Impact resistant blend and method for making it

Claim 2

A blend characterised in that it comprises: (a) polyester resin, (b) polycarbonate resin, and (c) graft copolymer of at least one polar monomer on an ethylene-propylene or ethylene-propylene-non- conjugated diene rubber spine, the proportions of (a), (b) and (c) expressed in parts by weight per 100 parts of (a), (b) and (c) being as follows: (a) 20-90 (b) 5-60 (c) 5-50 the said polar monomer being selected from one or more of styrene, acrylonitrile and methyl methacrylate, in an amount of about 5-75% by weight of the graft copolymer (c).

Claim 3

A blend according to claim 1 characterised in that (a) is poly(1,4-butylene terephthalate), and the proportions of (a), (b) and (c) are as follows:- (a) 40-80 (b) 10-30 (c) 10-50

Claim 4

A blend according to claim 1 or 2 characterised in that the grafting monomer amounts to 5-75% by weight of (c) and the proportions of (a), (b) and (c) are as follows: (a) 60-80 (b) 10-20 (c) 10-20

Claim 5

A blend according to any of the preceding claims characterised in that (c) is a graft of styrene/ acrylonitrile, styrene/methyl methacrylate, or methyl methacrylate on ethylene-propylene-non-conjugated diene terpolymer rubber.

Claim 6

A blend according to any of the preceding claims characterised in that the non-conjugated diene is ethylidene norbornene.

Claim 7

A blend according to any of the preceding claims characterised in that the grafting monomer is styrene/ acrylonitrile, styrene/methyl methacrylate, or methyl methacrylate.

Claim 8

A blend characterised in that it comprises (a) polyester resin (b) polycarbonate resin, and (c) graft copolymer of at least one polar monomer on an ethylene-propylene or ethylene-propylene-nonconjugated diene rubber spine, the proportions of (a), (b) and (c) expressed in parts by weight per 100 parts of (a), (b) and (c) being as follows: (a) 20-90 (b) 5-60 (c) 5-50 the said polar monomer being present in an amount of 30-70% by weight of (c), and the graft copolymer (c) having been worked under shearing and fluxing conditions to disperse the rubber portion of the graft within the resinous portion thereof.

Claim 9

A blend characterised in that it comprises (a) polyester resin (b) polycarbonate resin, and (c) graft copolymer of at least one polar monomer on an ethylene-propylene or ethylene-propylene-nonconjugated diene rubber spine, the proportions of (a), (b) and (c) expressed in parts by weight per 100 parts of (a), (b) and (c) being as follows: (a) 20-90 (b) 5-60 (c) 5-50 the said polar monomer being present in an amount of 30-70% by weight of (c), and the graft copolymer (c) having been worked under shearing and fluxing conditions to disperse the rubber portion of the graft within the resinous portion thereof.