Impact modified polyamide/polycarbonate

Claim 2

A thermoplastic blend comprising: (a) an aromaric polycarbonate resin; (b) an amorphous polyamide resin; and (c) an impact-modifying proportion of a polyamide-polyether block copolymer.

Claim 3

A thermoplastic blend as in claim 1 wherein the polycarbonate resin contains structural units of the formula: ##STR14## wherein D is divalent aromatic radical.

Claim 4

A thermoplastic blend as in claim 2 wherein aromatic polycarbonate resin comprises polymers selected from the group consisting of poly(ester-carbonate)polymers.

Claim 5

A thermoplastic blend as in claim 2 wherein the aromatic polycarbonate is obtained by polymerizing phosgene with 2,2-bis(4-hydroxyphenyl) propane.

Claim 6

A thermoplastic blend as in claim 4 wherein the aromatic polycarbonate is obtained by polymerizing phosgene with 2,2-bis(4-hydroxyphenol) propane and a mixture of isophthalic and terephthalic acids.

Claim 7

A thermoplastic blend as in claim 1 wherein said amorphous polyamide is substantially free of amine end-groups.

Claim 8

A thermoplastic blend as in claim 1 wherein the ratio of amorphous polyamide to polycarbonate falls within the range of 10:90 to 90:10.

Claim 9

A thermoplastic blend as in claim 1 wherein the amorphous polyamide contains structural units selected from those of the formula: ##STR15## wherein R 1 and R 2 are different divalent organic radicals selected from the group consisting of C 2 -C 15 alkylene radicals C 3 -C 18 cycloalkylene radicals and C 6 to C 20 arylene radicals.

Claim 10

A thermoplastic blend as in claim 8 wherein the amorphous polyamide is obtained by polymerization of members selected from the group consisting of (a) terephthalic acid with, trimethylhexamethylene diamine; (b) isophthalic acid with trimethylhexamethylene diamine; (c) adipic acid, azelaic acid and 2,2-bis-(p-aminocyclohexyl) propane; (d) terephthalic acid with bis (4-amino cyclohexyl) methane; (e) isophthalic acid with hexamethylenediamine; (f) terephthalic acid/isophthalic acid with hexamethylene diamine, and (g) adipic acid/azelaic acid with diphenyl methane diisocyanate.

Claim 11

A thermoplastic blend as in claim 1 wherein the polyamide-polyether block copolymer possesses recurring chain units of the formula: ##STR16## wherein PA represents a saturated amide sequence formed from a lactam or an amino acid having a hydrocarbon chain containing from 4 to 14 carbon atoms, inclusive, or from a dicarboxylic acid and a diamine wherein both can have from 4 to 40 carbon atoms, inclusive; and PE represents a polyether sequence formed from a polyoxyalkylene glycol.

Claim 12

The blend of claim 10 wherein the proportion by weight of the polyoxyalkylene glycol sequence to the total weigh of the block copolymer is from 5 to 85 percent.

Claim 13

A thermoplastic blend as in claim 1 wherein the impact-modifying proportion is from 5 to 30 weight percent of the blend.

Claim 14

An article molded from the composition of claim 1.