Hoechst Aktiengesellschaft

Johns Manville

Franz Kaulich

Bertrand Claude Weiter

Hans Wagner

Michael Schops

Karl-Christian Zerfass

Peter Heidel

Michael Sch&ouml;ps

Heinz Artus

Michael Schoeps

There are described a dimensionally stable laminate whose surfaces are formed by spunbonded webs and comprising at least two layers of spunbonded and at least one laid layer of reinforcing yarn, the laid layer or layers each being disposed between two layers of spunbonded and having a thread density of from 0.5 to 3 threads/cm, spunbonded and laid layers having been joined together by needling at about 20-70 stitches/cm,, a process for manufacturing this laminate, and its use for manufacturing roofing sheets and roof sealing sheets.

Laminate with web and laid components

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.

Bituminous roofing underfelt and base felt therefor

Described is a multilayered base layer comprising at least one textile layer and at least one copper layer which are joined together by needling, wherein the puncture holes produced in the copper layer by the needling have a diameter of not more than 1 mm, and a process for producing it. Also described is the use of this layer as a starting material for producing bituminized sealing felts and also the use of the multilayered base layer and of the bituminized sealing felts produced therefrom for discharging electrostatic charges.

Root-resistant base layer

There is described a sheathing web consisting essentially of a waterproof-coated spunbonded of filaments of organic fiber-forming material. The sheathing web has on at least one surface a structure in the form of a weave pattern for increasing the slip resistance, this pattern having been embossed into the spunbonded in the course of its production.

Sheathing web

There is described a support web for roofing membranes which comprises a spunbonded made of polyester filaments. The spunbonded has a basis weight of from 50 to 100 g/m.sup.2 coupled with a filament denier of from 1 to 8 dtex and has been consolidated with a fusible binder. This produces a high tear propagation resistance and nail pullout strength and also good dimensional stability at high temperatures. The spunbonded support web is therefore particularly suitable for bitumenized roofing membranes.

Support web for roofing membranes

A support web is described for roof foundation webs which comprises a spunbonded web of polyester filaments. The spunbonded web has a basis weight of 50 to 100 g/m.sup.2 and a filament denier of 1 to 8 dtex. It has been thermomechanically preconsolidated by means of a smooth calender and end-consolidated by means of a binder. This produces a high tear propagation resistance and nail removal resistance and good dimensional stability at high temperatures. The spunbonded web is therefore particularly suitable for use as a support web for bituminized roof foundation webs.

Support web for roof foundation webs

The invention relates to a nonwoven made of synthetic fibers or filaments for preparing roofing sheets by coating with fusible coating compositions. A nonwoven of this type is provided with a flame-retardant finish which is still inert at the processing temperatures of the coating composition (for example up to about 250.degree. C.) but which at higher temperatures forms a largely continuous, preferably foamlike, layer which in the event of a fire preferably remains in place even if the supporting fibers or filaments of the nonwoven melt away.

Nonwoven for manufacturing flameproof roofing sheets

A nonwoven which comprises fibers or filaments consolidated with a binder and which is suitable for use as a carrier web in roofing sheets which are resistant to jump fire and radiant heat is obtained by applying, together with the binder, solid particles which are resistant to heat and fire and whose spatial extension in at least one dimension is large compared with the effective hole size of the web layer. This size ratio ensures that the solid particles form a layer on the web which becomes firmly bonded to the fiber or filament web.

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Bobingen, Germany

Franz Kaulich