Coating compositions of polymer dispersions in mixtures of high boiling and low boiling liquids

Claim 1

A COATING COMPOSITION ADAPTED FOR SPRAYING ONTO ARTICLES COMPRISING A DISPERSION NON-THIXOTROPIC, NONFLOCCULATED OF DISPERSED PARTICLES OF FILM FORMING POLYMER IN AN ORGANIC LIQUID IN WHICH SAID DISPERSED PARTICLES ARE INSOLUBLE, SAID ORGANIC LIQUID CONSISTING ESSENTIALLY OF A MIXTURE OF (1) A HIGH-BOILING ORGANIC LIQUID AND (2) A LOWBOILING ORGANIC LIQUID, SAID HIGH-BOILING LIQUID (1) HAVING A BOILING POINT ABOVE 150*C., SUFFERING SUBSTANTIALLY NO LOSS BY EVAPORATION ON SPRAY APPLICATION UNDER NORMAL OPERATING CONDITIONS SUCH THAT WHEN A MIXTURE OF SAID HIGH-BOILING ORGANIC LIQUID AND A NONVOLATIVE LIQUID PLASTICIZER IS SPRAY APPLIED, THE LIQUID DEPOSITED WILL BOILING LIQUID TO NONVOLATILE LIQUID CONTAIN SUBSTANTIALLY THE SAME PROPORTION OF HIGHMIXTURE WHICH IS SPRAYED, AND HAVING A SOLVATING ACTION ON SAID DISPERSED PARTICLES AT ROOM TEMPERATURE SUCH THAT IT AT LEAST SWELLS SAID PARTICLES, THE AMOUNT OF SAID HIGH BOILING LIQUID (1), RELATIVE TO THE SOLID CONTENT OF THE COMPOSITION, BEING AT LEAST 1:16 BY VOLUME. SAID LOW BOILING ORGANIC LIQUID, WHEN SPRAY APPLIED UNDER NORMAL OPERATING CONDITIONS TO AN ARTICLE TO BE COATED, BEING EVAPORATED BY THE APPLICATION SUCH THAT THE SPRAYED ARTICLE IS FOUND ON EXAMINATION IMMEDIATELY AFTER SPRAYING TO BE DRY, HAVING A BOILING POINT IN THE RANGE 60 TO 120*C., AND BEING PRESENT IN AN AMOUNT AT LEAST SUFFICIENT THAT THE TOTAL ORGANIC LIQUID WHICH CONSISTS ESSENTIALLY OF SAID HIGH AND LOW-BOILING ORGANIC LIQUIDS IS A NON-SOLVENT FOR SAID DISPERSED PARTICLES, WHEREBY SAID TOTAL ORGANIC LIQUID DOES NOT SWELL SAID FILM FORMING POLYMER AT ROOM TEMPERATURE NOTWITHSTANDING THE SOLVATING ACTION OF THE HIGH-BOILING COMPONENT (1).