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The Arkema France patent solves the following problem:
The improvement in impact strength of polyamides are usually obtained by integrating, in the form of a dispersed phase, an impact modifier which is elastomeric in nature and have reactive functional groups (acrylic acid, maleic anhydride, etc.) can react with the functional groups, such as NH2 chain end, the polyamide matrix. reactivity This makes it possible to ensure a fine homogeneous dispersion of the elastomer by controlling the size of the particles or nodules, a good adhesion to the nodule / matrix interface, and obtain a highest increase in impact strength. However, the drawback of this approach is the thickening of the blend, because the modifier coupling PA-effects, which leads to a significant fall in the melt flow. This great change in viscosity disrupt the processing of the composition, especially for thin or large-sized injection-molded parts, and extrusion.
Our analysis of this patent is as follows:
Arkema France’s patent US 8410216 B2 deals with Impact-resistant composition based on a polyamide resin and on a blend of at least one graft copolymer with polyamide blocks and a low-density ethylene polymer.
The invention relates to a composition based on an impact-resistant thermoplastic polyamide resin, which contains, as a blendfrom 60 to 98 wt% of polyamide resin (A) andfrom 2 to 40 wt% of a combination of at least one graft copolymer with polyamide blocks (B) comprising a polyolefin backbone and at least one polyamide graft in which the grafts attached to the backbone by the residues of an unsaturated monomer (X) having a functional group able to react in a wet-terminated polyamide, the residues of the unsaturated monomer (X) attached to the backbone by grafting or copolymerization via its double bond, and a non -sumbalik ethylenic polymer (C) is miscible in (B) and has a density below 0.960 g / cm3.
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