Novel thermoplastic polyester compositions containing certain low molecular weight depoxide resins and having improved impact behaviour

Claim 2

A thermoplastic polyester composition having improved impact strength comprising a blend of: (a) at least about 20 weight percent poly (C 2 -C 4 alkylene terephthalate); (b) between about 0.1 and about 8 weight % based on poly (C 2 -C 4 alkylene terepthalate) of a diepoxide resin having a molecular weight between about 350 and about 2,100 and consisting essentially of at least one condensation product of bisphenol A or brominated bisphenol A and epihalohydrin and represented by the general formula (I): wherein X is bromine or hydrogen and n is an average number above zero and less than about 2.3; (c) a catalytic amount of at least one catalyst selected from the group consisting of alkyl triphenyl phosphonium halides and alkenyl triphenyl phosphonium halides; and (d) between about 5 and about 30 weight % based on poly (C 2 -C 4 alkylene terephthalate) of a butadiene-based multi- phase composite polymer.

Claim 3

A composition according to claim 1 wherein the thermoplastic polyester composition includes at least about 60 weight percent polybutylene terephthalate having an intrinsic viscosity between about 0.4 and about 1.3 dl/g.

Claim 4

A composition according to claim 1 further containing between about 1 and about 100 weight percent based on polyalkylene terephthalate of glass reinforcing fibers.

Claim 5

A composition according to claim 1 further containing from about one to 200 weight percent based on polyalkylene terephthalate of aromatic polycarbonate.

Claim 6

A composition according to claim 1 further containing from about one to 200 weight percent based on polyalkylene terephthalate of polyarylate. #

Claim 7

A composition according to claim 1 wherein the butadiene-based multiphase polymer has an elastomeric core of polybutadiene or polybutadiene/styrene and a thermoplastic shell of polymethylmethacrylate.

Claim 8

A composition according to claim 1 further containing between about one and about 100 weight percent based on polyalkylene terephthalate of inert filler.

Claim 9

A composition according to claim 1 further containing up to twenty-five weight percent based on polyalkylene terephthalate of flame retardant additive.

Claim 10

A thermoplastic polyester composition having improved impact strength consisting essentially of a blend of: (a) at least about 60 weight percent polybutylene terephthalate having an intrinsic viscosity between about 0.5-1.0 dl/g; (b) between 1.5 and 2.0 weight % based on polybutylene terepthalate of a diepoxide resin having a molecular weight between 370 and 400 and consisting essentially of at least one condensation product of bisphenol A and epichlorohydrin and represented by the general formula (I): wherein n is an average number above zero and less than about 2.3; (c) a catalytic amount of at least one catalyst selected from the group consisting of allyl triphenyl phosphonium bromide and alkenyl triphenyl phosphonium bromide; and (d) between about 5 and about 30 weight % based on polybutylene terephthalate of a butadiene-based multi-phase composite polymer having an elastomeric core of polybutadiene or polybutadiene/styrene and a thermoplastic shell of polymethylmethacrylate.

Claim 11

A thermoplastic polyester composition having improved impact strength consisting essentially of a blend of: (a) at least about 60 weight percent polybutylene terephthalate having an intrinsic viscosity between about 0.5-1.0 dl/g; (b) between 1.5 and 2.0 weight % based on polybutylene terepthalate of a diepoxide resin having a molecular weight between 370 and 400 and consisting essentially of at least one condensation product of bisphenol A and epichlorohydrin and represented by the general formula (I): wherein n is an average number above zero and less than about 2.3; (c) a catalytic amount of at least one catalyst selected from the group consisting of allyl triphenyl phosphonium bromide and alkenyl triphenyl phosphonium bromide; and (d) between about 5 and about 30 weight % based on polybutylene terephthalate of a butadiene-based multi-phase composite polymer having an elastomeric core of polybutadiene or polybutadiene/styrene and a thermoplastic shell of polymethylmethacrylate.

Claim 12

A composition according to claim 9 further containing between about 5 and about 100 weight percent based on polybutylene terephthalate of glass reinforcing fibers.

Claim 13

A composition according to claim 9 further containing from about one to 200 weight percent based on polybutylene terephthalate of aromatic polycarbonate.

Claim 14

A composition according to claim 9 further containing from about one to 200 weight percent based on polybutylene terephthalate of polyarylate.