(57) Process particularly suitable for sheet material of the type comprising a porous
polyurethane resin matrix, the latter containing polyester or polyethylene fibres,
and a pressed polyurethane resin cover film patterned to imitate real leather; the
said process consisting in treating the said material, inside rotary tanning drums,
with a trivalent metal salt solution which is brought up to precipitation pH level
in such a manner as to fill the pores in the said polyurethane matrix on the said
sheet material with a corresponding hydroxide, after which, the material is treated
with a dialdehyde, fireproofing, colouring and softening substances.
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