Crosslinkable blend for the production of a layered article

摘要

The present invention relates to a process for the preparation of an article, comprising the following steps: (a) providing a component (i) which comprises a blend of (a1) an unsaturated first polyolefin having a certain total amount m1 of carbon-carbon double bonds/1000 carbon atoms, (a2) a crosslinking agent, (a3) optionally an unsaturated low molecular weight compound having a certain total amount m2 carbon-carbon double bonds/1000 carbon atoms, (b) providing a component (ii) which comprises a second polymer having a certain total amount m3 of carbon-carbon double bonds/1000 carbon atoms, wherein m1, m2 and m3 satisfy a certain relationship, (c) forming a blend of component (i) and component (ii) wherein the weight ratio of the component (i) to the component (ii) is within the range of 10:90 to 99:1, (d) applying one or more layers of the blend onto a substrate.

主权项

1. A process for the preparation of an article, comprising the following steps:
(a) providing a component (i) which comprises a blend of (a1) at least 60 wt % of component (i) of an unsaturated first low density ethylene polymer having a total amount m1 of carbon-carbon double bonds/1000 carbon atoms of in the range of 0.2 to 2.0, (a2) and less than 10 wt % of component (i) of a crosslinking agent, (a3) optionally an unsaturated low molecular weight compound having a molecular weight of less than 1000 g/mole and a total amount m2 of carbon-carbon double bonds/1000 carbon atoms of >0, wherein the unsaturated first low density ethylene polymer (a1) has a total amount n1 of vinyl groups/1000 carbon atoms of at least 0.1 to 2, (b) providing separately a component (ii) in an amount of 5 to 35 wt % based on combined component (i) and (ii) amounts which comprises (b1) a second polymer having a total amount m3 of carbon-carbon double bonds/1000 carbon atoms of at least 0.3 to 2.0 which includes a total amount n2 of vinyl groups/1000 carbon atoms of from about 0.1 to 2.0, wherein the second polymer (b1) is a low density ethylene homopolymer; (b2) optionally an unsaturated low molecular weight compound having a molecular weight of less than 1000 g/mole and a total amount m4 of carbon-carbon double bonds/1000 carbon atoms of >0 wherein m1, m2, m3, and m4 satisfy the following relationship:
2.0≧(m1+m2)−(m3+m4)≧0.2, m2 and/or m4 being 0 if the unsaturated low molecular weight compound(s) (a3) and/or (b2) is/are not present, and the component (i) is different from component (ii); and (c) forming a blend of component (i) and component (ii) wherein the blend has a hot set elongation of about 30 to 85% and the permanent deformation is about −6 to −1.3%, and (d) forming an article comprising the blend obtained in step (c).