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US 7,459,180 B2Granted
Process for making skid resistant moisture barriers
AssigneeW. R. Grace & Co.-Conn.
InventorsJamal N. Hamdar, Russell A. Victoria, Carmen J. Melillo, Jyoti Seth, James R. Hansen, Robert Sorrentino
Life of this patent
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Abstract
Skid-resistant moisture barriers of the invention, such as house wrapping, waterproofing membranes, and roofing underlayrnents, have a carrier sheet with polymer nodules deposited thereon through a rotating screen roll or by transfer means such as a gravure roll. Precise coating levels and polymer distribution can be achieved more easily when compared with prior art coating and embossing methods.
Claims9
A process for making a waterproofing membrane for a roof surface comprising:
- providing a carrier sheet constructed of a plastic film, woven fabric, or nonwoven fabric, said carrier sheet having a first major face which, in use, will be exposed to foot traffic and a second major face which, in use, will be adhered to a roof surface;
- providing on said first major face of said carrier sheet a skid-resistant polymer in a repeating pattern of shapes by depositing said polymer through a transfer process comprising
- (A) contacting said polymer upon a circumferential surface of a gravure roll having a cylindrical body, said circumferential surface having an image portion and a non-image portion, said image portion defined by a plurality of cell openings etched, incised, or indented into said circumferential surface, said plurality of cell openings having at least two different average depths, and
- (B) wiping said circumferential surface continuously with a doctor blade whereby said gravure roll is operative to transfer in one step onto said carrier sheet first major face (i) a continuous base coating formed by residual polymer wiped by said doctor blade against said non-image portion of said circumferential surface and (ii) a pattern formed by polymer wiped into said plurality of cell openings of said image portion by said doctor blade;
- and thereafter applying a coating of finely divided particulate material to said polymer deposited on said carrier sheet first major face, and attaching on said second major face of said carrier sheet a self-adhesive, continuous bituminous or synthetic waterproofing adhesive layer operative to adhere said second major face to a roof surface and provide a moisture seal, said waterproofing adhesive layer having a thickness no less than 5 mils and no greater than 100 mils, and wherein said skid-resistant polymer on said first major face is operative to provide skid-resistance to foot traffic when said waterproofing membrane is installed on a roof surface.
2 more elements
Dependencies are inferred from the claim text.