Articles obtained from a polymer composition, preparation process and uses

1 . An article formed from a molten polymer composition, said composition comprising, relative to the total weight of polymer in said polymer composition, at least 70% by weight of polyamide 10,6 having a number-average molecular weight of greater than 12,000 g/mol.

2 . The article as claimed in claim 1 , wherein the number-average molecular weight, Mn, (expressed in g/mol), of the polyamide 10,6 is calculated by the equation:

Mn

=

2





000





000

∑

i





GT

i

-

∑

j



(

f

j

-

2

)

×

P

j

,

wherein GT i is the concentration (expressed in meq/kg of polymer) of end groups of type i of the polyamide, and P j is the concentration of polyfunctional species j (expressed in meq/kg of polyamide), f j is equal to the number of reactive functions per polyfunctional species j, and wherein the GT i and P j are determined, depending on the nature of the species i and j by the ratio between the initial molar amount of the species introduced into the polymerization and the amount by weight of polyamide produced or, if species i is an amine or a carboxylic acid, by potentiometry.

3 . The article as claimed in claim 1 wherein the polyamide 10,6 is the only polymer present in the polymer composition.

4 . The article as claimed in claim 1 , wherein said polyamide 10,6 has a number-average molecular weight of greater than 15,000 g/mol.

5 . The article as claimed in claim 1 , wherein the polymer composition comprises at least one heat, light or ultraviolet stabilizer.

6 . The article as claimed in claim 5 , wherein the heat, light or ultraviolet stabilizer is selected from: copper compounds such as Cul/Kl mixtures, phosphites, hindered amines, hindered phenol compounds, polyhydric alcohols, elemental iron, zinc oxide and mixtures thereof in any proportion.

7 . The article as claimed in claim 1 , wherein the heat, light or ultraviolet stabilizer represents between 0.02% and 5% by weight of the total weight of the polymer composition.

8 . The article as claimed in claim 1 , wherein the article is a molded or extruded article.

9 . The article as claimed in claim 8 , wherein the article is an article molded by injection molding, injection blow molding, rotomolding, or by impregnation of a glass fiber or carbon fiber fabric.

10 . The article as claimed in claim 8 , wherein the article is an extruded or extruded-blow molded article selected from the group consisting of: a hollow body, a tube, a strip, a film, a fiber, a yarn, and a filament.

11 . A woven, nonwoven or knitted part comprising at least one fiber, one yarn or one filament as claimed in claim 10 .

12 . A process for preparing an article as defined in claim 1 , comprising:

a. mixing, adipic acid, 1,10-diaminodecane and water to obtain an aqueous solution of 1,10-decamethylene diammonium adipate salt at a concentration of from 30% to 85% by weight,

b. polymerizing the decamethylene diammonium adipate salt solution resulting from step a by polycondensation,

c. optionally, granulating the polymer obtained in step b

d. optionally, remelting granules of polymer resulting from step c with polymeric or non-polymeric fillers and/or additives,

e. optionally, granulating the polymer composition formed in step d and

f. shaping the polymer composition in molten form.

13 . The process as claimed in claim 12 , wherein the aqueous solution of 1,10-decamethylene diammonium adipate salt has a concentration of between 50% and 60% by weight.