CA2022442A1 - Prefabricated acrylic sealing material and its application for sealing coverings and under-coverings - Google Patents
Prefabricated acrylic sealing material and its application for sealing coverings and under-coveringsInfo
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- CA2022442A1 CA2022442A1 CA 2022442 CA2022442A CA2022442A1 CA 2022442 A1 CA2022442 A1 CA 2022442A1 CA 2022442 CA2022442 CA 2022442 CA 2022442 A CA2022442 A CA 2022442A CA 2022442 A1 CA2022442 A1 CA 2022442A1
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- Prior art keywords
- layer
- acrylic
- binder
- material according
- coverings
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Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/04—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06N3/042—Acrylic polymers
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D5/00—Roof covering by making use of flexible material, e.g. supplied in roll form
- E04D5/10—Roof covering by making use of flexible material, e.g. supplied in roll form by making use of compounded or laminated materials, e.g. metal foils or plastic films coated with bitumen
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Textile Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
A B S T R A C T
A PREFABRICATED ACRYLIC SEALING MATERIAL AND ITS APPLICATION FOR
SEALING COVERINGS AND UNDER-COVERINGS
A multilayer prefabricated acrylic sealing material in the sheet form, including a textile support layer, a foam layer in an acrylic polymeric substance and a binder layer in an acrylic polymer material, characterized in that each layer is bonded to one at least of the two other layers in such manner that the foam layer is always in contact with the textile support layer, the thicknesses of the various layers of the multilayer sheet corresponding to surface masses of said layers ranging from 30 to 300 g/m2 for the textile support layer, from 10 to 100 g/m2 for the foam layer and from 50 to 2000 g/m2 for the binder layer.
A PREFABRICATED ACRYLIC SEALING MATERIAL AND ITS APPLICATION FOR
SEALING COVERINGS AND UNDER-COVERINGS
A multilayer prefabricated acrylic sealing material in the sheet form, including a textile support layer, a foam layer in an acrylic polymeric substance and a binder layer in an acrylic polymer material, characterized in that each layer is bonded to one at least of the two other layers in such manner that the foam layer is always in contact with the textile support layer, the thicknesses of the various layers of the multilayer sheet corresponding to surface masses of said layers ranging from 30 to 300 g/m2 for the textile support layer, from 10 to 100 g/m2 for the foam layer and from 50 to 2000 g/m2 for the binder layer.
Description
~ f`` '1 " 1 A ~3 A PREFABRICATED ACRYLIC SEALING MATERIAL AND ITS APPLICATION FOR
SEALING COVERINGS AND UNDER-COVERINGS
Field of the Invention -The invention relates to a multilayer prefabricated acrylic sealing material in the sheet form, and more particularly to the application of this material for sealing coverings ar.d under-coverings.
Background of the Invention Various multilayer prefabricated acrylic sealing materials in the sheet form have already been proposed for sealing coverings of buildings, and notably of platform roofs. Thus, patent FR-A-1 483 973 discloses a water-tight covering element consisting or a sheet made of a sealing plastic or elastic membrane laminated on a flexible sheet of open cell foam, said element being glued on the foam side by means of an appropriate glue on the support which has to be sealed. Patent FR-A-2 362 981 relates, amongst others, to an acrylic sealing material formed of a layer of a textile material coated on only one of its faces with a water-tight layer of an acrylic polymeric material, said sealing material being laid by glueing of the txtile side by means of an appropriate adhesive on the support which has to receive the sealing material, in such manner that a central portion of the textile layer is not impregnated, neither by the adhesive used for glueing nor by the acrylic polymeric substance of the water-tight layer.
An under-roofing material which resists impacts, which is water-tight and permeable to air and steam, for roofings in discrete elements such as tiles or slates overlapping each other, is also known (FR-A-2 467 934 and FR-A-2 517 726), said material being made of a non woven web of a polymeric substance such as polypropylene, polyethylene, polyester, vinyl polymer, coated in the hot state on one face (FR-A-2 467 934) or on both faces (FR-A-2 517 726) with a filler added bitumen (or asphalt) film in a quantity just sufficient for having a structure with microholes or microcracks when cooled down, opposing the passage of a liquid by capillarity but allowing the passage of air or steam.
In spite of their interesting performance, the multilayer prefabricated materials proposed either for sealing building coverings or also as materials for under-coverings or under-roofings still suffer from some deficiencies. In particular, the material disclosed in patent FR-A-1 483 973 has a small resistance to static punching, as determined according to standard NF P 84352, and moreover the foam open cells represent a major fault when there is a leak (sponge effect and accumulation of large quantities of water). For the bituminous material for under-roofings of patents FR-A-2 467 934 and FR-A-2 517 726, the well known sensitivity of bitumen to ultraviolets has for consequence that the covering has to be made without delay, the product also loosing part of its flexibility when the weather is cold.
