Patent ID: 8202929

Claim:
A polymer mixture consisting of: at least one synthetic first polymer P(i) and between 3% to 14% by weight of at least one second polymer P(j), wherein the first polymer P(i) has a degree of polymerisation DP(P(i))>500 and at least one type of crystallisable sequences A having a degree of polymerisation DPs(P(i)) of these sequences >20, wherein the second polymer P(j) is made up of the same monomer units as the sequences A of P(i) and the degree of polymerisation DP(P(j)) of P(j) is 20<DP(P(j))<500, wherein the polymer mixture comprises a molecularly dispersed mixture containing P(i) and P(j) that forms a network by heterocrystallisation, wherein P(i), or the sequences A of P(i), comprises a polyethylene, wherein P(j) has a polydispersivity <30 and is a polyethylene wax; and wherein P(i) has a degree of branching <3×10 −2 , and P(j) has a degree of branching <5×10 −2 , wherein the first polymer P(i) and the second polymer P(j) have been mixed together using a twin screw extruder, and wherein the polymer mixture of the first polymer P(i) and the second polymer P(j) has an elongation at break greater than an elongation at break of the first polymer P(i) alone.