LOW TEMPERATURE PE TOPCOAT
The present invention concerns the use of a particular ethylene polymer for providing coating compositions displaying improved values for elongation at break at −45° C., rendering coating compositions prepared in accordance with the present invention suitable for low temperature applications.
1 - 10 . (canceled)
11 . A method for extending the service lifetime of a rigid substrate at temperatures of −45° C. or lower, the method comprising coating the rigid substrate with an ethylene polymer comprising from 80 to 100% by weight of ethylene repeating units and from 3.5 to 4.5% by weight of α-olefin comonomer repeating units, based on total weight of the ethylene polymer, wherein the ethylene polymer comprises a density of between 0.937 and 0.945 g/cm 3 when measured according to ISO 1183 D and an elongation at break at −45° C. of at least 150% when measured according to GOST 11262.
12 . The method of claim 11 , wherein the α-olefin comonomer repeating units are derived from C 3 -C 10 α-olefins.
13 . The method of claim 11 , wherein the ethylene polymer has a melt flow rate (MFR) ranging from 0.2 to 1.0 g/10 min when measured according to ISO 1133 D.
14 . The method of claim 11 , wherein the ethylene polymer is a multimodal ethylene polymer.
15 . The method of claim 11 , wherein the ethylene polymer is a bimodal ethylene polymer.
16 . The method of claim 11 , wherein the ethylene polymer is a reactor blend.
17 . The method of claim 11 , wherein the α-olefin comonomer is derived from 1-butene.
18 . The method of claim 11 , wherein the ethylene polymer has a density ranging from 0.939 to 0.941 g/cm 3 when measured according to ISO 1183 D.
19 . The method of claim 11 , wherein the ethylene polymer is further compounded with additives for coating applications.
20 . The method of claim 12 , wherein the ethylene polymer has a melt flow rate (MFR) ranging from 0.2 to 1.0 g/10 min when measured according to ISO 1133 D.
21 . The method of claim 12 , wherein the ethylene polymer is a multimodal ethylene polymer.
22 . The method of claim 12 , wherein the ethylene polymer is a bimodal ethylene polymer.
23 . The method of claim 12 , wherein the α-olefin comonomer is derived from 1-butene.
24 . The method of claim 12 , wherein the ethylene polymer has a density ranging from 0.939 to 0.941 g/cm 3 when measured according to ISO 1183 D.
25 . The method of claim 11 , wherein the rigid substrate is a steel pipe.
26 . The method of claim 11 , wherein the elongation at break at −45° C. is at least 200% when measured according to GOST 11262.
27 . The method of claim 11 , wherein the elongation at break at −45° c. is at least 250% when measured according to GOST 11262.