Objects and Summary of the Invention The invention provides a prefabricated acrylic sealing material in the form of a multilayer sheet, which can be used for sealing coverings of buildings or as a material for under-coverings or under-roofings and which, in some of these applications, allow remedying the deficiencies of the sheet materials used till then.
The prefabricated acrylic sealing material according to the invention consists in a multilayer sheet including a textile support layer, a foam layer made of an acrylic polymeric substance and a binder layer of an acrylic polymeric material, and is characterized in that each layer is bonded to one at least of the two other layers in such manner that the foam layer is always in contact with the textile support layer, the thicknesses of the various layers corresponding to surface masses of these layers ranging from 30 to 300 g/m2 for the textile support layer, from 10 to 100 g/m2 for the foam layer and from 50 to 2000 g/m2 for the binder layer.
The textile support layer may consist of a woven web, or preferably a nonwoven web of natural or synthetic organic fibers, for example fibers in a polymeric material such as polypropylene, polyethylene, polyamide and notably aromatic polyamide, polyester, vinyl polymer or even inorganic fibers, for example glass fibers.
The acrylic polymeric material used for making the foam layer is based on at least one polymer chosen amongst the acrylic ester homopolymers, the acrylic ester copolymers between themselves and the copolymers of one of several acrylic esters with a minority quantity of one or several ethylenically unsaturated monomers such as the ethylenically unsaturated carboxylic acids and their anhydres, notably acrylic acid, methacrylic acid, maleic anhydride, cross-linking monomers such as the acrylic amides, for example acrylamide, methylolacrylamide, the vinyl aromatic monomers such as styrene, whereby said copolymers can be statistic copolymers, transplanted copolymers and even sequenced copolymers. The acrylic esters which are part of composition of the aforementioned copolymers are advantageously acrylates or alcoyl methacrylates, with the alcoyl radical in C1 to C18 and preferably in C2 to C8, notably ethyl, butyl, hexyl, ethyl-2-hexyl, and can carry possibly at least one active group, for example a hydroxyl or amino group.
The polymer material from which is formed the binder layer is based on at least one acrylic polymer chosen amongst the homopolymers and copolymers hereabove defined as likely to form the foam layer.
The polymer or polymers forming the polymer material of the binder layer can be identical or partly identical to the polymers forming the polymeric material of the foam layer, on on the contrary be different to the latter polymers.
In addition to its polymer component, each of the foam and binder layers can also include various additives, for example fillers such as kaolin or calcium carbonate, pigments, dyes, flame retardants, wetting agents, fungicides, aligicides, said additives being associated with the polymer component of the layer in consideration, in quantities corresponding to those usually advocated for their use.
Advantageously, the binder layer of the multilayer sheet forming the sealing material includes a few per cent, for example from 2 to 5 per cent by weight of a granular filler, notably glass, silicate or calcium carbonate microballs, the size of the grains of which ranges ~? ' ` ' . ~ i3 ~'~
~, J~ !,J ~
from about 150 ~m to 600 ~m, which allows imparting a microrugosity to the binder layer surface.
According to a first embodiment, the sealing material according to the invention has its foam layer interposed between its textile support layer and its binder layer, the thicknesses of said layers corresponding to surface masses ranging from 30 to 300 mg/m2 for the textile support layer, from 10 to 100 g/m2 for the foam layer and from 1000 to 2000 g/m2 for the binder layer. In particular, in this first embodiment, the foam layer has a cellular gradient from the textile layer to the binder layer, meaning that it possesses a number of cells which decreases from the textile layer when getting nearer to the binder layer in order to form, in contact with said binder layer, a continuous and closed surface. The multilayer sheet sealing material obtained according to the aforementioned embodiment is usable for sealing coverings, notably platform roofs, such a material being totally water-tight, having a good behaviour to ultraviolets, an excellent behaviour at high temperatures (in particular no flow up to about 120-130C) and a good flexibility at low temperature (no breakage when bent on a mandrel having a diameter of 10 mm at -35C). The laying of said sealing material on the support for receiving it is carried out by glueing, with the textile side of the material facing the support, by means of any appropriate glue, for example an acrylic glue in aqueous dispersion or in the form of a solution in a solvent, after overlapping the free edge of a sheet which has just been laid by about 10 cm on the adjacent sheet which is being laid.
