Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1977-04-22
1978-10-24
Cannon, J.C.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
52 11, 52 12, 52 16, 52302, 428489, B32B 1104, D06N 500, E04D 1304, E04D 1308
Patent
active
041222300
ABSTRACT:
Roof drain flashing constituting a tough flexible material bondable to any type roof membrane and capable of accommodating thermal expansion and contraction of the roof without cracking and leaking at the drain, being a layer of nonplasticized chlorinated polyethylene integrally and irreversibly joined to a layer of asphalt-saturated roofing felt. The non-plasticized chlorinated polyethylene is physically joined to the asphalt-saturated felt by pressing the two together at pressures in the 4000 PSI range just subsequent to the CPE being extruded and cooled to the 250.degree. F range, having passed through the extrusion die at considerably higher temperatures.
REFERENCES:
patent: 3321357 (1967-05-01), Kennedy
patent: 3474625 (1969-10-01), Draper et al.
patent: 3641216 (1972-02-01), Schnebelen et al.
patent: 3721578 (1973-03-01), Bennett et al.
patent: 3909144 (1975-09-01), Garn et al.
patent: 3950207 (1976-04-01), Amat
patent: 3953974 (1976-05-01), Bresson et al.
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