| http://www.w3.org/ns/prov#value | - It is well known to those skilled in the art that it has until now been considered as impossible to provide plastics sheets or films, made of polyolefines such as polyethylene or polypropylene, which are perfectly opaque, i.e. which are non-transparent and non-translucent, without seriously impairing their mechanical properties such as elasticity, tear resistance, flexibility and break elongation,
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