In order to improve the interdependence of the adjacent sealing sheets during the abovementioned laying operation, a marginal zone of the textile support layer which extends along a longitudinal edge of the sealing sheet can be substituted by a layer of substantially equal thickness of a thermally activable adhesive, for example a hot melt adhesive, the width of said zone being for example of 5 to 10 cm. When providing the tightness of a covering, the connection between two adjacent sealing sheets is then carried out by overlapping the two longitudinal free edge of the sealing sheet which has just been laid with the thermally activable adhesive zone of the textile support layer of the sealing sheet which is being la:id, once the adhesive of said zone has been activated by heat.
According to a second embodiment of the sealing material according to the invention, the thicknesses of the layers forming the multilayer sheet correspond to surface masses ranging from 30 to 300 g/m2 for the textile support layer, from 10 to 100 g/m2 for the foam layer and from 50 to 500 g/m2 for the binder layer, said layers being disposed in such manner that the foam layer is interposed between the textile support layer and the binder layer, or that the textile support layer is interposed between the foam layer and the binder layer.
The sealing material obtained according to the second embodiment can be used as a material for under-coverings (under-roofings), such a material being perfectly water-tight under a pressure of 1500 Pa and having a large permeance to water steam (at least 100 g/m2 and for 24 hours according to standard NF T 30-018), with a good behaviour to natural ageing and a good resistance to W s, resisting to the fall of objects or persons and offering, if desired, an anti-sliding surface.
The sealing sheets forming the under-roofing or under-covering material are placed between the support of the tiles or slates and the framework, with the binder layer side opposite the tiles or slates, ln such manner that their longitudinal edges is substantially oriented along the line of greatest slope of the roofing and that the free longitudinal ed8e of the sheet which has thus been laid is overlapped by about 10 to 20 cm of the textile support layer or of the foam layer, according to case, of the adjacent sheet which is being laid.
The multilayer sheet sealing material according to the invention can be made by any method allowing providing a sheet having a three-layer structure which is characteristic of the invention.
Advantageously, the sheet according to the invention is produced by 2 coating technique used in a traditional manner and including a coating of the textile support chosen by means of a precursor of the foam layer, said precursor consisting in a drying operation of the foam layer, then of a coating, according to case3 of the free surface of the dried foam layer of the free surface of the textile support layer by means of a precursor of the foam layer, said precursor being made of an L~ . r~
acrylic composition in an aqueous dispersion, and finally a drying of the binder layer.
The formation of the thermally activable adhesive marginal zone along a longitudinal edge of the textile support layer of the sealing S sheet can be obtained by abrasion of the textile sheet and by extrusion of the adhesive on the site thus formed by abrasion of the textile.
The foamed acrylic composition in an aqueous dispersion which forms the precursor of the foam layer is prepared, in a conventional manner, by first preparing an aqueous dispersion of the ingredients, meaning the acrylic polymeric material and the various additives, chosen as to form the composition, then by subjecting this dispersion to a sufficient mechanical agitation so as to bring said dispersion in the foam form~
Likewise, the aqueous dispersion of the acrylic binder, forming the precursor of the binder layer, is obtained by the traditional dispersion techniques in an aqueous phase, of the ingredients, meaning the acrylic polymeric material and the various additives, chosen for forming the acrylic binder.
The various operations, viz. dispersion, coating, drying, abrasion of the textile layer, extrusion of the thermally activable adhesive, which are found in the preparation of the sealing sheet can be carried out by using the various devices known to this effect.
Detailed Description of some embodiments The invention is illustrated by the following examples which are non limiting.
Example 1 Two series A and B of sealing sheets according to the invention and usable as under-roofing material have been prepared by coating.
Series A:
The sealing sheets of this series were made of a nonwoven web of polypropylene fibers having a surface mass equal to 110 g/m2, coated on one face with an acrylic foam layer based on an ethyl acrylate terpolymer. an acrylic acid and N-methylolacrylamide, said foam layer having a surface mass of 50 g/m2 and being coated on its other face with a layer of acrylic binder based on an ethyl acrylate and methyl methacrylate copolymer and filled, according to case, from 2 to 5 per cent by weight of the binder, with glass or silicate microspheres having a diameter of about 300 ~m, said binder layer having a surface mass of 300 g/m2.
Series ~:
The sealing sheets of this series were made of a nonwoven web of polyester fibers having a surface mass of 130 g/m2 coated on one face with an acrylic foam based on the terpolymer used for preparing the sheets of Series A, said foam layer having a surface mass of 20 g/m2 and being coated in turn with a layer of acrylic binder based on an ethyl acrylate and methyl methacrylate copolymer and filled, according to case, with 2 to 5 per cent by weight of the binder, with calcium carbonate grains having a size grading from 200 to 500 ~m, said binder layer having a surface mass of 300 g/m2.
