Impact resistant polycarbonate blend

Claim 2

A process for preparing a thermoplastic molding composition, comprising: A. blending, without pre-drying, a mixture comprising: (i) about 5% to about 95%, based upon total weight, of an aromatic polycarbonate; (ii) about 5% to about 90%, based upon total weight, of an aromatic polyester; and (iii) about 0.1% to about 20%, based upon total weight, of a polyalkyleneoxide rubber; and B. extruding, without pre-drying, the blend obtained in Step A.

Claim 3

A process for preparing a thermoplastic molding composition, comprising: A. blending, without pre-drying, a mixture comprising: (i) about 40% to about 85%, based upon total weight, of an aromatic polycarbonate characterized at least in part by repeated units corresponding to the general formula: ##STR5## wherein X is a divalent C 1 -C 15 hydrocarbon radical, a single bond, --O--, --S--, --S 2 --, --SO--, --SO 2 -- or --CO--, and further wherein each aromatic ring may optionally contain 1 or 2 C 1 -C 4 hydrocarbon radical or halo radical constituents; (ii) about 15% to about 60%, based upon total weight, of an aromatic polyester characterized at least in part by repeated units corresponding to the general formula: ##STR6## wherein n is selected from the numbers 2 through 6; and (iii) about 1% to about 10%, based upon total weight, of a polyalkyleneoxide rubber prepared by polymerizing: (a) one or more alkylene oxides of the general formula: ##STR7## wherein each R 1 is independently a C 1 -C 10 alkyl or alkylene, or halo substituted alkyl or alkylene hydrocarbon radical, or a hydrogen atom; and optionally (b) epoxide-containing monomers of the general formula: ##STR8## wherein each R 2 is independently hydrogen, or a C 1 -C 10 alkyl, alkenyl, alkoxy alkyl or alkoxy carbonyl radical, or halo substituted alkyl, alkenyl, alkoxy alkyl or alkoxy carbonyl radical; and B. extruding, without pre-drying, the blend obtained in Step A.

Claim 4

A process for preparing a thermoplastic molding composition, comprising: A. blending, without pre-drying, a mixture comprising: (i) about 40% to about 85%, based upon total weight, of an aromatic polycarbonate characterized at least in part by repeated units corresponding to the general formula: ##STR5## wherein X is a divalent C 1 -C 15 hydrocarbon radical, a single bond, --O--, --S--, --S 2 --, --SO--, --SO 2 -- or --CO--, and further wherein each aromatic ring may optionally contain 1 or 2 C 1 -C 4 hydrocarbon radical or halo radical constituents; (ii) about 15% to about 60%, based upon total weight, of an aromatic polyester characterized at least in part by repeated units corresponding to the general formula: ##STR6## wherein n is selected from the numbers 2 through 6; and (iii) about 1% to about 10%, based upon total weight, of a polyalkyleneoxide rubber prepared by polymerizing: (a) one or more alkylene oxides of the general formula: ##STR7## wherein each R 1 is independently a C 1 -C 10 alkyl or alkylene, or halo substituted alkyl or alkylene hydrocarbon radical, or a hydrogen atom; and optionally (b) epoxide-containing monomers of the general formula: ##STR8## wherein each R 2 is independently hydrogen, or a C 1 -C 10 alkyl, alkenyl, alkoxy alkyl or alkoxy carbonyl radical, or halo substituted alkyl, alkenyl, alkoxy alkyl or alkoxy carbonyl radical; and B. extruding, without pre-drying, the blend obtained in Step A.

Claim 5

The process for preparing the thermoplastic molding composition of claim 2, wherein: A. the aromatic polycarbonate is prepared at least in part from Bisphenol A; B. the aromatic polyester comprises at least in part polyethylene terephthalate; and C. the polyalkyleneoxide rubber comprises a copolymer prepared from propylene oxide and allyl glycidyl ether.

Claim 6

A process according to claim 1 wherein the mixture additionally comprises less than about 40%, based upon total weight, of a grafted copolymer or mixture of grafted copolymers.

Claim 7

A process according to claim 2 wherein the mixture additionally comprises less than about 30%, based upon total weight, of a grafted copolymer, or mixture thereof, comprising: A. about 5% to about 95% by weight of an elastomeric rubber core; and B. about 5% to about 95% by weight of either a rigid grafted-on thermoplastic shell or a grafted-on thermoplastic polymer matrix.

Claim 8

A process according to claim 5 wherein the grafted copolymer is of the core-shell type comprising a MBS (methyl methacrylate/butadiene/styrene) rubber, a butyl acrylate core-rigid shell copolymer, an ABS (acrylonitrile/butadiene/styrene) copolymer, a butadiene/styrene/acrylonitrile core-shell copolymer, or a mixture thereof.