Abstract: A method of improving the bond between dissimilar synthetic polymeric materials, such as, for example, a vinyl resin material and a polyurethane or acrylated polyurethane resin material which comprises: including in the vinyl resin material a chemical compound possessing hydroxy, carboxy, amido, amino, imino, mercapto, or like functions containing reactive hydrogen; providing free, available isocyanate in the polyurethane or acrylated polyurethane resin material; bringing the vinyl resin material and the polyurethane or acrylated polyurethane resin material into contact; and exposing the vinyl resin material and the polyurethane, or acrylated polyurethane resin material, while in contact, to curing conditions, whereby there is sufficient chemical inter-reaction between these resin materials as to create a strong and permanent primary chemical bond therebetween, in addition to any secondary bonds, such as hydrogen bonds and/or van der Waals forces.

Abstract: Methods of forming liquid, low viscosity, low molecular weight, cross-linkable, stable polyurethane prepolymers which comprise: reacting polyisocyanates, and preferably aliphatic and cycloaliphatic diisocyanates, with polyhydroxy compounds or polyols, and preferably diols, triols, tetrols, and mixtures thereof; the polyols having a molecular weight of from about 62 to about 3000; the polyisocyanates and the polyols being added to the reaction mixture in an NCO/OH ratio in the range of from about 0.7:1 to about 6:1, and preferably from about 1.6:1 to about 4:1; the reaction taking place preferably in an inert, non-reactive organic solvent such as xylene; in the absence of any reaction catalysts, or in the presence of a relatively very low concentration of reaction catalysts of from about 0.00005% by weight to about 0.8% by weight, based on the total weight of the reaction mixture; at a reaction temperature of from about 0.degree. C. to about 70.degree. C., and preferably from about 0.degree. C. to about 40.

Abstract: In a process for manufacturing a resilient, resinous floor covering having a polyurethane surface coating, the in-line manufacturing improvement which comprises: applying to a foamable resinous sheet material a urethane coating composition having a viscosity in the range of from about 10 centipoises to about 100 centipoises, the application of the urethane coating composition being accomplished by a reverse-roll coating procedure wherein the casting ratio is in the range of from about 0.8:1 to about 1.1:1; and then, in an in-line manufacturing step, heating the coated, foamable, resinous sheet material to dry and to cure the urethane coating composition and to blow the foamable, resinous sheet material to form a resilient, resinous floor covering having a polyurethane surface coating, the curing of the urethane coating composition not being in excess of about 80% during the heating and blowing of the foamable resinous sheet material.