Back to results
US 12,091,515 B2Granted
Method of recycling high relative viscosity nylon
AssigneeInv Nylon Polymers Americas, LLC
InventorsJohn P. Poinsatte, Joshua J. Wahrmund
Life of this patent
Estimating the term…
Abstract
The disclosed method relates to a method of recycling high relative viscosity nylon. The process involves melting a base polyamide with a dry blended mixture of dicarboxylic acid and a second polyamide. The disclosed method provides a process of controlling the relative viscosity of the combined polyamides and, in various aspects, the second polyamide may be nylon plop or other polyamide having high relative viscosity.
Claims23
A method of reducing the relative viscosity (RV) of a polyamide melt, the method comprising:
- treating a first polyamide having a RV of 45 or greater with an additive mixture comprising an organic dicarboxylic acid and a second polyamide, wherein the particle size distribution of the organic dicarboxylic acid component is characterized by >94% by weight of particles scaling <710 microns, dry-blended with a second polyamide, where the second polyamide is characterized by >97 wt % of particles scaling >300 microns and ≤3 wt % of particles scaling <300 microns, and wherein greater than 50 wt % of the additive mixture is the second polyamide;
- and
- melting the first polyamide treated with the additive mixture.
Dependencies are inferred from the claim text.