DE7004790U - FOIL FOR BUILDING PURPOSES, IN PARTICULAR ROOF FILM. - Google Patents

Description

Annex to the utility model registration

from IO.2.I97O

Be / where

Foil for building purposes, in particular roofing membrane

The present invention relates to a film for building purposes based on bituminous polyethylene or bitumen * Containing polyethylene copolymer, which is suitable, among other things, in the form of extruded sheets for roofing and on which a second layer of a plastic or natural resin is applied.

These bituminous polyethylene films are very well suited for construction purposes, especially for roof coverings, however, have the disadvantage that they form a sticky coating on the surface, which their storage, their Transport, their further processing and handling are very difficult. The sticky coating not only occurs when extruding the film in appearance, but already with the delivered granulate. The sticky that forms on the film Layer can cause the film to stick together, so that the bonded web does not or only with great difficulty can be rolled up. The processing of the foil, walking on the foil when laying, etc. is through makes this bonding difficult.

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Attempts have therefore already been made to treat the surface of the film with a finely powdered agent. According to this process, the surface of the film is sprinkled with powdery substances, so that the adhesive properties on the surface of the film are reduced. Despite this reduction in the adhesive properties, it has been found that apparently adhesive- like substances, for example oil or oil-like substances, can also be exuded from the film afterwards and the phenomenon of sticking can be observed.

Attempts were also made to improve the adhesive properties of the surface of the film by incorporating a larger amount decrease of fillers. However, with this method there is the risk that by incorporating a larger The amount of fillers adversely affects the physical properties of the film, e.g. tensile strength will. Finally, attempts have been made to improve the adhesive properties of the film by laminating an approximately equally strong film To prevent polytetrafluoroethylene film. However, this increases the cost of the film considerably.

The aim and object of the present invention was to develop a film for building purposes, in particular roofing film, in the a very thin layer already has the undesirable adhesive properties be eliminated. Another object of the invention is to reduce the undesirable adhesive properties of the film

to turn off on most of the area, however on an edge or edge part or on several edges or edge parts, in particular on those edge parts that are used for Overlapping, gluing, etc. are used to maintain.

Finally, through the content of the additives of the second layer, in particular by reducing or eliminating the plasticizer content, the effect of the applied second very thin layer in terms of reduction or abolition of the unwanted adhesive conditions can be.

According to the invention, it has been found that these aims and objectives are achieved by using a film made of a bituminous polyethylene or bituminous polyethylene copolymer film with a thickness of about 1 -5 mm, preferably 1.5-2 mm, and a second layer of 10 / U - 1 ram, preferably 20 / U - 200 λχ thickness, of a plastic or natural resin that absorbs oils or oily substances or prevents exudation.

This applied second thin layer should, due to its chemical nature, be able to prevent the oily leaking To bind sticky components in the manner of a plasticization or to prevent their escape. The angry according to a particularly advantageous embodiment, the second layer

Guide form low in plasticizer, preferably free from plasticizer. To achieve further effects, the layers can be used the film can also contain additives known per se - white, colored or metal pigments and the like.

According to a particularly advantageous embodiment, the carries bituminous polyethylene or polyethylene copolymer film not the second layer on its entire surface, but is preferably at one edge or edge part or at several edges or edge parts of the second layer not covered.

Particular advantages were obtained at a heavily bitumenhaltlgen ethylene-acrylate Mischpolymerisatfolie with a layer of plastic on the basis of a styrene-acrylate copolymer or a polyvinyl ester or a natural resin ..erden ^T with regard to the prevention of unwanted adhesive properties.

In the attached drawing, the bitumen content is under Ί) Polyethylene film shown schematically with a thin layer (2) of an oil or oil-like substance synthetic resin that prevents exudation.

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Claims (4)

. 5 claims for protection; 1. Film for construction purposes, especially roofing film, characterized in that the film consists of an oa. 1-5 mm * preferably 1.5-2 mm thick bituminous polyethylene or bituminous polyethylene copolymer film and a second layer of 10 / U 1 mm, preferably 20 / U i- 200 / U thickness of an oil or oil-like substance applied over it absorbing or exudation preventing plastic or natural resin. 2. film for building purposes, in particular roofing film, according to claim 1, characterized in that the second layer is low in plasticizer, preferably free of plasticizer. 3. Film for building purposes, in particular roofing film, according to claims 1 and 2, characterized in that the bituminous polyethylene or Polyäthylemnisehpolymerisatfolie does not carry the second layer over its entire surface and preferably at an edge or edge part or is not covered by the second layer at several edges or edge parts. -r 6 - I> I Il -: t 4. foil for building purposes, in particular I> .otifolie, aach Att "sayings 1-5, characterized in that ethylene-containing Aciylat-mBchpolynieri.eiitfoliiS layer of a synthetic Stoffee on the lüitfie of acrylate or polyvinyl Mlschpolymerlsat or polymers of this compound, or a Natvrhar * is covered as a second layer. DEUTSCHE SOLVAY-WERKE limited company