General Electric Company

Leonard R Hepp

Sterling B Brown

James L Derudder

Choong Y Han

Branched polyester compositions having high melt viscosities, especially under conditions of low shear, are prepared in a two-step method. The first step is the reaction of a linear polyester, polycarbonate or polyester-polycarbonate containing free carboxylic acid groups with a polyfunctional epoxyalkyl compound such as triglycidyl isocyanurate to form a reactive concentrate. The second step is the reaction of said reactive concentrate with a polyester, such as poly(ethylene terephthalate) or poly(butylene terephthalate), containing a measurable proportion of carboxylic acid end groups. By this two-step method, it is possible to use less epoxy compound for a given melt viscosity level than is the case when the epoxy compound is directly blended with the polyester.

Preparation of linear polyester-polyepoxide reaction products via

Metal salts are disclosed as effective to reduce Arc Track Rate in poly(1,4-butylene terephthalate) resin molding compositions.

Glass fiber reinforced polyester molding compositions containing metal

Particulate and fibrous metal are disclosed to improve the physical properties of poly(1,4-butylene terephthalate) resin molding compositions.

Titanium dioxide is disclosed to improve the comparative tracking index of flame retarded poly(1,4-butylene terephthalate) resin molding compositions.

Flame retarded polyester molding composition with improved electrical

Cuprous iodide is disclosed to improve the impact strength of flame retarded, glass reinforced, impact modified, poly(1,4-butylene terephthalate) resin molding compositions.

Flame retarded polyester resin with improved impact strength

Improved heat-resistant composition producing injection molded workpieces which are opaque and crystalline in thin, thick and large/flat parts comprise a combination consisting predominantly of poly(ethylene terephthalate) with a lesser proportion of poly(1,4-butylene terephthalate), such combination being reinforced with filamentous glass and, optionally, but preferably, containing an internal nucleating amount of sodium stearate.

Reinforced thermoplastic composition

The addition of poly(ethylene terephthalate) to core-shell resin impact modified, glass fiber and mica reinforced poly(1,4-butylene terephthalate) compositions provides articles molded therefrom with improved surface gloss, impact strength, flexural modulus, flexural strength and tensile strength. Heat distortion temperatures are elevated if not less than 2.6 nor more than 4 parts by weight of poly(1,4-butylene terephthalate) resin is present for each 1 part by weight of acrylic resin impact modifier.

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Evansville, IN, United States of America

Leonard R Hepp