The sealing sheets thus produced were totally water-tight under a pressure of 1500 Pa and had a permeance to steam, according to NF T
30-018, of about 100 to 110 g/m2 and for 24 hours. ~oreover, they had a good behaviour to UV and a good fire resistance, and they also offered a satisfacotry anti-slide surface (free surface of the binder layer).
Ex~mple 2 Two series C and D of sealing sheets according to the invention, usable for sealing coverings (platform roofs), have been prepared by coating.
Series C
The sealing sheet of this series were made of a nonwoven web of polyester fibers having a surface mass of 150 g/m2 coated on one face with an acrylic layer based on the terpolymer used in Example 1, said foam layer having a surface mass of 50 g/m2 and being coated in turn with a layer of an acrylic binder based on a butyl acrylate and methyl methacrylate copolymer mixed with a butyl acrylate and styrene copolymer with 20 per cent by weight of styrene and filled, according to case, with 2 to 5 per cent by weight of binder, glass or silicate microspheres with a diameter of about 300 ~m, said binder layer having ~ . ~ ., , c a a surface mass of 1700 g/m2.
Series D
The sealing sheets of this series were made of a nonwoven web of polypropylene fibers having a surface mass of 136 g/m2 coated on one S face with a layer of an acrylic foam based on the terpolymer used in Example 1, said foam layer having a surface mass of 20 g/m2 and being coated in turn with a layer of thermally cross-linked acrylic binder based on a butyl acrylate, methyl methacrylate and N-methylolacrylamide terpolymer, said binder layer having a surface mass of 1700 g/m2. Each sheet carried also a coating of a hot melt adhesive on a marginal zone of 5 to 10 cm formed by abrasion of the nonwoven layer along a longitudinal edge of the sheet, this zone provided with the holt melt adhesive being intended for making easier the junceion of adjacent sealing sheets (breadth to breadth junction).
The covering sealing sheet of Series C and D are totally water-tight under a pressure of 0.6 ~Pa. ~oreover, they have an excellent behaviour to UVs, a good behaviour to flowing (flowing temperature over 120C) and a good flexibility at a low temperature (no breakage when folded on a mandrel with a diameter of 10 mm at -35C). ~oreover, the sheets of Series C which include a surface granular filler of the binder layer also offer a satisfactory anti-sliding surface.
Of course, the invention is not limited to the embodiments described, and it encompasses all the various variants thereof which may be defined by those skilled in the art and which are within the scope of the invention.
SEALING COVERINGS AND UNDER-COVERINGS
Field of the Invention -The invention relates to a multilayer prefabricated acrylic sealing material in the sheet form, and more particularly to the application of this material for sealing coverings ar.d under-coverings.
Background of the Invention Various multilayer prefabricated acrylic sealing materials in the sheet form have already been proposed for sealing coverings of buildings, and notably of platform roofs. Thus, patent FR-A-1 483 973 discloses a water-tight covering element consisting or a sheet made of a sealing plastic or elastic membrane laminated on a flexible sheet of open cell foam, said element being glued on the foam side by means of an appropriate glue on the support which has to be sealed. Patent FR-A-2 362 981 relates, amongst others, to an acrylic sealing material formed of a layer of a textile material coated on only one of its faces with a water-tight layer of an acrylic polymeric material, said sealing material being laid by glueing of the txtile side by means of an appropriate adhesive on the support which has to receive the sealing material, in such manner that a central portion of the textile layer is not impregnated, neither by the adhesive used for glueing nor by the acrylic polymeric substance of the water-tight layer.
An under-roofing material which resists impacts, which is water-tight and permeable to air and steam, for roofings in discrete elements such as tiles or slates overlapping each other, is also known (FR-A-2 467 934 and FR-A-2 517 726), said material being made of a non woven web of a polymeric substance such as polypropylene, polyethylene, polyester, vinyl polymer, coated in the hot state on one face (FR-A-2 467 934) or on both faces (FR-A-2 517 726) with a filler added bitumen (or asphalt) film in a quantity just sufficient for having a structure with microholes or microcracks when cooled down, opposing the passage of a liquid by capillarity but allowing the passage of air or steam.
In spite of their interesting performance, the multilayer prefabricated materials proposed either for sealing building coverings or also as materials for under-coverings or under-roofings still suffer from some deficiencies. In particular, the material disclosed in patent FR-A-1 483 973 has a small resistance to static punching, as determined according to standard NF P 84352, and moreover the foam open cells represent a major fault when there is a leak (sponge effect and accumulation of large quantities of water). For the bituminous material for under-roofings of patents FR-A-2 467 934 and FR-A-2 517 726, the well known sensitivity of bitumen to ultraviolets has for consequence that the covering has to be made without delay, the product also loosing part of its flexibility when the weather is cold.
