Flame retardant laminate of resin impregnated paper

B - Operations – Transporting – 32 – B

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154/134

B32B 27/10 (2006.01)

Patent

CA 1127952

Abstract of the Disclosure A laminated material comprises surface layers of paper impregnated with amino formaldehyde resin and inner layers of paper containing a flame retardant material and impregnated with phenol formaldehyde resin. The flame retardant material is a product of interaction of aluminium or copper compound with phosphoric acid and nitrogen bases and contains, in weight percent: P2O5 total 37 to 63 P2O5 water-soluble O to 6 NH3 3.5 to 11 MO 18 to 43 where MO is at least one metallic oxide, the flame retardant material content ranging from 4 to 8 weight percent, with the following ratio of the laminated material components, in weight percent: paper for surface layers 9 to 26 paper for inner layers 26 to 49 phenol-formaldehyde resin 16 to 30 amino-formaldehyde resin 5 to 26 The laminated material according to the invention has a combustibility index in the range of 0.1 to 0.5.

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