Polyisocyanate modified plural coat system for leather

Claim 1

A METHOD OF PRODUCING A COATED LEATHER COMPRISING REACTING IN AN ORGANIC SOLVENT (A) A MEMBER OF THE GROUP CONSISTING OF (1) A FILM-FORMING ADDITION POLYMER FORMED EXCULSIVELY OF AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE, VINYL ACETATGE, VINYL PROPIONATE, VINYLIDENE CHLORIDE, ACRYLONITRILE, METHACRYLONITRILE, AND ALKYL ESTERS OF AN ACID SELECTED FROM THE GROUP CONSISTING OF ACRYLIC AND METHACRYLIC ACIDS AND (2) A POLYMERIC PLASTICIZER SELECTED FROM THE GROUP CONSISTING OF POLYESTER CONDENSATES OF A DICARBOXYLIC ACID AND A POLYHYDRIC ALIPHATIC ALCOHOL HAVING 2 TO 12 CARBON ATOMS, SAID MEMBER CONTAINING REACTIVE GROUPS SELECTED FROM HYDROXYL, MERCAPTO, CARBOXYL, AND AMINO AND AMIDE GROUPS CONSISTING AT LEAST ONE REACTIVE GROUPS SELECTED FROM THE NITROGEN ON SUCH GROUPS, WITH (B) AN AMOUNT OF A POLYISOCYANTE MORE THAN THAT EQUIVALENT TO THE REACTIVE ISOCYANATE GROUPS REMAIN UNREACTED, SAID POLYISOCYANATE BEING SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC AND AROMITIC HYDROCARBON DILSOCYANATES AND TRIISOCYANTES AND AROMATIC HYDROCARBON DIISOCYANATES SUBSITUATED ON THE AROMATIC RING BY ALKOXY GROUPS, ADDING THE RESULTING SOLUTION TO A SOLUTION IN AN ORGANIC SOLVENT OF A FILMFORMING ADDITION POLYMER FORMED EXCLUSIVELY OF AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE, VINYL ACETATE, VINYL PROPIONATE, VINYLIDENE CHLORIDE, ACRYLONITRILE, METHACRYLONITRILE, AND ALKYL ESTERS OF AN ACID SELECTED FROM THE GROUP CONSISTING OF ACRYLIC AND METHACRYLIC ACIDS CONTAINING A DISPERSED PIGMENT TO FORM A DISPERSION COMPRISING PER 100 PARTS OF ADDITION POLYMER, 20 TO 100 PARTS BY WEIGHT OF THE AFORESAID PLASTICIZER, AND 5 TO 1000 PARTS OF PIGMENT, SAID DISPERSIN ALSO COMPRISING 1 TO 65 PARTS OF A POLYISCYANATE SELECT FORM THE AFORESAID GROUP THEREOF IN REACTED FORM PER 100 PARTS OF THE TOTAL OF ADDITION POLYMER AND PLASTICIZER, APPLYING SAID DISPERSIN TO A LEATHER, AND DRYING THE COATED LEATHER AT A TEMPERATURE OF AT LEAST ABOUT 20* C. WHILE REACTING ONLY A PORTION OF THE ISOCYANTE SELECTED FROM HOURS OF THE APPLICATION OF THE AFORESAID DESPERSION AND BEFORE THE ISCYANATE GROUPS HAVE BEEN COMPLETELY REACTED, APPLYING AS A FINAL COAT ON THE COAT LEATHER A COMPOSITION CONSISTINGG ESSENTIALLY OF AN ORGANIC SOLVENT IN WHICH THERE IS DISSOLVED (1) A FILM-FORMING ADDITION POLYMER FORMED EXCLUSIVELY OF AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF VINYL-ACETATE VINYL PROPIONATE, VINYLIDENE CHLORIDE, ACRYLONITRILE, METHACRYLONITRILE, AND ALKYL ESTERS OF AN ACID SELECTED FROM THE GROUP CONSISTING OF ACRYLIC AND METHACRYLIC ACIDS, AND (2) 15 TO 80 PARTS, PER 100 PARTS OF THE ADDITION POLYMER THE GROUP CONSISYING OF POLYESTER CONDENSATES OF A DICARBOXYLIC ACID AND A POLYHYDRIC ALIPHATIC ALCOHOL HAVING 2 TO 12 CARBON ATOMS, AND THEN DRYING THE COATED LEATHER AT A TEMPERATURE AT LEAST AS HIGH AS NORMAL ROOM TEMPERATURE TO SIMULTANEOUSLY EFFECT REACTION OF THE PARTIALLY REACTED POLYISOCYANATE WITH ONE OF THE POLYMERIC COMPONENTS OF THE FINAL COAT