Appeal No. 1997-1299
Application 08/393,746
THE INVENTION
Appellants’ claimed invention is directed toward a
process for preparing a multiphase thermoplastic composition
which comprises a matrix including at least one thermoplastic
polyamide or polyester resin and, dispersed therein, at least
one ethylene polymer which has units derived from unsaturated
epoxy monomers or from unsaturated acid anhydride monomers and
which partially encapsulates at least one thermoplastic
polyamide resin. Claim 12 is illustrative and reads as
follows:
12. 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), and
dispersing the said mixture (I) in the said thermoplastic
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