초록 ▼

Core sandwich structure comprised of a lightweight core material in the form of a low density thermosetting resin matrix composition containing glass microballoons, particularly an epoxy resin containing glass microballoons, sandwiched between high strength fiber-thermosetting resin matrix outer she

Core sandwich structure comprised of a lightweight core material in the form of a low density thermosetting resin matrix composition containing glass microballoons, particularly an epoxy resin containing glass microballoons, sandwiched between high strength fiber-thermosetting resin matrix outer sheets, particularly woven graphite-epoxy sheets. Employing epoxy resin as the preferred thermosetting resin, the epoxy core material is B-staged, placed between sheets of pre-preg woven graphite-epoxy material, and the assembly co-cured under pressure to form the core sandwich structure.

대표청구항 ▼

A composite plastic structure consisting of a core material of a thermosetting resin containing a major volume of glass microballoons, and adjacent outer layers of a fibrous material impregnated with a thermosetting resin, wherein said resin of said core material and of said outer layers is a thermo

A composite plastic structure consisting of a core material of a thermosetting resin containing a major volume of glass microballoons, and adjacent outer layers of a fibrous material impregnated with a thermosetting resin, wherein said resin of said core material and of said outer layers is a thermosetting resin selected from the group consisting of epoxy, polyimide, polyester, polyurethane and phenolic resins, said fibrous material being selected from the group consisting of graphite, glass, boron, polyamide, polyimide and poly (paraphenyl terephthalamide) fibers and woven fibers.