Laminates of improved fire resistance
AssigneeSociete Chimique des Charbonnages S.A.
InventorsNicolas Meyer, Michel Cousin
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Abstract
There are obtained laminates of improved fire resistance comprising a substrate of reinforced phenolic resin, directly coated on at least one side thereof with a surface layer of a furan resin, and bonded to the outer surface of the furan resin a "gel-coat" of an unsaturated polyester resin, wherein the furan resin contains boron in sufficient amounts to impart an improved fire resistance to the laminates as compared to the fire resistance of the outer surface gel-coat. The boron is introduced as boric anhydride by use of a substantially anhydrous boric anhydride hardener solution to harden the furan resin.
Claims10
In a laminate having a reinforced phenolic resin substrate, a hardened furan resin layer bonded to at least one side of said substrate, and a moderately inflammable thermosetting unsaturated polyester resin layer bonded to the obverse side of said furan resin layer,
- the improvement wherein said hardened furan resin layer is hardened by using as the hardener a substantially anhydrous boric anhydride solution comprising at least 5% by weight of boric anhydride;
- whereby sufficient boron is introduced into said furan resin layer as boric anhydride to improve the fire resistance of the laminate without requiring the incorporation of boron into the polyester resin layer.
Dependencies are inferred from the claim text.