Nonfoaming process for the preparation of urethane laminates from fibrous materials

Claim 1

A NONFOAMING PROCESS COMPRISING (A) APPLYING ABOUT 0.5 TO 4 OUNCES BY WEIGHT OF A LIQUID ADHESIVE COMPOSITION PER SQUARE YARD TO AT LEAST ONE INTERFACIAL CONTACT SURFACE OF AT LEAST ONE OF EACH PAIR OF A PLURALITY OF LAYERS OF A PROPOSED FIBROUS MATERIAL LAMINATE TO PROVIDE A TACKY SURFACE DEPOSIT OF SAID ADHESIVE, SAID ADHESIVE COMPOSITION COMPRISING A NONAQUEOUS SOLUTION OF AT LEAST ABOUT 35 PERCENT BY WEIGHT SOLIDS CONTENT OF A URETHANE PREPOLYMER BLOCKED WITH A BLOCKING AGENT SELECTED FROM THE GROUP CONSISTING OF IMINES, OXIMES AND KETOXIMES, SAID BLOCKED PREPOLYMER HAVING A MOLECULAR WEIGHT OF ABOUT 400 TO 6000 AND A RATIO OF EQUIVALENT BY WEIGHT OF ISOCYANATE OF SAID PREPOLYMER TO EQUIVALENTS BY WEIGHT OF ACTIVE HYDROGEN OF SAID BLOCKING AGENT IN THE RANGE OF ABOUT 1/1 TO 2/1 AND SUFFICIENT QUANTITIES OF AT LEAST ONE ORGANIC CROSSLINKING-CURRING AGENT TO PROVIDE A RATIO OF EQUIVALENTS BY WEIGHT OF ISOCYANATE OF SAID PREPOLYMER TO EQUIVALENTS BY WEIGHT OF ACTIVE HYDROGEN OF SAID CROSSLINKING-CURING AGENT IN THE RANGE OF ABOUT 0.5/1 TO 2.0/1, (B) NIPPING SAID LAYERS TOGETHER SO AS TO PRODUCE A SURFACE WETTING OF SAID LAYERS BY SAID ADHESIVE COMPOSITION AND THUS OCCASION A TEMPORARY FACE TO FACE ADHERENCE OF PAIRED INTERFACIAL CONTACT SURFACES AND (C) HEATING THE TEMPORARILY ADHERING LAYERS TO AN EFFECTIVE TEMPERATURE FOR AN EFFECTIVE TIME INTERVAL SO AS TO AT LEAST SUBSTANTIALLY REMOVE THE SOLVENT THEREFROM, UNBLOCK THE PREPOLYMER AND CURE THE UNBLOCKED PREPOLYMER WITH SAID CROSSLINKING CURING AGENT TO EFFECT A PERMANENTLY BONDED LAMINATE.