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US 4,176,210 AGranted
Process for making urethane coated decorative sheet-type covering material
AssigneeGAF Corporation
InventorDavid B. Skinner
Life of this patent
Estimating the term…
Abstract
Decorative sheet-type covering material having both PVC and polyurethane wear layers is made by first forming a sheet of gelled foamable PVC plastisol or organosol on a substrate. A layer of nonfoamable PVC plastisol or organosol is then applied to the gelled foamable layer and gelled, but not cured. A layer of polyurethane is then applied to the gelled nonfoamable layer and the entire sheet is heated to a temperature sufficient to decompose the blowing agent in the foamable layer and cure both of the PVC layers and the polyurethane layer.
Claims5
Process for making decorative sheet-type covering material comprising the steps of:
- (a) forming sheet material comprising a layer of gelled foamable PVC plastisol or organosol on a substrate, said layer containing a blowing agent;
- (b) applying a layer of nonfoamable PVC plastisol or organosol to said gelled foamable layer;
- (c) gelling said layer of nonfoamable PVC plastisol or organosol;
- (d) applying a layer of uncured polyurethane to the gelled layer of nonfoamable PVC plastisol or organosol;
- and
- (e) then heating said sheet material to a temperature sufficient to decompose said blowing agent and cure all of said PVC and polyurethane layers.
3 more elements
Dependencies are inferred from the claim text.