Blends of aromatic polycarbonate resin, olefin polymers or copolymers and acrylate- or methacrylate-copolymer resins

Claim 2

A thermoplastic composition, comprising an intimate blend of (a) from about 55 to about 93 parts by weight of an aromatic polycarbonate resin; (b) from about 3.5 to about 30 parts b weight of a polyolefin homopolymer an olefin copolymer or terpolymer made solely from olefin monomers or mixtures thereof; and (c) from about 3.5 to about 15 parts by weight of a third polymeric component comprising a copolymer of one or more olefins and a monomeric acrylate, methacrylate, acrylic acid or methacrylic acid, the amount of (c) being at least sufficient to impart to the blend a resistance to impact failure in thick sections greater than that possessed by (a), and a weld line impact strength better than that possessed by (a) and (b) in combination the total weight of (a), (b), and (c) combined is 100 parts.

Claim 3

A composition according to claim 1, in which the aromatic polycarbonate resin has the formula ##STR3## wherein A is a divalent aromatic radical of a dihydric phenol.

Claim 4

A composition according to claim 1, in which the aromatic polycarbonate resin has the formula ##STR4## wherein R 1 and R 2 are, independently, hydrogen, alkyl having from 1 to about 10 carbon atoms, or phenyl; X is, independently, alkyl having from 1 to about 10 carbon atoms, chloro, bromo or hydrogen; p and r are independently, from zero to 4; and n represents the total number of monomer units and is an integer of at least about 30.

Claim 5

A composition according to claim 1, in which the aromatic polycarbonate resin is poly(bisphenol A carbonate).

Claim 6

A composition according to claim 1, in which the olefin resin (b) is selected from the group consisting of polyethylene, polypropylene, polyisobutylene, a copolymer of ethylene and propylene, terpolymers of ethylene, propylene and a diene copolymer of ethylene and butene-1 and mixtures thereof.

Claim 7

A composition according to claim 1, in which component (b) comprises polypropylene.

Claim 8

A composition according to claim 6, in which component (b) comprises a terpolymer of ethylene, propylene and a diene.

Claim 9

A composition according to claim 1, in which component (b) comprises a copolymer of ethylene and propylene.

Claim 10

A composition according to claim 1, in which component (b) comprises a linear low density polyethylene.

Claim 11

A composition according to claim 1, in which component (c) comprises a copolymer of ethylene and ethyl acrylate.

Claim 12

A composition according to claim 1, in which component (c) comprises a terpolymer of ethylene, propylene and acrylic acid.

Claim 13

A composition according to claim 1, wherein a reinforcing amount of a filler is present.

Claim 14

A composition according to claim 12, wherein said filler comprises glass fiber.

Claim 15

A composition according to claim 1, wherein a flame retardant effective amount of a metal salt of an organic sulfonic acid is also present.

Claim 16

An article which has been molded from a composition according to claim 1, said article being characterized by improved resistance to environmental stress cracking and crazing in comparison with a corresponding article consisting of the aromatic polycarbonate resin alone.

Claim 17

A thermoplastic composition comprising an intimate blend of (a) from about 55 to about 93 parts by weight of an aromatic polycarbonate resin; (b) from about 3.5 to about 30 parts by weight of a polymer made solely from olefin monomers selected from the group consisting of polyolefin homopolymer, an olefin copolymer or terpolymer made solely from olefin monomers and mixtures thereof; and (c) from about 3.5 to 15 parts by weight of a third polymeric component comprising a copolymer of one or more aliphatic monoalphaolefins and a monomeric acrylate, methacrylate, acrylic acid or methacrylic acid, the amount of (c) being at least sufficient to impart to the blend a resistance to impact failure in thick sections greater than that possessed by (a), and a weld line impact strength better than that possessed by (a) and (b) in combination, the total weight of (a), (b), and (c) combined is 100 parts.

Claim 18

A thermoplastic composition comprising an intimate blend of (a) from about 55 to about 93 parts by weight of an aromatic polycarbonate resin; (b) from about 3.5 to about 30 parts by weight of a polymer made solely from olefin monomers selected from the group consisting of polyolefin homopolymer, an olefin copolymer or terpolymer made solely from olefin monomers and mixtures thereof; and (c) from about 3.5 to 15 parts by weight of a third polymeric component comprising a copolymer of one or more aliphatic monoalphaolefins and a monomeric acrylate, methacrylate, acrylic acid or methacrylic acid, the amount of (c) being at least sufficient to impart to the blend a resistance to impact failure in thick sections greater than that possessed by (a), and a weld line impact strength better than that possessed by (a) and (b) in combination, the total weight of (a), (b), and (c) combined is 100 parts.