Objects and Summary of the Invention The invention provides a prefabricated acrylic sealing material in the form of a multilayer sheet, which can be used for sealing coverings of buildings or as a material for under-coverings or under-roofings and which, in some of these applications, allow remedying the deficiencies of the sheet materials used till then.
The prefabricated acrylic sealing material according to the invention consists in a multilayer sheet including a textile support layer, a foam layer made of an acrylic polymeric substance and a binder layer of an acrylic polymeric material, and is characterized in that each layer is bonded to one at least of the two other layers in such manner that the foam layer is always in contact with the textile support layer, the thicknesses of the various layers corresponding to surface masses of these layers ranging from 30 to 300 g/m2 for the textile support layer, from 10 to 100 g/m2 for the foam layer and from 50 to 2000 g/m2 for the binder layer.
The textile support layer may consist of a woven web, or preferably a nonwoven web of natural or synthetic organic fibers, for example fibers in a polymeric material such as polypropylene, polyethylene, polyamide and notably aromatic polyamide, polyester, vinyl polymer or even inorganic fibers, for example glass fibers.
The acrylic polymeric material used for making the foam layer is based on at least one polymer chosen amongst the acrylic ester homopolymers, the acrylic ester copolymers between themselves and the copolymers of one of several acrylic esters with a minority quantity of one or several ethylenically unsaturated monomers such as the ethylenically unsaturated carboxylic acids and their anhydres, notably acrylic acid, methacrylic acid, maleic anhydride, cross-linking monomers such as the acrylic amides, for example acrylamide, methylolacrylamide, the vinyl aromatic monomers such as styrene, whereby said copolymers can be statistic copolymers, transplanted copolymers and even sequenced copolymers. The acrylic esters which are part of composition of the aforementioned copolymers are advantageously acrylates or alcoyl methacrylates, with the alcoyl radical in C1 to C18 and preferably in C2 to C8, notably ethyl, butyl, hexyl, ethyl-2-hexyl, and can carry possibly at least one active group, for example a hydroxyl or amino group.
The polymer material from which is formed the binder layer is based on at least one acrylic polymer chosen amongst the homopolymers and copolymers hereabove defined as likely to form the foam layer.
The polymer or polymers forming the polymer material of the binder layer can be identical or partly identical to the polymers forming the polymeric material of the foam layer, on on the contrary be different to the latter polymers.
In addition to its polymer component, each of the foam and binder layers can also include various additives, for example fillers such as kaolin or calcium carbonate, pigments, dyes, flame retardants, wetting agents, fungicides, aligicides, said additives being associated with the polymer component of the layer in consideration, in quantities corresponding to those usually advocated for their use.
Advantageously, the binder layer of the multilayer sheet forming the sealing material includes a few per cent, for example from 2 to 5 per cent by weight of a granular filler, notably glass, silicate or calcium carbonate microballs, the size of the grains of which ranges ~? ' ` ' . ~ i3 ~'~
~, J~ !,J ~
from about 150 ~m to 600 ~m, which allows imparting a microrugosity to the binder layer surface.
According to a first embodiment, the sealing material according to the invention has its foam layer interposed between its textile support layer and its binder layer, the thicknesses of said layers corresponding to surface masses ranging from 30 to 300 mg/m2 for the textile support layer, from 10 to 100 g/m2 for the foam layer and from 1000 to 2000 g/m2 for the binder layer. In particular, in this first embodiment, the foam layer has a cellular gradient from the textile layer to the binder layer, meaning that it possesses a number of cells which decreases from the textile layer when getting nearer to the binder layer in order to form, in contact with said binder layer, a continuous and closed surface. The multilayer sheet sealing material obtained according to the aforementioned embodiment is usable for sealing coverings, notably platform roofs, such a material being totally water-tight, having a good behaviour to ultraviolets, an excellent behaviour at high temperatures (in particular no flow up to about 120-130C) and a good flexibility at low temperature (no breakage when bent on a mandrel having a diameter of 10 mm at -35C). The laying of said sealing material on the support for receiving it is carried out by glueing, with the textile side of the material facing the support, by means of any appropriate glue, for example an acrylic glue in aqueous dispersion or in the form of a solution in a solvent, after overlapping the free edge of a sheet which has just been laid by about 10 cm on the adjacent sheet which is being laid.
In order to improve the interdependence of the adjacent sealing sheets during the abovementioned laying operation, a marginal zone of the textile support layer which extends along a longitudinal edge of the sealing sheet can be substituted by a layer of substantially equal thickness of a thermally activable adhesive, for example a hot melt adhesive, the width of said zone being for example of 5 to 10 cm. When providing the tightness of a covering, the connection between two adjacent sealing sheets is then carried out by overlapping the two longitudinal free edge of the sealing sheet which has just been laid with the thermally activable adhesive zone of the textile support layer of the sealing sheet which is being la:id, once the adhesive of said zone has been activated by heat.
