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AssigneeAtofina
InventorsFrancois Court, Marius Hert, Patrice Robert, Martin Baumert
Estimating the term…
The invention concerns a mixture comprising by weight, the total being 100%, 1 to 100% of a polyamide block copolymer consisting of a basic polyolefin chain and on an average at least a polyamide graft wherein: the grafts are fixed to the basic chain by the radicals of an unsaturated monomer (X) having a function capable of reacting with a polyamide with amine terminal, the radicals of the unsaturated monomer (X) are fixed to the basic chain by grafting or copolymerisation from its double bond; 99 to 0% of a flexible polyolefin with elastic modulus in flexure less than 150 MPa at 23° C. and having a crystalline melting point ranging between 60° C. and 100° C. Said mixtures are useful for making films, tanks, geomembrane protective fabrics produced by extrusion, products obtained by calendering, thermocladding/forming, protective films for electric cables and skins using slush moulding technique.
1 Blend comprising, by weight, the total being 100%:
2 Blend as claimed in claim 1, characterized in that the flexible polyolefin is an ethylene/alkyl (meth)acrylate copolymer.
3 Blend as claimed in either of the preceding claims, characterized in that X is an unsaturated carboxylic acid anhydride.
4 Blend as claimed in claim 3, characterized in that the polyolefin backbone containing X is chosen from ethylene/maleic anhydride and ethylene/alkyl (meth)acrylate/maleic anhydride copolymers.
5 Blend as claimed in any one of the preceding claims, characterized in that there are on average at least 1.3 mol of X attached to the polyolefin backbone.
6 Blend as claimed in claim 5, characterized in that there are on average between 1.3 and 10 mol of X attached to the polyolefin backbone.
7 Blend as claimed in any one of the preceding claims, characterized in that the grafts are homopolymers consisting of caprolactam residues, 11-aminoundecanoic acid residues or dodecalactam residues or of copolyamides consisting of residues chosen from at least two of the three above monomers.
8 Blend as claimed in any one of the preceding claims, characterized in that the molar mass of the grafts is between 1000 and 5000 g/mol.
9 Blend as claimed in any one of the preceding claims, characterized in that the proportion by weight of polyamide-block graft copolymer is 5 to 50% per 95 to 50% of flexible polyolefin, respectively.
10 Adhesive, essentially consisting of a blend as claimed in any one of claims 1 to 9.
11 Adhesive as claimed in claim 10, characterized in that it is in powder form.
12 Film, consisting of a blend as claimed in any one of claims 1 to 9.
13 Tarpaulin or geomembrane, consisting of at least one layer of a blend as claimed in any one of claims 1 to 9.
14 Product obtained by calendering a blend as claimed in any one of the preceding claims.
15 Power cable or telecommunications cable, comprising a protective layer based on a blend as claimed in any one of the preceding claims.
16 The use of a blend as claimed in any one of the preceding claims, in powder form, in the slush molding process.