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US 4,775,567 AGranted
Waterproofing laminate
AssigneeHyload Corporation
InventorAlex W. Harkness
Life of this patent
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Abstract
A waterproofing laminate suitable for use in roofs, floors, or other surfaces where waterproofing is desired, comprises an elastomeric sheet secured to a modified bitumen layer and a release sheet secured to the modified bitumen layer. Certain preferred materials for use in the laminate are recited.
Claims6
A waterproof laminate comprising:
- an elastomeric sheet;
- said elastomeric sheet comprising about 10 to 40 percent by weight of unplasticized polyvinyl chloride;
- about 10 to 40 percent by weight of ethylene vinyl acetate carbon monoxide terpolymer;
- about 5 to 35 percent by weight of coal tar pitch;
- the remainder being particulate filler, fibrous filler, plasticizer, processing aids and stabilizers;
- a modified bitumen layer secured to said elastomeric sheet;
- said modified bitumen layer containing a material selected from the group consisting of natural rubber, synthetic rubber, natural resin, and synthetic resin;
- and
- a release sheet secured to said modified bitumen layer, whereby the removal of said release sheet will permit securement of said waterproofing laminate to a surface by application of pressure to said elastomeric sheet-modified bitumen layer.
6 more elements
Dependencies are inferred from the claim text.