Lightweight thermoplastic polyester molding compositions, methods of making the same and molded articles formed thereof

Abstract

Lightweight polyester resin molding compositions include a melt-blend of (A) between 97 to 20 parts by weight, based on 100 parts by weight of the total composition weight, of a polyester base resin, (B) between 3 to 80 parts by weight, based on 100 parts by weight of the total composition weight, of a polyolefin resin, (C) between 0.1 to 15 parts by weight, based on 100 parts by weight of the total composition weight, of a compatibilizing compound having a carbon-carbon double bond and an epoxy group in its molecule, (D) between 0.1 to 20% by weight, based on the weight of the compatibilizing compound, of a free radical initiator, and optionally, (E) up to 120 parts by weight, based on 100 parts by weight of the total composition, of a filler material. The free radical initiator is at least one compound having a one-minute half-life temperature of 130.degree. C. or greater, and is preferably pre-blended in solution form with the compatibilizing compound prior to being added to a melt of the polyester base resin and polyolefin resin. The resulting compositions may be molded to form relatively lightweight articles having minimal (if any) propensity to surface peel.

Dependencies are inferred from the claim text.