Propylene polymer, process for obtaining it and use
AssigneeSolvay (Societe Anonyme)
InventorsFernand Gauthy, Eric Vandevijver, Martine Kaszacs
Life of this patent
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Abstract
Propylene polymer containing monomer units derived from at least one functional compound (A) comprising at least two vinyl unsaturations and one or a number of aromatic rings which exhibits a structural stress-hardening.
Claims32
A melt-blended polymer of propylene containing monomer units derived from at least one functional compound comprising at least two vinyl unsaturations and at least one aromatic ring which exhibits a structural stress-hardening characterized by a molten state increase in elongational viscosity during elongation or extension before melt rupture, and having an induction period for oxidation of at least 10 minutes.
A continuous process for the melt-blended preparation of a propylene polymer containing monomer units derived from at least one functional compound comprising at least two vinyl unsaturations and at least one aromatic ring which exhibits a structural stress-hardening said process comprising melt-blending a propylene polymer, at least one functional compound and a free radical generator in an extruder comprising, at its outlet, a compression zone preceding a discharge zone, in which at least one antioxidant additive is introduced into the melt at the latest before the entry of the latter into the said compression zone.
A propylene polymer prepared by melt-blending at least one propylene polymer, at least one functional compound comprising at least two vinyl unsaturations and at least one aromatic ring and at least one free radical generator in an extruder comprising, at its outlet, a compression zone preceding a discharge zone, in which at least one antioxidant additive is introduced into the melt before the entry of the melt into the said compression zone.
Dependencies are inferred from the claim text.