This invention relates to molding compositions comprising mixtures of wholly aromatic polyesters and fillers. These compositions can be molded, with minimal processing difficulties, into useful articles, such as ovenware, having good mechanical properties and pleasing visual appearances.
Excellent mold release coupled with a good retention of mechanical properties (i.e., flexural strength and flexural modulus) is made possible in the liquid-crystal polyester resin composition of the present invention, which comprises: a) 35-85 wt. % of a wholly aromatic polyester which is melt processable and which displays anisotropy in the molten state; b) 15-65 wt. % of a platelet-shaped filler having a mean particle size of less than 5 microns; and c) optionally, up to 20 wt. % titanium dioxide.
A wholly aromatic liquid crystalline polyester resin composition comprising about 97-60 parts by weight of a wholly aromatic polyester resin (A) having melting peak determined by DSC equal to or higher than 310.degree. C.; and about 3-40 parts by weight of a wholly aromatic polyester resin (B) having melting peak determined by DSC equal to or lower than 300.degree. C. is provided. The novel liquid crystalline polyester resin composition of the present invention exhibits an improved melt flowability and can provide a molded article having reflow-soldering heat resistance.
A thermoplastic bakeware article (i.e., an article formed to hold, contain or support food, while being heated in a microwave, conventional oven, convection oven, or the like) that is food-grade and resistant to dripping, stringing, and melting at high temperatures. The article has a composition comprising a partially crystalline polyester resin and a phenoxy resin. The composition is formulated so as to allow cross-linking between the polyester resin and the phenoxy resin at temperatures above about 400.degree. F.
