US 9,809,699 B2
Alternative methods to control crosslinking in high impact polystyrene
Giovanni Trimino, Houston, TX (US); Carlos DeAnda, Houston, TX (US); and David W. Knoeppel, League City, TX (US)
Assigned to Fina Technology, Inc., Houston, TX (US)
Filed by FINA TECHNOLOGY, INC., Houston, TX (US)
Filed on Oct. 30, 2015, as Appl. No. 14/927,528.
Prior Publication US 2017/0121501 A1, May 4, 2017
Int. Cl. C08L 25/06 (2006.01); C08K 5/524 (2006.01); C08L 51/00 (2006.01); C08L 51/04 (2006.01); C08K 5/105 (2006.01); C08K 5/17 (2006.01); C08K 5/20 (2006.01); C08K 5/3492 (2006.01); C08K 5/353 (2006.01)
CPC C08K 5/524 (2013.01) [C08K 5/105 (2013.01); C08K 5/17 (2013.01); C08K 5/20 (2013.01); C08K 5/3492 (2013.01); C08K 5/353 (2013.01); C08L 25/06 (2013.01); C08L 51/003 (2013.01); C08L 51/04 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A process comprising:
providing a polymerization system comprising a polymerization reactor upstream of a devolatilizer;
forming a high impact polystyrene within the polymerization reactor;
sending the high impact polystyrene to the devolatilizer, wherein the high impact polystyrene contains oxidizing agents;
adding a chemical retarder to the polymerization system at or upstream of the devolatilizer, wherein the chemical retarder comprises an antioxidant having a hindered phenol structure and an aliphatic amine group; and
adding a fluorescent whitening agent to the polymerization system at or upstream of the devolatilizer.