Patent ID: 11920009
Assignee: ADVANSIX RESINS & CHEMICALS LLC
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  D | IPC C  D

Claim 13:
14. A method of making a masterbatch polyamide polymer comprising:
providing caprolactam, a diamine, and at least one of 5-sulfoisophthalic acid and a 5-sulfoisophthalic acid salt, to a reactor;
mixing the caprolactam, the diamine, and the at least one of the 5 -sulfoisophthalic acid and the 5-sulfoisophthalic acid salt together in the reactor; and
reacting the caprolactam, the diamine, and the at least one of the 5-sulfoisophthalic acid and the 5-sulfoisophthalic acid salt within the reactor at a reaction temperature to form the masterbatch polyamide polymer, the masterbatch polyamide polymer comprising:
a residue of caprolactam;
a residue of the diamine; and
a residue of at least one of 5-sulfoisophthalic acid and a 5-sulfoisophthalic acid salt,
wherein a concentration of the residue of the at least one of 5-sulfoisophthalic acid and the 5-sulfoisophthalic acid salt is from 0.5 wt. % to 20 wt. % based on a total weight of the masterbatch polyamide polymer,
whereby the masterbatch polyamide polymer is capable of conferring stain resistance to a terminated polyamide polymer while maintaining the processability of the terminated polyamide polymer, wherein processability is defined by a melt stability within a range between 255° C. and 275° C.