Adhesive compositions based on blends of grafted metallocene...

Details Adhesive compositions based on blends of grafted metallocene... Adhesive compositions based on blends of grafted metallocene...

C - Chemistry, Metallurgy

09

J

C09J 123/08 (2006.01) B32B 7/12 (2006.01) B32B 27/32 (2006.01) B32B 27/34 (2006.01) C09J 131/02 (2006.01) C09J 133/08 (2006.01) C09J 151/06 (2006.01)

Patent

CA 2314074

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 and EVA or EMA 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.

Ces compositions adhésives à base de polyéthylène, qui contiennent de 5 à 35 % en poids d'un polyéthylène métallocène greffé à l'acide, sont dotées d'une résistance au pelage supérieure à celle de compositions comparable contenant un polyéthylène non métallocène greffé à l'acide et un polyéthylène vinyl-acétate (EVA) ou un polyéthylène méthacrylate (EMA). Les 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'un poids moléculaire en poids/poids moléculaire en nombre (Mw/Mn) inférieur à l'indice de fluage moins 4,63, s'avèrent être de 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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