Inorganic fillers for improving the mattness of the thermoplastic polymers
Combinations of inorganic fillers improve the mattness of thermoplastic polymer compositions, in particular of fibers produced from thermoplastic polymer compositions, and in particular the mattness of fibers of thermoplastic polymer compositions suited for flocking.
1. A thermoplastic polymer composition comprising: (a) more than 2% by weight and less than 4% by weight with respect to the total weight of the polymer composition of a combination of inorganic fillers, said combination comprising at least two inorganic fillers selected from the group consisting of zinc sulfide, titanium dioxide, silica, and barium sulphate, and (b) a thermoplastic matrix selected from the group consisting of polyesters and polyamides, other than a polymer composition having a polyester matrix and comprising a binary combination of titanium dioxide and of zinc sulfide.
2. The thermoplastic polymer composition as defined by claim 1 , said combination of inorganic fillers comprising titanium dioxide and zinc sulfide.
3. The thermoplastic polymer composition as defined by claim 1 , in which the inorganic fillers are present in binary combinations in proportions by weight ranging from 1:99 to 99:1.
4. The thermoplastic polymer composition as defined by claim 1 , in which the thermoplastic polymer comprising the thermoplastic matrix of the polymer composition comprises a polyamide.
5. The thermoplastic polymer composition as defined by claim 1 , in which the thermoplastic polymer comprising the thermoplastic matrix of the polymer composition comprises polyamide 6, polyamide 6,6, polyamide 11, polyamide 12, polyamide4, polyamides4,6, 6,10, 6,12, 6,36 and 12,12, and semi-aromatic polyamides prepared from terephthalic and/or isophthalic acid.
6. An article shaped from a thermoplastic polymer composition as defined by claim 1 .
7. An article shaped from a thermoplastic polymer as defined by claim 6 , in the form of yarns, fibers or filaments.
8. A flocked surface of high mattness comprising one or more shaped articles as defined by claim 6 .
9. The thermoplastic polymer composition as defined by claim 1 , said proportion by weight being greater than or equal to 2.5%.
10. The thermoplastic polymer composition as defined by claim 3 , said proportions by weight ranging from 20:80 to 80:20.
11. The thermoplastic polymer composition as defined by claim 1 , said proportions by weight ranging from 40:60 to 60:40.
12. The thermoplastic polymer composition as defined by claim 3 , said proportion by weight being on the order of 50:50.