According to a second embodiment of the sealing material according to the invention, the thicknesses of the layers forming the multilayer sheet correspond to surface masses ranging from 30 to 300 g/m2 for the textile support layer, from 10 to 100 g/m2 for the foam layer and from 50 to 500 g/m2 for the binder layer, said layers being disposed in such manner that the foam layer is interposed between the textile support layer and the binder layer, or that the textile support layer is interposed between the foam layer and the binder layer.
The sealing material obtained according to the second embodiment can be used as a material for under-coverings (under-roofings), such a material being perfectly water-tight under a pressure of 1500 Pa and having a large permeance to water steam (at least 100 g/m2 and for 24 hours according to standard NF T 30-018), with a good behaviour to natural ageing and a good resistance to W s, resisting to the fall of objects or persons and offering, if desired, an anti-sliding surface.
The sealing sheets forming the under-roofing or under-covering material are placed between the support of the tiles or slates and the framework, with the binder layer side opposite the tiles or slates, ln such manner that their longitudinal edges is substantially oriented along the line of greatest slope of the roofing and that the free longitudinal ed8e of the sheet which has thus been laid is overlapped by about 10 to 20 cm of the textile support layer or of the foam layer, according to case, of the adjacent sheet which is being laid.
The multilayer sheet sealing material according to the invention can be made by any method allowing providing a sheet having a three-layer structure which is characteristic of the invention.
Advantageously, the sheet according to the invention is produced by 2 coating technique used in a traditional manner and including a coating of the textile support chosen by means of a precursor of the foam layer, said precursor consisting in a drying operation of the foam layer, then of a coating, according to case3 of the free surface of the dried foam layer of the free surface of the textile support layer by means of a precursor of the foam layer, said precursor being made of an L~ . r~
acrylic composition in an aqueous dispersion, and finally a drying of the binder layer.
The formation of the thermally activable adhesive marginal zone along a longitudinal edge of the textile support layer of the sealing S sheet can be obtained by abrasion of the textile sheet and by extrusion of the adhesive on the site thus formed by abrasion of the textile.
The foamed acrylic composition in an aqueous dispersion which forms the precursor of the foam layer is prepared, in a conventional manner, by first preparing an aqueous dispersion of the ingredients, meaning the acrylic polymeric material and the various additives, chosen as to form the composition, then by subjecting this dispersion to a sufficient mechanical agitation so as to bring said dispersion in the foam form~
Likewise, the aqueous dispersion of the acrylic binder, forming the precursor of the binder layer, is obtained by the traditional dispersion techniques in an aqueous phase, of the ingredients, meaning the acrylic polymeric material and the various additives, chosen for forming the acrylic binder.
The various operations, viz. dispersion, coating, drying, abrasion of the textile layer, extrusion of the thermally activable adhesive, which are found in the preparation of the sealing sheet can be carried out by using the various devices known to this effect.
Detailed Description of some embodiments The invention is illustrated by the following examples which are non limiting.
Example 1 Two series A and B of sealing sheets according to the invention and usable as under-roofing material have been prepared by coating.
Series A:
The sealing sheets of this series were made of a nonwoven web of polypropylene fibers having a surface mass equal to 110 g/m2, coated on one face with an acrylic foam layer based on an ethyl acrylate terpolymer. an acrylic acid and N-methylolacrylamide, said foam layer having a surface mass of 50 g/m2 and being coated on its other face with a layer of acrylic binder based on an ethyl acrylate and methyl methacrylate copolymer and filled, according to case, from 2 to 5 per cent by weight of the binder, with glass or silicate microspheres having a diameter of about 300 ~m, said binder layer having a surface mass of 300 g/m2.
Series ~:
The sealing sheets of this series were made of a nonwoven web of polyester fibers having a surface mass of 130 g/m2 coated on one face with an acrylic foam based on the terpolymer used for preparing the sheets of Series A, said foam layer having a surface mass of 20 g/m2 and being coated in turn with a layer of acrylic binder based on an ethyl acrylate and methyl methacrylate copolymer and filled, according to case, with 2 to 5 per cent by weight of the binder, with calcium carbonate grains having a size grading from 200 to 500 ~m, said binder layer having a surface mass of 300 g/m2.
The sealing sheets thus produced were totally water-tight under a pressure of 1500 Pa and had a permeance to steam, according to NF T
30-018, of about 100 to 110 g/m2 and for 24 hours. ~oreover, they had a good behaviour to UV and a good fire resistance, and they also offered a satisfacotry anti-slide surface (free surface of the binder layer).
