US 11,851,563 B2
Process and formulation for producing a polyamide having low caprolactam concentration and specific relative viscosity
Jacob Ray, Pace, FL (US); Chris Schwier, Pensacola, FL (US); Douglas Claire Hoffman, Pensacola Beach, FL (US); and Muhamad Fouad, Pensacola, FL (US)
Assigned to Ascend Performance Materials Operations LLC, Houston, TX (US)
Filed by ASCEND PERFORMANCE MATERIALS OPERATIONS LLC, Houston, TX (US)
Filed on May 24, 2022, as Appl. No. 17/751,949.
Application 17/751,949 is a division of application No. 16/545,671, filed on Aug. 20, 2019, granted, now 11,345,815.
Claims priority of provisional application 62/721,259, filed on Aug. 22, 2018.
Prior Publication US 2022/0325101 A1, Oct. 13, 2022
Int. Cl. C08L 77/02 (2006.01); C08G 69/16 (2006.01); C08G 69/46 (2006.01); B01J 31/02 (2006.01); B01J 27/187 (2006.01)
CPC C08L 77/02 (2013.01) [C08G 69/16 (2013.01); C08G 69/46 (2013.01); B01J 27/187 (2013.01); B01J 31/0258 (2013.01); B01J 31/0261 (2013.01)] 15 Claims
 
1. A base polyamide composition comprising:
a nylon mixture having caprolactam units;
from 1 wppb to 50 wppm catalyst composition; and
greater than 0.75 wt % residual caprolactam, based on the total weight of the base polyamide composition;
wherein the base polyamide composition has a delta end group level ranging from 30 μeq/gram to 90 μeq/gram.