Viscosity breaking process for olefin polymers

US8618224B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• David E. Horst · Danbury, US
• Michael Roth · Herbstein, DE
• Peter Nesvadba · Marly, CH

Key dates

• Filing date: May 14, 2013
• Grant date: Dec 31, 2013
• Expiry date: May 14, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2023/42
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Disclosed is a method for viscosity breaking of a polypropylene polymer, a polypropylene copolymer or a polypropylene polymer blend, which process comprises adding a chain transfer agent and an initiator to a polypropylene polymer, polypropylene copolymer or polypropylene polymer blend and heating the resultant composition. The chain transfer agent has a Cs value of greater than or equal to about 0.04 as measured in ethylene polymerization at 130° C. The initiator is for example an organic or inorganic peroxide, a carbon based radical generator, a bis azo compound, a stable nitroxyl compound, a sterically hindered NO-acyl compound or a sterically hindered alkoxyamine compound.