EP3262121A1 - Roofing membrane and process for producing the roofing membrane - Google Patents
Roofing membrane and process for producing the roofing membraneInfo
- Publication number
- EP3262121A1 EP3262121A1 EP16703111.1A EP16703111A EP3262121A1 EP 3262121 A1 EP3262121 A1 EP 3262121A1 EP 16703111 A EP16703111 A EP 16703111A EP 3262121 A1 EP3262121 A1 EP 3262121A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tpu
- roofing membrane
- tpee
- pbw
- barrier film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title description 6
- 230000008569 process Effects 0.000 title description 6
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims abstract description 40
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims abstract description 40
- 230000004888 barrier function Effects 0.000 claims abstract description 36
- 239000000203 mixture Substances 0.000 claims abstract description 29
- 150000002148 esters Chemical class 0.000 claims abstract description 25
- 229920000642 polymer Polymers 0.000 claims abstract description 21
- 229920000570 polyether Polymers 0.000 claims abstract description 7
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 5
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 5
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 5
- 239000000654 additive Substances 0.000 claims description 2
- -1 alkylene diol Chemical class 0.000 description 20
- 150000002009 diols Chemical class 0.000 description 14
- 238000001125 extrusion Methods 0.000 description 12
- 239000004594 Masterbatch (MB) Substances 0.000 description 7
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- 230000006750 UV protection Effects 0.000 description 5
- 239000012963 UV stabilizer Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000006085 branching agent Substances 0.000 description 4
- 150000004985 diamines Chemical class 0.000 description 4
- 125000005442 diisocyanate group Chemical group 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 150000001991 dicarboxylic acids Chemical class 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920001451 polypropylene glycol Polymers 0.000 description 3
- 229920000909 polytetrahydrofuran Polymers 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- 125000001931 aliphatic group Chemical group 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 229920006351 engineering plastic Polymers 0.000 description 2
- 238000007765 extrusion coating Methods 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- ARCGXLSVLAOJQL-UHFFFAOYSA-N trimellitic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C(C(O)=O)=C1 ARCGXLSVLAOJQL-UHFFFAOYSA-N 0.000 description 2
- WSQZNZLOZXSBHA-UHFFFAOYSA-N 3,8-dioxabicyclo[8.2.2]tetradeca-1(12),10,13-triene-2,9-dione Chemical compound O=C1OCCCCOC(=O)C2=CC=C1C=C2 WSQZNZLOZXSBHA-UHFFFAOYSA-N 0.000 description 1
- NEQFBGHQPUXOFH-UHFFFAOYSA-N 4-(4-carboxyphenyl)benzoic acid Chemical compound C1=CC(C(=O)O)=CC=C1C1=CC=C(C(O)=O)C=C1 NEQFBGHQPUXOFH-UHFFFAOYSA-N 0.000 description 1
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical compound C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 description 1
- SFHBJXIEBWOOFA-UHFFFAOYSA-N 5-methyl-3,6-dioxabicyclo[6.2.2]dodeca-1(10),8,11-triene-2,7-dione Chemical compound O=C1OC(C)COC(=O)C2=CC=C1C=C2 SFHBJXIEBWOOFA-UHFFFAOYSA-N 0.000 description 1
- 229920010784 Arnitel® EM400 Polymers 0.000 description 1
- 239000004970 Chain extender Substances 0.000 description 1
- 229920001634 Copolyester Polymers 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000036449 good health Effects 0.000 description 1
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- RXOHFPCZGPKIRD-UHFFFAOYSA-N naphthalene-2,6-dicarboxylic acid Chemical compound C1=C(C(O)=O)C=CC2=CC(C(=O)O)=CC=C21 RXOHFPCZGPKIRD-UHFFFAOYSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000233 poly(alkylene oxides) Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- SRPWOOOHEPICQU-UHFFFAOYSA-N trimellitic anhydride Chemical compound OC(=O)C1=CC=C2C(=O)OC(=O)C2=C1 SRPWOOOHEPICQU-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/285—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyethers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D12/00—Non-structural supports for roofing materials, e.g. battens, boards
- E04D12/002—Sheets of flexible material, e.g. roofing tile underlay
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/02—2 layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/03—3 layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0253—Polyolefin fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2274/00—Thermoplastic elastomer material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/71—Resistive to light or to UV
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/718—Weight, e.g. weight per square meter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/726—Permeability to liquids, absorption
- B32B2307/7265—Non-permeable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/744—Non-slip, anti-slip
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2419/00—Buildings or parts thereof
- B32B2419/06—Roofs, roof membranes
Definitions
- the invention relates to a roofing membrane and a process for producing the roofing membrane.
