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Composite for reinforcing bituminous roofing membranes including a lightweight grid of over-under construction
| Details |
Inventors: Woiceshyn, D. Mark;
Assignee: Bay Mills Limited (St. Catharines, CA)
Primary Examiner: Choi; Kathleen
Assistant Examiner:
Attorney, Agent or Firm: Fitzpatrick, Cella, Harper & Scinto
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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DETAILED DESCRIPTION What is claimed is: 1.
A puncture resisting and processability improving composite for reinforcing bituminous roofing membranes that are free of organic mats, the composite consisting essentially of: a lightweight open grid of over-under construction, in which yarns in the cross-machine direction are held between pairs of yarns in the machine direction lying essentially one above the other, said 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 an adhesive binder to 100 parts by weight of polyester in the grid, in which the adhesive, which 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, and 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, said lightweight grid and said high strength reinforcing fabric being so arranged and constructed as to have sufficient binder and surface area to hold the composite and any additional reinforcements 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.
2.
A composite according to claim 1, in which the lightweight open grid has no mechanical connection at cross-over points of the machine and cross-machine direction yarns.
3.
A composite according to claim 1, in which the cross-machine direction yarns are held between pairs of machine direction yarns lying essentially one above the other.
4.
A composite according to claim 3, in which upper machine direction yarns lie in one plane, lower machine direction yarns lie in a second plane and cross-machine direction yarns lie between upper and lower machine direction yarns in an intermediate plane
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