The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 26, 1997
Filed:
Oct. 01, 1993
Michael Schoeps, Grossaitingen, DE;
Bertrand Claude Weiter, Bobingen, DE;
Franz Kaulich, Bobingen, DE;
Hoechst Aktiengesellschaft, Frankfurt, DE;
Abstract
There is described a bituminous roofing underfelt comprising a spunbond of polyester, in particular polyethylene terephthalate, filaments having a filament linear density of 1-8 dtex embedded in a bitumen matrix, wherein the weight of the bitumen accounts for from 40 to 90% and that of the spunbonded for from 10 to 60% of the basis weight of the roofing underfelt, and the spunbond is consolidated by a meltable binder whose melting point is below the processing temperature of the bitumen used in making the bituminous roofing underfelt and which is present in the spunbonded in a weight proportion of from 5 to 20% of the total weight. The spunbonded preferably bears an embossed pattern, for example a plain-weave embossment. There is also described a process for manufacturing the roofing underfelt and the spunbond present therein.