Viscosity breaking process for olefin polymers
AssigneeBASF SE
InventorsDavid E. Horst, Michael Roth, Peter Nesvadba
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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.
Claims14
A method for viscosity breaking of a polypropylene polymer, a propylene copolymer or a polypropylene polymer blend,
- which method comprises
- adding a chain transfer agent and an initiator to the polypropylene polymer, propylene copolymer or polypropylene polymer blend and heating the resultant composition,
- wherein 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. and
- where the chain transfer agent is of formula R—SH where R is mercapto-C8-C20alkyl interrupted by one or more —OCO— groups.
Dependencies are inferred from the claim text.