Bituminous roofing underfelt and base felt therefor

Details Bituminous roofing underfelt and base felt therefor Bituminous roofing underfelt and base felt therefor

1993-10-01

1997-08-26

McCamish, Marion E.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428156, 428170, 428213, 428171, 428219, B32R 1110

Patent

active

056609159

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.

REFERENCES:
patent: 4342804 (1982-08-01), Meynard
patent: 4987027 (1991-01-01), Zerfass et al.
patent: 5130178 (1992-07-01), Zerfass et al.
patent: 5173355 (1992-12-01), Vock et al.
patent: 5219635 (1993-06-01), Welter et al.
patent: 5219647 (1993-06-01), Vock et al.

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