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US 4,543,158 AGranted
Sheet type felt
AssigneeGAF Corporation
InventorsAlfredo A. Bondoc, Eugene J. Flood, Frederick W. Sieling
Life of this patent
Estimating the term…
Abstract
Sheet type felt material comprising 5-20 wt % glass fibers, 40-80 wt % cellulose fibers, 5-25 % binder and 3-20 wt % asphalt. The felt is made on conventional felt making equipment and may be used as siding or roofing underlayment or as facer for foam insulating boards.
Claims12
Sheet type felt between about 0.4 and about 4 millimeters thick comprising on a dry basis:
- (a) between about 40 and about 80 wt % cellulosic fibers;
- (b) between about 5 and about 20 wt % glass fibers;
- (c) between about 5 and about 15 wt % non-asphaltic binder;
- and
- (d) between about 3 and about 20 wt % asphalt.
2 more elements
Method of making sheet type felt which comprises:
- (a) forming an aqueous slurry comprising on a dry basis:
- (1) between about 40 and about 80 wt % cellulosic fibers;
- (2) between about 5 and about 20 wt % glass fibers;
- (3) between about 5 and about 15 wt % non-asphaltic binder;
- and
- (4) between about 3 and about 20 wt % asphalt in the form of asphaltic emulsion;
- and
- (b) then forming felt between about 0.4 and about 4 millimeters thick from said slurry.
5 more elements
Dependencies are inferred from the claim text.