhesive that is one of dissolved and dispersed in a liquid is applied to the composite so that the open grid is held together by the adhesive alone. The composite also includes a high strength reinforcing fabric consisting essentially of a non-woven open grid of polyester having no mechanical connections at cross-over points in the grid, which is combined with the adhesively secured lightweight polyester open grid. The lightweight grid and the high strength reinforcing fabric are so arranged and constructed as to have sufficient binder and surface area to hold high strength grids inside bituminous material of a roofing membrane during manufacture of the roofing membrane and to provide a roofing membrane that is free of any organic mat.
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Bay Mills Limited
Choi Kathleen
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