Ex~mple 2 Two series C and D of sealing sheets according to the invention, usable for sealing coverings (platform roofs), have been prepared by coating.
Series C
The sealing sheet of this series were made of a nonwoven web of polyester fibers having a surface mass of 150 g/m2 coated on one face with an acrylic layer based on the terpolymer used in Example 1, said foam layer having a surface mass of 50 g/m2 and being coated in turn with a layer of an acrylic binder based on a butyl acrylate and methyl methacrylate copolymer mixed with a butyl acrylate and styrene copolymer with 20 per cent by weight of styrene and filled, according to case, with 2 to 5 per cent by weight of binder, glass or silicate microspheres with a diameter of about 300 ~m, said binder layer having ~ . ~ ., , c a a surface mass of 1700 g/m2.
Series D
The sealing sheets of this series were made of a nonwoven web of polypropylene fibers having a surface mass of 136 g/m2 coated on one S face with a layer of an acrylic foam based on the terpolymer used in Example 1, said foam layer having a surface mass of 20 g/m2 and being coated in turn with a layer of thermally cross-linked acrylic binder based on a butyl acrylate, methyl methacrylate and N-methylolacrylamide terpolymer, said binder layer having a surface mass of 1700 g/m2. Each sheet carried also a coating of a hot melt adhesive on a marginal zone of 5 to 10 cm formed by abrasion of the nonwoven layer along a longitudinal edge of the sheet, this zone provided with the holt melt adhesive being intended for making easier the junceion of adjacent sealing sheets (breadth to breadth junction).
The covering sealing sheet of Series C and D are totally water-tight under a pressure of 0.6 ~Pa. ~oreover, they have an excellent behaviour to UVs, a good behaviour to flowing (flowing temperature over 120C) and a good flexibility at a low temperature (no breakage when folded on a mandrel with a diameter of 10 mm at -35C). ~oreover, the sheets of Series C which include a surface granular filler of the binder layer also offer a satisfactory anti-sliding surface.
Of course, the invention is not limited to the embodiments described, and it encompasses all the various variants thereof which may be defined by those skilled in the art and which are within the scope of the invention.
Claims (13)
1. A multilayer prefabricated acrylic sealing material in the sheet form, including a textile support layer, a foam layer made of an acrylic polymeric substance and a binder layer of an acrylic polymeric material, characterized in that each layer is bonded to one at least of the two other layers in such manner that the foam layer is always in contact with the textile support layer, the thicknesses of the various layers corresponding to surface masses of these layers ranging from 30 to 300 g/m2 for the textile support layer, from 10 to 100 g/m2 for the foam layer and from 50 to 2000 g/m2 for the binder layer.
2. A material according to claim 1, characterized in that it consists of a woven web, or preferably a nonwoven web of natural or synthetic organic fibers, for example fibers in a polymeric material such as polypropylene, polyethylene, polyamide and notably aromatic polyamide, polyester, vinyl polymer or even inorganic fibers, for example glass fibers.
3. A material according to one of claims 1 and 2, characterized in that the acrylic polymeric substance used for making the foam layer and the binder layer polymeric material are each based on at least one polymer chosen amongst the acrylic ester homopolymers, the acrylic ester copolymers between themselves and the copolymers of one of several acrylic esters with a minority quantity of one or several monomers ethylenically unsaturated such as the ethylenically unsaturated carboxylic acids and their anhydrids, notably acrylic acid, methacrylic acid, maleic anhydrid, cross-linking monomers, notably acrylamide, mehylolacrylamide, and the vinyl aromatic monomers such as styrene.
4. A material according to claim 3, characterized in that the acrylic esters which are part of the homopolymers and copolymers composition are chosen amongst alcoyl acrylates or methacrylates, whose alcoyl radical is in C1 to C18 and preferably in C2 to C8, and can carry possibly at least one active group, for example a hydroxyl or amino group.
5. A material according to any one of claims 1 through 4, characterized in that, in addition to its polymer component, each of the foam and binder layers includes various additives, notably fillers, pigments, dyes, wetting agents, fungicides, aligicides and flame retardants.
6. A material according to any one of claims 1 through 5, characterized in that the binder layer of the multilayer sheet includes a few per cent, notably from 2 to 5 per cent by weight of a granular filler, for example glass, silicate or calcium carbonate microballs, the size of the grains of which ranging from about 150 mm to 600 mm, in order to impart a micro-rugosity to the filler surface.
