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US 4,098,856 AGranted
Method of making a composite mold for making polyurethane foam decorative parts
AssigneeArmstrong Cork Company
InventorClifford M. Rosenau
Life of this patent
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Abstract
A method for making a composite mold utilizing room temperature vulcanizing silicone rubber for the surface of the mold and room temperature vulcanizing polyurethane rubber for the rest of the mold.
Claims3
A method of making a composite rubber mold comprising the steps of:
- (a) spraying a silicone rubber compound on the surface of a master which is to be copied;
- (b) curing the silicone rubber covering over the master to be copied to form a layer with a thickness of 0.005 to 0.020 inches;
- (c) flame treating the back surface of the silicone rubber layer to make it receptive to bonding with other materials;
- (d) forming a solid non-compressible during molding use flexible polyurethane backing layer on the silicone rubber surface;
- and
- (e) permitting the composite plural layer mold to cure so that it may be subsequently used to mold articles in the shape of a master in the mold so constructed.
3 more elements
Dependencies are inferred from the claim text.