- a roofing membrane and a process for producing the roofing membrane are known from EP-A-1 100844.
- roofing membranes are often applied at pitched roofs, below the roof covering, for example below tiles, slates etc.
- a roofing membrane is a barrier for water to penetrate into buildings, for example coming from leakages in the roof covering, formed by melting of fine snow that has been blown through gaps between tiles, or due to water penetration by driving rains.
- the sheet has an adequate permeability for water vapor (also expressed as moisture vapor transmission rate), humidity that tends to accumulate in buildings is released, keeping the indoor condition dry enough to ensure the good health of people living or working in the buildings and to avoid rot in wooden structures of buildings, for example in wooden beams of the roof construction.
- roofing membranes in general comprise a layer of a fleece and a layer of a barrier film or two layers of fleece and a barrier film, the barrier film being located between the two layers of fleece.
- the barrier film of the roofing membrane of EP-A-1 100844 consists of a polymer composition comprising a copolyether ester.
- the barrier film of a polymer composition comprising a copolyether ester include that the film may be produced with a low thickness. This counts for both roofing membranes produced by lamination and by extrusion coating. Furthermore the copolyether ester has a good thermal stability, which is important, since the roofing membrane may be subjected to high temperatures, especially if applied below tiles. After application at the roof the sheet is occasionally exposed for several months, up to four month is a period normally accepted by roof builders, to UV radiation by sunlight, before the roof covering is applied. Also after the covering is applied exposure might continue, because of openings in the roof covering, letting rays of sunlight through.
- a disadvantage of the copolyether ester is the low UV-resistance. This may be solved by the addition of UV stabilizers and/or UV absorbers, as for instance disclosed in EP-A-1 100844, but especially the UV stabilizers are costly and there is still need for a further improved UV-resistance.
- the film of the polymer composition comprising the copolyether ester is slippery. Since the layer of the barrier film of the roofing membrane is often applied facing the outside of the building, the building constructors often have to walk on the film. If the film is slippery this may cause a problem with respect to safety.
- the barrier film consists of a polymer composition comprising a thermoplastic polyurethane.
- Advantages of a thermoplastic polyurethane include the very high level of UV-resistance obtainable with suitable UV stabilizers and/or UV absorbers and the high coefficient of friction of the surface, providing low slipperiness.
- a large disadvantage of the thermoplastic polyurethane is the low viscosity. Because of the low viscosity it is not possible to produce the barrier film with a low thickness, making the film from a viewpoint of costs unattractive. Aim of the invention is to provide a roofing membrane that does not show these disadvantages and that is nevertheless cost attractive.
- a roofing membrane comprising a barrier film of a polymer composition comprising a copolyether ester and a
- thermoplastic polyurethane thermoplastic polyurethane
- the polymer composition may be extruded into a thin barrier film, even at high extrusion speed, similar to the extrusion of the barrier film of the thermoplastic copolyether ester.
- barrier film of the roofing membrane according to the invention shows a very high UV resistance, similar to the UV resistance of the barrier film of the thermoplastic polyurethane.
- barrier film of the roofing membrane according to the invention shows a very high temperature resistance, similar to the high temperature resistance of the barrier film of the thermoplastic copolyether ester elastomer.
- roofing membrane is more cost effective, because of the relatively low price of TPU. This while this is not the case for a roofing membrane comprising a barrier film of TPU, because TPU cannot being processed into a barrier film with a low thickness.
- the copolyether ester suitably contains hard segments that are built up from repeating units derived from at least one alkylene diol and at least one aromatic dicarboxylic acid or an ester thereof.
- segment also the term block is being used.
- the linear or cycloaliphatic alkylene diol contains generally 2-6 C- atoms, preferably 2-4 C-atoms. Examples thereof include ethylene glycol, propylene diol and butylene diol. Preferably propylene diol or butylene diol are used, more preferably 1 ,4-butylene diol.
- Suitable aromatic dicarboxylic acids include terephthalic acid, 2,6-naphthalenedicarboxylic acid, 4,4'-biphenyldicarboxylic acid or combinations of these.
- the advantage thereof is that the resulting polyester is generally semi-crystalline with a melting point of above 150, preferably above 175, and more preferably of above 190°C.
- the hard segments may optionally further contain a minor amount of units derived from other dicarboxylic acids, for example isophthalic acid, which generally lowers the melting point of the polyester.
- the amount of other dicarboxylic acids is preferably limited to not more than 10, more preferably not more than 5 mol%, so as to ensure that, among other things, the crystallization behaviour of the copolyether ester is not adversely affected.
