METHOD FOR INCREASING RESISTANCE TO HALOGEN-CONTAINING OXIDIZING AGENTS OF A POLYAMIDE COMPOSITION

1 . A method for increasing a polymide-containing composition's resistance to halogen-containing oxidizing agents, the method comprising:

blending the polyamide with at least one phenol-carbonyl condensation product.

2 . The method according to claim 1 wherein the polyamide is either a semicrystalline or an amorphous (co)polyamide.

3 . The method according to claim 1 , wherein the polyamide is selected from the group consisting of the polyamides obtained by polycondensation of:

at least one aliphatic, cycloaliphatic or aromatic diacid with at least one aliphatic, cycloaliphatic or aromatic diamine,

at least one amino acid to itself, the amino acid preferably being an omega aminoacid generated by opening of a lactam ring, or

copolyamides obtained by the polycondensation of combinations of said diacid, diamine and/or aminoacid.

4 . The method according to claim 3 , wherein at least one of the diacid, diamine and/or aminoacid monomer used in the polycondensation comprises between 2 and 40 carbon atoms.

5 . The method according to claim 1 , wherein the polyamide is chosen from the group consisting of (co)polyamides as follows: polyamide 6, polyamide 7, polyamide 6.6, polyamide 10, polyamide 11, polyamide 12, polyamide 6.9, polyamide 5.10, polyamide 6.10, polyamide 6.12, polyamide 6.14, polyamide 10.10, polyamide 10.12, polyamide 10.14, polyamide 10.18, polyamide 12.12, polyamide 4.6, polyamide 6.18, polyamide 6.36, polyamide 9.T, polyamide MXD6, polyamide 6.6/6.T, polyamide 6.6/MPMD.T, polyamide 66.61 and blends and copolymers based on these polyamides.

6 . The method according to claim 1 , wherein the phenol-carbonyl condensation product is chosen from the group consisting of: phenol-aldehyde condensation products and phenol-ketone condensation products.

7 . The method according to claim 1 , wherein the phenol-carbonyl condensation product has an average molecular weight comprised between 500 and 3000 g/mol.

8 . The method according to claim 1 , wherein the phenol-carbonyl condensation product is a novolac resin or a resole resin.

9 . The method according to claim 1 , wherein the composition comprises from 0.1% to 30% by weight, preferably from 1 to 20% by weight, of the phenol-carbonyl condensation product relative to the total weight of the polyamide and the phenol-carbonyl condensation product.

10 . The method according to claim 1 , wherein the composition comprises from 70% to 99.9% by weight, preferably from 80 to 99% by weight, of the polyamide relative to the total weight of the polyamide and the phenol-carbonyl condensation product.

11 . The method according to claim 1 , wherein the composition comprises a reinforcing filler.

12 . The method according to claim 1 , wherein the composition comprises a reinforcing and/or bulking filler selected from the group consisting of: glass fibers, carbon fibers, glass beads, aramid fibers, clays, kaolin, mica, wollastonite, silica, talc, graphite, calcium carbonate, calcium phosphate, silicon carbide and nanoparticles.

13 . The method according to claim 1 , wherein the composition comprises at least one additive chosen from the group consisting of: toughening agents, such as functionalized polyolefins or rubbers, thermal stabilizers, UV stabilizers, chain extenders, lubricants, processing aids, pigments and colorants.

14 . An article manufactured from a composition comprising at least one polyamide and at least one phenol-carbonyl condensation product, the article having a shape that permits it to contain, store and/or transport a liquid.

15 . The article according to claim 14 , wherein the article is selected from the group consisting of metering device, drum, pump, pipe, container, reservoir, tank, vessel, bottle, box, hose, duct and tube.

16 . The article according to claim 14 , wherein the article is produced by injection molding, by extrusion or by blow molding.

17 . (canceled)

18 . (canceled)