Extrusion or blow-moulding of polyamide compositions

Details Extrusion or blow-moulding of polyamide compositions Extrusion or blow-moulding of polyamide compositions

C - Chemistry, Metallurgy

08

L

C08L 77/00 (2006.01) C08L 23/02 (2006.01) C08L 51/06 (2006.01)

Patent

CA 2130476

2130476 9413740 PCTABS00032 A blow moulding process in which a parison is formed from a polyamide composition and an extrusion process in which a profile is extruded from a polyamide compositon are disclosed. The polyamide composition comprises (a) 55-90 % by weight of a polyamide selected from the group consisting of (i) polyamides having a weight average molecular weight of greater than 25 000, and (ii) polyamides that are soluble in formic acid and which have an RV measured in formic acid of at least 40; and (b) 10-45 % by weight of a polymer selected from the group consisting of grafted polymer and mixtures of grafted polymer and ungrafted polymer. Each of the grafted polymer and ungrafted polymer are independently selected from the polyolefins having a melt index of less than 10 dg/min. The polyolefin of the grafted polymer is grafted with 0.1-5.0 % by weight of an ethylenically unsaturated carboxylic acid or anhydride. The grafted polymer is 25-100 % by weight of the polymer of (b). The composition exhibits a relative increase in melt viscosity at low shear stress compared to the polyamide of (a). The compositons may be used in the blow moulding of for example bottles, containers and hollow under-the-hood automotive components and in the extrusion of for example rods, tubing, cable jacketing and other profiles.

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