LAMINATE CONTAINING A METAL AND A POLYMER LAYER OF A POLYAMIDE AND AN ACRYLATE

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), wherein the polymer composition (PC) comprises the following components: (A) at least one polyamide, (B) at least one first copolymer obtainable by polymerizing at least the following components: (B1) at least one first C.sub.2-C.sub.20-alkene and (B2) at least one second C.sub.2-C.sub.20-alkene, wherein components (B1) and (B2) are different than one another, and (C) at least one second copolymer obtainable by polymerizing at least the following components: (C1) at least one third C.sub.2-C.sub.20-alkene and (C2) at least one acrylic acid derivative.

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 component (A) is selected from the group consisting of PA 6, PA 6.6, PA 6.10, PA 6.12, PA 12, PA 6.36, PA 6/6.6, PA 6/616T, PA 6/61, PA 6/6.36 and PA 6/6T.

4. The laminate according to claim 1, wherein component (B1) is selected from the group consisting of ethene, propene, 1-butene, 2-butene, octene and butadiene.

5. The laminate according to claim 1, wherein component (B2) is selected from the group consisting of ethene, propene, 1-butene, 2-butene, octene and butadiene.

6. The laminate according to claim 1, wherein component (C1) is selected from the group consisting of ethene, propene, 1-butene, 2-butene, octene and butadiene.

7. The laminate according to claim 1, wherein component (C2) is selected from the group consisting of methyl acrylate, butyl acrylate and acrylic acid.

8. The laminate according to claim 1, wherein component (B) is obtainable by polymerizing an additional component (B4), maleic anhydride.

9. The laminate according to claim 1, wherein the polymer composition (PC) comprises in the range from 40% to 99% by weight of component (A), based on the sum total of the percentages by weight of components (A), (B) and (C).

10. 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 also alloys thereof.

11. 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 to 2 mm.

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 the following components: (A) at least one polyamide, (B) at least one first copolymer obtainable by polymerizing at least the following components: (B1) at least one first C.sub.2-C.sub.20-alkene and (B2) at least one second C.sub.2-C.sub.20-alkene, where components (B1) and (B2) are different than one another, and (C) at least one second copolymer obtainable by polymerizing at least the following components: (C1) at least one third C.sub.2-C.sub.20-alkene and (C2) at least one acrylic acid derivative, 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

[0242] The following components were used:

[0243] Polyamide

[0244] P1: nylon-6 (Ultramid B24N from BASF SE)

[0245] Copolymers [0246] Co1: Lucalen A2700 M (Basell); ethylene/n-butyl acrylate copolymer (MFR (190° C./2.16 kg to ISO 1133) 7.2 g/10 min) [0247] Co2: Lucalen A2540 D (Basell); ethylene/n-butyl acrylate copolymer (MFR (190° C./2.16 kg to ISO 1133) 0.25 g/10 min) [0248] Co3: Lucalen A2910 M (Basell); ethylene/t-butyl acrylate/acrylic acid copolymer (MFR (190° C./2.16 kg to ISO 1133) 7 g/10 min) [0249] Co4: Exxelor 1801 (Exxon Chemicals); ethylene/propylene/MA copolymer; [0250] Co5: Lupolen 1800s (Basell); ethylene/propylene/MA copolymer; LDPE (low density polyethylene)

[0251] Additives:

[0252] A1: Irganox (antioxidant)

[0253] A2: Talc

[0254] First and Second Metal

[0255] Steel

[0256] Production of the Laminates

[0257] The polymers specified in table 1, in the amount specified in table 1, were compounded with a ZE 25A UXTI twin-screw extruder and extruded to a film of thickness 430 μm and width 53 cm. The amounts specified in table 1 are all in % by weight.

[0258] The films of the polymer composition (PC) and of the first sheet and the second sheet of the steel were stored at 80° C. for 7 days prior to the production. For production of the laminate, the first sheet of steel and the second sheet of steel were inserted into an apparatus, and a film of the polymer composition was inserted between the first sheet and the second sheet. The sheets were pressed and heated inductively to a temperature of 240° C. within 3 seconds, and kept at that temperature for 7 seconds. The laminate was subsequently cooled with compressed air for 20 seconds and the pressing force was released during further cooling to room temperature.

[0259] The resultant laminates were cut into strips of width 40 mm and subjected to a peel test to ASTM D1876. The results can likewise be seen in table 1.

TABLE-US-00003 TABLE 1 Example Example Example Comparative 1 2 3 example 4 P1 [% by wt.] 59.1 59.1 59.1 59.1 Co1 [% by wt.] 25 Co2 [% by wt.] 25 Co3 [% by wt.] 25 Co4 [% by wt.] 15 15 15 15 Co5 [% by wt.] 25 A1 [% by wt.] 0.5 0.5 0.5 0.5 A2 [% by wt.] 0.4 0.4 0.4 0.4 Peel [N/40 m] 616 798 460 337 test

[0260] The laminate of the invention has particularly good peeling properties.