C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
403/14, 18/644
C08K 3/00 (2006.01) B29C 44/04 (2006.01) C08J 9/00 (2006.01) C08J 9/14 (2006.01) C08J 9/34 (2006.01) C08K 5/00 (2006.01)
Patent
CA 1052049
ABSTRACT OF THE DISCLOSURE A molding composition is disclosed for forming in a single step a natural sandwich foam product having a cellular core and a thick, densified outer layer. A hard, particulate filler material such as fly ash is admixed with an unreacted, rigid polyurethane foam system, together with density distribution control agent such as carbon tetra- chloride which lowers the viscosity of the admixture. In molding, the mold cavity is charged with the admixture and the foam reaction is permitted to occur with the mold closed. The resultant, filled foam product has a thick outer layer formed adjacent the mold surface of substantially greater density than its core. In the densified layer, both the polyurethane ant filler material components of the resultant product are concentrated to provide over three times the density of the core structure. Formulations are set forth which provide substantial layer thickness and an outer sur- face having a durometer hardness value of 50 or greater over the entire surface area. If desired, one or more barrier members may be provided in the mold cavity in order to cause the generation of a densified region in the resultant product at the pressure barrier during the foam reaction, thereby reinforcing the core to increase the structural strength of the product.
169375
Baker Jerry L.
Clay Edward L.
Baker Jerry L.
Clay Edward L.
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