Details

C - Chemistry, Metallurgy

09

J

C09J 151/06 (2006.01) C08L 23/08 (2006.01) C08L 51/06 (2006.01)

Patent

CA 2500208

The invention relates to a coextrusion binder containing: between 5 and 35 wt.- % of a polymer (A) comprising a mixture of between 80 and 20 wt.- % of a metallocene polyethylene (A1) having a density of between 0.863 and 0.915 and between 20 and 80 wt.- % of a non-metallocene LLDPE polyethylene (A2) having a density of between 0.9 and 0.95, the mixture of polymers A1 and A2 being co-grafted; and between 95 and 65 wt.- % of homo-or copolymer metallocene polyethylene (B), the comonomer of which comprises between 3 and 20 carbon atoms, preferably between 4 and 8 carbon atoms, having a density of between 0.863 and 0.915 and an MFI of between 0.5 and 30, preferably between 3 and 15 g/10 min, with the total adding up to 100 %. The mixture of A and B is such that the MFI thereof is between 0.1 and 15 and, preferably, between 1 and 13 g/10 min.

L'invention a pour objet un liant de coextrusion comprenant : 5 à 35 % en poids d'un polymère (A) lui-même constitué d'un mélange de 80 à 20 % en poids d'un polyéthylène métallocène (Ai) de densité comprise entre 0,863 et 0,915 et de 20 à 80 % en poids d'un polyéthylène LLDPE (A2) non métallocène de densité comprise entre 0,900 et 0,950, le mélange de polymères (A1) et (A2) étant cogreffé ; 95 à 65 % en poids de polyéthylène métallocène (B) homo ou copolymère dont le comonomère comprend 3 à 20 atomes de carbone, de préférence 4 à 8 atomes de carbone, dont la densité est comprise entre 0,863 et 0,915 et dont le MFI est compris entre 0,5 et 30, de préférence entre 3 et 15 g/ 10 min ; le total faisant 100 %, le mélange de (A) et (B) étant tel que son MFI est compris entre 0,1 et 15, de préférence entre 1 et 13 g / 10 min.

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