Adhesive compositions based on blends of grafted metallocene...

C - Chemistry – Metallurgy – 09 – J

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C09J 123/04 (2006.01) B32B 7/12 (2006.01) B32B 27/32 (2006.01) C09J 151/06 (2006.01)

Patent

CA 2243327

Polyethylene-based adhesive compositions which contain as little as 5 weight percent, and up to 35 weight percent of an acid-grafted metallocene polyethylene have superior peel strength to comparable compositions containing an acid grafted non-metallocene polyethylene. Compositions where the acid-grafted metallocene polyethylene component is based on a metallocene polyethylene having a melt-flow ratio of less than 6.53 and an Mw/Mn of greater than the melt flow ratio less 4.63 are as good adhesive compositions as those based on metallocene resins falling outside these parameters.

L'invention a trait à des compositions adhésives à base de polyéthylène contenant un polyéthylène métallocène greffé à l'acide en une teneur allant de 5 % à 35 % en poids. Ces compositions sont dotées d'une résistance au pelage supérieure à celle de compositions comparables contenant un polyéthylène non métallocène greffé à l'acide. Des compositions dans lesquelles le constituant polyéthylène métallocène greffé à l'acide est un polyéthylène métallocène doté d'un indice de fluage inférieur à 6,53 et d'une distribution de masse moléculaire Mw/Mn supérieure à l'indice de fluage moins 4,63, s'avèrent être des compositions dont les qualités d'adhérence sont aussi élevées que celles de compositions à base de résines métallocènes dont les valeurs excèdent ces paramètres.

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