Method of coating flexible substrates with polyurethane-polyurea elastomers and products produced thereby

Abstract

Process for coating flexible substrates which comprises applying a finishing polyurethane-polyurea elastomer coating to a release surface, applying an undercoat of a polyurethane-polyurea elastomer having a different composition than the finishing coating on the finishing coating and applying a flexible substrate to the undercoating. The polyurethane-polyurea elastomers used as the finishing coat are prepared by forming a polyether-polyol prepolymer in which the polyol consists essentially of a diol or a mixture of diols and which prepolymer is subsequently reacted with an aromatic diamine. The polyurethane-polyurea elastomers used to form the undercoat are obtained by reacting the aromatic diamine with a polyether-polyol prepolymer in which the polyol consists essentially of one having an hydroxyl functionality of at least 3 or a mixture of polyols in which at least one of the polyols has a hydroxy functionality greater than 2 in a sufficient amount to increase the resistance to flexing. The coated flexible substrates are useful in many areas as is known for polyurethane or polyurea coated substrates generally, but the coated flexible substrates, according to this invention, are particularly useful in the manufacture of shoe uppers.

Dependencies are inferred from the claim text.