- the hard segment is preferably built up from ethylene terephthalate, propylene terephthalate, and in particular from butylene terephthalate as repeating units. Advantages of these readily available units include favourable crystallisation behaviour and a high melting point, resulting in copolyether esters with good processing properties, excellent thermal and chemical resistance and good puncture resistance.
- Suitable aliphatic polyether soft segments in the copolyether ester of component (a) are flexible polyethers that are substantially amorphous and have a glass-transition temperature (T g ) of below 0°C.
- T g glass-transition temperature
- the T g is below -20 °C, more preferably below -40, and most preferably below -50 °C.
- the molar mass of the segments may vary within a wide range, but preferably the molar mass is chosen between 400 and 6000, more preferably between 500 and 4000, and most preferably between 750 and 3000 g/mol.
- Suitable aliphatic polyethers include a poly(alkylene oxide)diol derived from an alkylene oxide of 2-6 C-atoms, preferably 2-4 C-atoms, or combinations thereof. Examples include poly(ethylene oxide)diol, poly(tetramethylene oxide)diol or poly(tetrahydrofuran)diol, poly(neopentylene oxide-co-tetramethylene oxide)diol, poly(propylene oxide)diol and ethylene oxide-terminated poly(propylene oxide)diol. High durability of the sheet according to the invention is obtained if the copolyether ester contains as polyether segments polypropylene glycol segments, polyethylene glycol segments and/or polytetrahydrofuran segments.
- Polytetrahydrofuran segments provide the best durability, polyethylene glycol segmenst provide a combination of high durability and high vapour permeability
- the copolyether ester may further contain a compound with two or more functional groups that can react with an acid- or hydroxyl-group, acting as chain extension or chain branching agent, respectively.
- suitable chain extension agents include carbonylbislactams, diisocyanates and bisepoxides.
- Suitable chain branching agents include e.g. trimellitic acid, trimellitic acid anhydride and trimethylol propane. The amount and type of chain extension or branching agent is chosen such that a block copolyester of desirable melt viscosity is obtained. In general, the amount of a chain branching agent will not be higher than 6.0 equivalents per 100 moles of dicarboxylic acids presenting the copolyether ester.
- copolyether esters are for example described in Handbook of Thermoplastics, ed. O.OIabishi, Chapter 17, Marcel Dekker Inc., New York 1997, ISBN 0-8247-9797-3, in Thermoplastic Elastomers, 2nd Ed, Chapter 8, Carl Hanser Verlag (1996), ISBN 1 -56990-205-4, in Encyclopedia of Polymer Science and Engineering, Vol. 12, Wiley & Sons, New York (1988), ISBN 0-471 -80944, p.75-1 17, and the references cited therein.
- Thermoplastic polyurethanes may be formed by the reaction between diisocyanates, short chain doils or diamines and long chain diols or diamines. Commonly used as diisocyanates is 4,4'-diphenylmathane diisocyanate (MDI). Short chain diols may be used as chain extenders. Examples of such short chain diols include ethylene glycol, 1 ,4 butane diol and 1 ,6-hexanediol. Preferably as long chain diols polyetherdiols or polyetherdiamines are used. As long chain diols preferably the same polyether diols or diamines are used as described above for the copolyether ester. Instead of a diol it is possible to use a corresponding diamine.
- MDI 4,4'-diphenylmathane diisocyanate
- Short chain diols may be used as chain extenders. Examples of such short chain diols include
- the polymer composition of the barrier film of the roofing membrane according to the invention comprises preferably 10 - 70 parts by weight (pbw) TPU and 90 - 30 pbw TPEE, the amounts of TPU and TPEE adding up to 100 pbw. More preferably the polymer composition comprises 20 - 60 pbw TPU and 80 - 40 pbw TPEE, the amounts of TPU and TPEE adding up to 100 pbw. Even more preferably the polymer composition comprises 30 - 50 pbw TPU and 70 - 50 pbw TPEE, the amounts of TPU and TPEE adding up to 100 pbw.
- the polymer composition consists of the TPU, the TPEE and non-polymeric additives, such as for example colorants, pigments, stabilizers and processing aids.
- the roofing membrane according to the invention may contain the barrier film and at one or two surfaces of the film a fleece.
- fleece normally a non- woven or needle punched fleece is used.
- the roofing membrane consists of the film of the polymer composition.
- Such membranes are also referred to as monolithic films.
- the advantage of a monolithic film is that the film is easy to produce and is yet very flexible at low temperatures, making the film resistant against mechanical stresses caused by winds at low temperatures. It is possible to extrude a film by blow molding or to extrude a flat film in a first step.
- the roofing membrane according to the invention may be formed by adhering the film to the fleece by using a glue.
