Method of forming a lightweight structural assembly by joining acrylic resin balls with a polyester or epoxy resin matrix
Abstract
Abstract Method of forming a lightweight structural assembly of high structural strength comprising, in combination, a hollow member, a filler therein of hollow plastic balls and a resinous matrix therefor of a resin selected from the group consisting of epoxy and polyester resins. The method of making the assembly uses the hollow member as the mold and effects the formation and curing of the matrix resin by the exothermic reaction between the resinforming components, thereby liberating sufficient heat to cause the plastic balls to expand and subsequently upon cooling to exhibit a stressed state than increases the structural strength of the resulting assembly. The hollow member is preferably formed of a lightweight rigid material, such as aluminum, an aluminum or magnesium alloy, or a resin, and the balls are preferably formed with thin continuous spherical walls of a polymethylmethacrylate or polymethacrylate with diameters varying from one-half to 1 3/4 inches. The balls are coated with a tacky polyester or epoxy resin prior to charging the balls into the cavity to cause the balls to become attached to one another and relatively fixed in place prior to introducing the liquid resin matrix.
Inventors
- 👤 Vance Allen Syayner
Bibliographic Details
Claims Analysis
Total Claims: 4References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |