Inherently open-celled polypropylene foam with large cell size

Details Inherently open-celled polypropylene foam with large cell size Inherently open-celled polypropylene foam with large cell size

C - Chemistry, Metallurgy

08

J

C08J 9/00 (2006.01) C08L 23/12 (2006.01)

Patent

CA 2584080

Foam a polymer blend of (a) a high melt strength polypropylene (HMS PP); (b) a linear or substantially linear polypropylene that has a melting point within ten degrees Celsius of (a), a melt flow rate that is significantly different than (a) and that is miscible with (a); and, optionally, (c) a polyethylene that is immiscible with (a) produces a polymeric foam having an average cell size of at least four millimeters and that has an inherent open-celled content of at least 40 percent. The HMS PP makes up 60 weight percent (wt%) or more and 90 wt% or less of the total combined weight of (a) and (b). Component (c) makes up 60 wt% or less of the total polymer blend weight.

L~invention consiste à faire mousser un mélange de polymères contenant (a) un polypropylène à résistance à la fusion élevée (HMS PP) ; (b) un polypropylène linéaire ou sensiblement linéaire qui a un point de fusion à plus ou moins dix degrés Celsius de celui de (a), un indice de fluidité à chaud nettement différent de celui de (a) et qui est miscible avec (a) ; et éventuellement, (c) un polyéthylène non miscible avec (a). On produit ainsi une mousse polymère ayant une taille cellulaire moyenne d~au moins quatre millimètres et qui a une teneur intrinsèque en cellules ouvertes d~au moins 40 %. Le HMS PP représente jusqu~à 60 %en poids ou plus et 90 % en poids ou moins du poids total combiné de (a) et (b). Le composant (c) représente jusqu~à 60 % en poids ou moins du poids total du mélange de polymères.

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