- a flat film extrusion process is used, wherein the barrier film is extruded and wherein thereafter the barrier film is still in the molten state brought in contact with the fleece, so that after cooling of the film, the film is adhered to the fleece.
- the thickness of the barrier film may be up to 200 ⁇ , preferably the thickness is between 25 and 150 ⁇ , more preferably between 50 and 100 ⁇ .
- Fig. 1 shows a membrane according to the invention consisting of a barrier film and a fleece.
- Fig .2 shows a membrane according to the invention consisting of a fleece and two barrier films, one at each side of the fleece.
- Fig. 3 shows a membrane according to the invention consisting of a barrier film and two fleeces, one at each side of the barrier film.
- Fig. 4 shows a co-extrusion line for carrier out the preferred process of the present invention.
- Fig. 1 shows a membrane (1 ) according to the invention consisting of a fleece (3) and a barrier film (2) consisting of a polymer composition comprising a TPU and a TPEE.
- Fig. 2 shows a membrane (1 1 ) according to the invention consisting a fleece (3) and of two barrier films (2), one at each side of the fleece.
- Fig. 3 shows a membrane (21 ) according to the invention consisting of two fleeces (3.1 ) and (3.2) and a barrier film (2).
- Fig. 4 shows a flat film extrusion line for producing the membrane according to the invention.
- the extrusion line comprises an extruder (20) for delivering a molten polymer composition comprising the TPU and the TPEE die head (30).
- the barrier film (2) of the polymer composition is after leaving the die head brought in contact with the fleece (3) so that after cooling down the film adheres to the fleece.
- EM400 Arnitel® EM400 , a copolyether ester delivered by DSM Engineering Plastics.
- E2-UV masterbatch Arnitel® E2-UV, a masterbatch of COPOLYETHER ESTER, comprising UV stabilizers, delivered by DSM Engineering Plastics.
- MVT 75AT3 Estane MVT 75AT3 a thermoplastic polyurethane elastomer (TPU) delivered by Lubrizol Advanced Materials.
- Fleece Polypropylene non-woven available from RKW in Gronau Preparation of roofing membranes.
- the roofing membranes were produced at an extrusion coating machine from the company SML (Austria).
- the extruder was fitted with a barrier screw, melt sieve and a gear pump.
- the TPEE and TPU resins were dried before use.
- the TPEE, TPU and masterbatch were dry blended before extrusion, in the amounts as indicated in table 1 .
- the extruder was filled with the before mentioned dry-blend.
- the melt obtained in the extruder was extruded on top the fleece material. Thereafter the film was cooled down, the film being bonded to the fleece.
- the structure is further explained in Figure 1.
- Example 1 &2 Sample compositions of Examples 1 &2 and Comparative Examples A&B are listed in table 1 .
- the examples 1 &2 are directed to sheets according to the invention, comprising barrier film of a TPEE and a TPU as explained above.
- Comparative examples A&B are directed to barrier films comprising either TPEE and a masterbatch or TPU and a masterbatch.
- the preparation of the roofing membranes is the same as for the examples.
- the sample compositions as listed in table 1 are processed at different extrusion speeds.
- the extruder setting were such that the output of both extruders is equal.
- Coating thickness was determined by weight.
- the target layer thickness for all extrusion conditions was 40 grams per square meter.
- the different extrusion conditions are listed in table 2.
- the comparative examples A&B show the difference in processability of the copolyether ester composition compared to the TPU composition.
- the copolyether ester composition can be produced in thin layers at 80 meters per minute line speed without any problems to provide a 40 grams per square meter film.
- the TPU composition on the other hand can't be processed at speeds as of 60 meters per minute if a coating thickness of 40 grams per square meter is demanded.
- Examples 1 &2 show that it is possible to increase the line speed of the machine up to 80 meters per minute when an extrusion film out of a composition comprising a copolyether ester and a TPU is used.
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP2015156372 | 2015-02-24 | ||
PCT/EP2016/052383 WO2016134941A1 (en) | 2015-02-24 | 2016-02-04 | Roofing membrane and process for producing the roofing membrane |
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Publication Number | Publication Date |
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EP3262121A1 true EP3262121A1 (en) | 2018-01-03 |
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Application Number | Title | Priority Date | Filing Date |
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EP16703111.1A Withdrawn EP3262121A1 (en) | 2015-02-24 | 2016-02-04 | Roofing membrane and process for producing the roofing membrane |
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EP (1) | EP3262121A1 (en) |
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2016
- 2016-02-04 EP EP16703111.1A patent/EP3262121A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
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See references of WO2016134941A1 * |
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