Multi-layer moulding
Multi-layer moulding, containing a body part and a surface layer which at least partly covers the body part, which body part contains a cross-linked elastomer composition and which surface layer contains a thermoplastic elastomer, in which the surface layer of the multi-layer moulding, in a weather resistance test according to DIN 75202, in which the surface layer is continuously exposed for at most 100 hours to light from a xenon light source, which light source is provided with a borosilicate “S” inner filter and a soda lime outer filter, at a relative humidity of 30%, with an intensity of 1.40 W/m 2 at 420 nanometres on the surface of the moulding, a black standard temperature of 100° C., in a space with a temperature of 66° C., develops a colour deviation with a ΔE of at most 3.0, measured according to ASTM D 1925.
1. Multi-layer moulding, containing a body part and a surface layer which at least partly covers the body part, which body part contains a cross-linked elastomer composition which contains oil, which oil has an aromatic compounds content of less than 2 wt %, and which surface layer contains a thermoplastic elastomer, wherein at the surface layer of the multi-layer moulding, in a weather resistance test according to DIN 75202, in which the surface layer is continuously exposed for 100 hours to light from a xenon light source, which light source is provided with a borosilicate “S” inner filter and a soda lime outer filter, at a relative humidity of 30%, with an intensity of 1.40 W/m 2 at 420 nanometres on the surface of the moulding, a black standard temperature of 100° C., in a space with a temperature of 66° C., a colour deviation with ΔE of at most 3.0 develops, measured according to ASTM D 1925.
2. Multi-layer moulding according to claim 1 , wherein, in the weather resistance test, the surface layer is exposed for 300 hours.
3. Multi-layer moulding according to claim 1 , wherein, in the weather resistance test, the surface layer is exposed for 500 hours.
4. Multi-layer moulding according to claim 1 , wherein the elastomer composition of the body part is chosen such that the colour deviation with a ΔE of at most 3.0, measured according to ASTM D 1925, is achieved.
5. Multi-layer moulding according to claim 1 , wherein the oil, which oil has an aromatic compounds content of less than 1 wt. %.
6. Multi-layer moulding according to claim 1 , wherein the oil has a polar compounds content of less than 0.5 wt. %.
7. Multi-layer moulding according to claim 1 , wherein the oil has a polar compounds content of less than 0.2 wt. %.
8. Multi-layer moulding according to claim 1 , wherein the elastomer composition of the body part contains an elastomer obtained by the polymerization of ethene and an α-olefin.
9. Multi-layer moulding according to claim 1 , wherein the elastomer composition of the body part contains an EPDM elastomer obtained by the polymerization of ethene, an α-olefin and a non-conjugated polyene.
10. Multi-layer moulding according to claim 1 , wherein the thermoplastic elastomer composition of the surface layer contains a TPV.
11. Multi-layer moulding according to claim 1 , wherein the thermoplastic elastomer composition of the surface layer contains one or more UV stabilizers.
12. Multi-layer moulding according to claim 1 , wherein the surface layer has a white tint or a chromatic colour.
13. Multi-layer moulding according to claim 1 , wherein the moulding chosen is a profile or a hose.