Abstract: Compositions comprising polyetherester resins, polyetherimide ester resins, alone or combined with polyester resins, and mixtures of any of them or of polyester resins alone with copolymers of alpha-olefins and vinyl esters of aliphatic monocarboxylic acids have improved elastomeric character. For example, addition of 50 and 30 parts by weight of a vinyl acetate-ethylene copolymer having a high content of units derived from vinyl acetate to a polyetherimide ester copolymer considerably improves compressibility, elasticity, low temperature impact strength, UV light resistance and chemical resistance. Articles shaped from such compositions show desirably lower hardness, improved dynamic fatigue properties, paintability, extrudability and injection moldability.

Abstract: A structural panel is of sandwich construction including upper and lower face sheets bonded to a central core. The latter is formed of a plurality of extrusion products disposed in abutting relationship, with each product being a unitary piece of longitudinally extending extrusion material having a matrix of interior walls which define the interior portion of each piece into a regular array of hexagonally-shaped apertures. The longitudinal axes of said apertures extend generally perpendicular to the planes of the upper and lower cover sheets. The resulting structural panel may be readily formed into a three-dimensional shape of enhanced strength.