Shoe stiffener blanks comprising polyvinyl chloride, an impact modifier and a layer of heat activatable adhesive

Abstract

Abstract A thermoplastic shoe stiffener and stiffener blank comprising a nonfabric-containing sheet of thermoplastic polyvinyl chloride having a molding temperature of between 140* F. and 350* F. and containing an impact modifier, preferably linear polyethylene or linear-chlorinated polyethylene, in an amount between 3 and 18 percent by weight of the resin and a heat stabilizer in an amount equal to at least 1 percent by weight of the resin. The polyvinyl chloride contains a lubricant and may contain a plasticizer and filler. The stiffener is hard and tough and highly crush resistant but not brittle. It has excellent molding properties at the aforesaid temperatures, is water and mold proof, has a high flexure and tensile strength, an excellent memory for its molded shape upon deformation and an excellent recovery of its crush resistance after being crushed and then returned to its original shape. Unlike resin-impregnated fabrics, strength is not affected by the direction in which it is cut and it is equally stretchable in all directions. It is coated on one side with a layer of heat activatable adhesive and on the other side with a layer of flock or a layer of heat activatable adhesive.

Inventors

• 👤 Aaron Weinstein
• 👤 Frank Scourtas

Bibliographic Details