7. A material according to any one of claims 1 through 6, characterized in that the foam layer is interposed between the textile support layer and the binder layer, and in that the thicknesses of said layers correspond to surface masses ranging from 30 to 300 mg/m2 for the textile support layer, from 10 to 100 g/m2 for the foam layer and from 1000 to 2000 g/m2 for the binder layer.
8. A material according to claim 7, characterized in that the foam layer has a cellular gradient from the textile layer to the binder layer, meaning that it possesses a number of cells which decreases from the textile layer when getting nearer to the binder layer in order to form, in contact with said binder layer, a continuous and closed surface.
9. A material according to one of claims 7 or 8, characterized in that a marginal zone of the textile support layer which extends along a longitudinal edge of the sealing sheet is substituted by a layer of substantially equal thickness of a thermally activable adhesive.
10. A material according to any one of claims 1 through 6, characterized in that the thicknesses of the layers forming the multilayer layer correspond to surface masses of such layers ranging from 30 to 300 g/m2 for the textile support layer, from 10 to 100 g/m2 for the foam layer and from 50 to 500 g/m2 for the binder layer, said layers being disposed in such manner that the foam layer is interposed between the textile support layer and the binder layer, or that the textile support layer is interposed between the foam layer and the binder layer.
11. Application of the material according to any one of claims 1 through 10 for sealing coverings or under-coverings.
12. Application according to claim 11, wherein the sealing of coverings is provided by using the material according to one of claims 8 through 9.
13. Application according to claim 11, wherein the material according to claim 10 is used as material for under-coverings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8910599A FR2650615B1 (en) | 1989-08-07 | 1989-08-07 | PREFABRICATED ACRYLIC WATERPROOFING MATERIAL AND ITS APPLICATION IN WATERPROOFING OF COVERS AND UNDERCOVERS |
| FR8910599 | 1989-08-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2022442A1 true CA2022442A1 (en) | 1991-02-08 |
Family
ID=9384527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2022442 Abandoned CA2022442A1 (en) | 1989-08-07 | 1990-08-01 | Prefabricated acrylic sealing material and its application for sealing coverings and under-coverings |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0412889B1 (en) |
| CA (1) | CA2022442A1 (en) |
| DE (2) | DE69005560T2 (en) |
| ES (1) | ES2020161A4 (en) |
| FR (1) | FR2650615B1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2691994B1 (en) * | 1992-06-04 | 1994-09-02 | Smac Acieroid | Waterproofing coating for roofs based on polyisocyanates and glass reinforcement and its manufacturing process. |
| GB9906081D0 (en) * | 1999-03-18 | 1999-05-12 | Ultraframe Uk Ltd | Weatherproofing |
| RU2482967C1 (en) * | 2011-10-18 | 2013-05-27 | Российская Федерация, От Имени Которой Выступает Министерство Промышленности И Торговли Российской Федерации | Laminar combined material |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3455076A (en) * | 1967-08-01 | 1969-07-15 | Johns Manville | Roofing membrane with fibrous reinforcing material |
| DE1619296A1 (en) * | 1967-11-17 | 1970-12-03 | Schroer Jun Dachpappenfabrik B | Plastic-coated roofing membranes and processes for their manufacture |
| BE788553A (en) * | 1971-09-11 | 1973-01-02 | Dynamit Nobel Ag | PROCESS FOR MAKING A HARD COVER FOR A HEAT-INSULATED ROOF |
| US4100325A (en) * | 1976-12-13 | 1978-07-11 | The B. F. Goodrich Company | Weather resistant composites |
| JPS5424425A (en) * | 1977-07-26 | 1979-02-23 | Tajima Roofing Co | Rainnproof sheet |
-
1989
- 1989-08-07 FR FR8910599A patent/FR2650615B1/en not_active Expired - Fee Related
-
1990
- 1990-08-01 CA CA 2022442 patent/CA2022442A1/en not_active Abandoned
- 1990-08-03 DE DE1990605560 patent/DE69005560T2/en not_active Expired - Fee Related
- 1990-08-03 EP EP19900402240 patent/EP0412889B1/en not_active Expired - Lifetime
- 1990-08-03 ES ES90402240T patent/ES2020161A4/en active Pending
- 1990-08-03 DE DE1990402240 patent/DE412889T1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0412889A1 (en) | 1991-02-13 |
| ES2020161A4 (en) | 1991-08-01 |
| FR2650615B1 (en) | 1991-10-11 |
| DE69005560D1 (en) | 1994-02-10 |
| EP0412889B1 (en) | 1993-12-29 |
| DE69005560T2 (en) | 1994-05-11 |
| FR2650615A1 (en) | 1991-02-08 |
| DE412889T1 (en) | 1991-07-04 |
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| Date | Code | Title | Description |
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| FZDE | Dead |