Patent ID: 6136920
Filing Date: 2000-10-24
Classification: C08L

Abstract:
A process for preparing a multiphase thermoplastic composition comprising a mixture (I) that includes at least one ethylene polymer (A) which has units derived from unsaturated epoxy monomers or from unsaturated acid anhydride monomers, and at least one thermoplastic polyamide resin (B) which is partially encapsulated by the said ethylene polymer (A), the said mixture (I) being dispersed in a matrix that includes at least one thermoplastic polyamide or polyester resin (C), wherein the respective melting temperatures of said thermoplastic resins (B) and (C) are such that thermoplastic resin (B) remains partially encapsulated by ethylene polymer (A) during the manufacture or use of the said composition, which process comprises the steps:producing a mixture (I) in at least the first zone of a kneading tool provided with at least two feed zones,moving said mixture (I) upstream from said first zone, and subsequently introducing the thermoplastic resin (C) into a zone situated upstream of the zone for mixing the constituents (A) and (B) of the mixture (I), anddispersing the said mixture (I) in the said thermoplastic resin (C).