LAMINATES THAT CONSIST OF METAL AND A POLYMER INTERMEDIATE LAYER MADE OF THERMOPLASTIC POLYURETHANE

Abstract

Described herein is a laminate including at least one first layer of at least one first metal and at least one further layer of a polymer composition (PC). Also described herein is a process for producing the laminate.

Claims

1. A laminate comprising at least one first layer of at least one first metal and at least one further layer of a polymer composition (PC) comprising at least one thermoplastic polyurethane (TPU), wherein the at least one thermoplastic polyurethane (TPU) is obtainable by polymerizing at least the following components: (A) at least one polyether polyol, (B) at least one polyisocyanate, and (C) at least one C.sub.2-C.sub.20 polyol.

2. The laminate according to claim 1, wherein the laminate additionally comprises at least one second layer of at least one second metal and wherein the at least one first layer is joined to the at least one second layer via the at least one further layer.

3. The laminate according to claim 1, wherein the at least one thermoplastic polyurethane (TPU) has a glass transition temperature (T.sub.G(TPU)) in the range from −150° C. to 20° C.

4. The laminate according to claim 1, wherein the thermoplastic polyurethane (TPU) is obtainable by polymerizing in the range from 5% to 50% by weight of component (A), in the range from 20% to 80% by weight of component (B) and in the range from 5% to 40% by weight of component (C), based in each case on the sum total of the percentages by weight of components (A), (B) and (C).

5. The laminate according to claim 1, wherein component (B) is selected from the group consisting of diphenylmethane 4,4′-diisocyanate, diphenylmethane 2,4′-diisocyanate and diphenylmethane 2,2′-diisocyanate.

6. The laminate according to claim 1, wherein component (C) is selected from the group consisting of ethylene glycol, propane-1,2-diol, propane-1,3-diol and butane-1,4-diol.

7. The laminate according to claim 1, wherein the at least one thermoplastic polyurethane (TPU) has a modulus of elasticity in the range from 800 to 1400 MPa.

8. The laminate according to claim 1, wherein component (A) has a number average molecular weight (M.sub.n) in the range from 100 to 8000 g/mol.

9. The laminate according to claim 1, wherein the at least one first metal is selected from the group consisting of iron, aluminum, copper, nickel and magnesium and alloys thereof.

10. The laminate according to claim 1, wherein the at least one first layer has a thickness in the range from 0.1 mm to 0.6 mm and/or wherein the at least one further layer has a thickness in the range from 0.02 mm to 1.5 mm.

11. The laminate according to claim 1, wherein the polymer composition (PC) further comprises at least one additive selected from the group consisting of stabilizers, dyes, antistats, filler oils, surface improvers, siccatives, demolding agents, release agents, antioxidants, light stabilizers, PVC stabilizers, lubricants, flame retardants, blowing agents, impact modifiers, adhesion promoters, coupling agents and nucleating agents.

12. A process for producing a laminate according to claim 1, comprising the steps of a) providing a film of a polymer composition (PC) comprising at least one thermoplastic polyurethane (TPU), where the at least one thermoplastic polyurethane (TPU) is obtainable by polymerizing at least the following components: (A) at least one polyether polyol, (B) at least one polyisocyanate, and (C) at least one C.sub.2-C.sub.20 polyol, b) heating a first sheet of at least one first metal, and c) pressing the heated first sheet from step b) with the film provided in step a) to obtain the laminate.

13. The process according to claim 12, wherein step b) comprises heating the first sheet to a temperature in the range from 150° C. to 350° C.

14. The process according to claim 12, wherein the heating of the first sheet in step b) is effected by inductive means.

15. The process according to claim 12, wherein step a) comprises providing the film by an extrusion process.

Description

EXAMPLES

[0194] The following components were used:

[0195] Thermoplastic Polyurethane [0196] TPU1: Elastollan 1174 D (thermoplastic polyurethane from BASF SE; MDI/polyetherol copolymer) [0197] TPU2: Elastollan 1283 D11 (thermoplastic polyurethane from BASF SE; MDI/polyetherol copolymer) [0198] TPU3: Elastollan C74 D (thermoplastic polyurethane from BASF SE; MDI/polyesterol copolymer)

[0199] First and Second Metal

[0200] Steel

[0201] Production of Laminates

[0202] The polymers specified in table 1, in the amounts specified in table 1, were compounded at 230° C. with a Haake PolyLab QC with a CTW100 extruder to obtain a polymer composition, and extruded through a slot film die of width 100 mm. The resultant strand was processed by means of a water-cooled roll of width 20 cm wide to form a film of width at least 5 mm and thickness 420 μm, and wound up. The amounts specified in table 1 are all in percent by weight.

[0203] The films of the polymer composition and the first sheet and the second sheet of the steel were dried at 80° C. and a pressure of <5 mbar for seven days prior to the production of the laminates.

[0204] The laminate was produced by inserting a first sheet of the steel and a second sheet of the steel into an apparatus. A film of the polymer composition was placed between the first sheet and the second sheet. The sheets were pressed with a hydraulic press at 250° C. and 30 bar for 60 seconds.

[0205] For cooling, the laminate was removed hot from the press and covered with a steel sheet (40×40 mm, thickness 5 mm). After cooling, the laminates were stored under air with <1% relative humidity. The specimens were measured in a Zwick tester (Zwicki BT1-FR5.0TN with pneumatic clamping jaws) in accordance with DIN EN ISO 11339, with a measurement speed of 200 mm/min and a specimen thickness of 0.85 to 0.9 mm. The tensile force in newtons (N) ascertained from the measurement distance of 100 mm is used to form the average over the entire measurement, and corrected by calculation to a width of 40 mm. The results (T-peel) for the various laminates can likewise be seen in table 1.

[0206] The modulus of elasticity of the laminates was determined to ISO 527-1:2012. The results can likewise be seen in table 1.

TABLE-US-00001 TABLE 1 Modulus of elasticity T-Peel TPU1 TPU2 TPU3 [MPa] [N] E1 PC1 70 30 1030 553 E2 PC2 60 40 1150 456 E3 PC3 50 50 1290 449 E4 PC4 40 60 1430 380 E5 PC5 100 670 544 C6 PC6 100 660 337 C7 PC7 50 50 1260 375 E8 PC8 100 1922 54

[0207] The laminates of the invention have particularly good peel properties and a good modulus of elasticity.