Water-Based Aerosol Paint

Abstract

A water-based paint composition for pressurized, sealed aerosol can, and method to make same is disclosed. The composition contains up to 24% w/w propellant gas dimethyl ether (DME); up to 76% w/w coating material, consisting of 65-95% w/w nonvolatile content and 5-35% w/w volatile content. The volatile content contains 0-100% w/w water and additives, co-solvents and dispersing agents comprising altogether of 0-6% w/w volatile liquids, having 0-10% w/w, preferably 0-5% w/w volatile organic compounds (VOC) provided that the aggregate amount of DME and the VOC in volatile liquids remains below about 24% w/w calculated as DME, and nonvolatile content comprises 0-30% w/w color pigments and optional fillers, 45-99% w/w polyurethane modified alkyd resin or alkyd resin and additives up to 9% w/w. The resin is present as emulsified dispersion in water miscible preferably up to 5% w/w solvent comprising water and DME.

1 . A water-based paint composition to be used in a pressurized and sealed aerosol can, comprising:
 A) up to 24% w/w of propellant gas which is dimethyl ether (DME);   B) up to 76% w/w of a coating material, comprising nonvolatile content in a range of 65-95% w/w and a volatile content in a range of 5-35% w/w;   wherein the volatile content contains water up to 0-100% w/w, and additives, co-solvents and dispersing agents which comprise altogether of 0-9% w/w of volatile liquids, having 0-10% w/w, preferably less than 5% w/w of volatile organic compounds (VOC), provided that an aggregate amount of dimethyl ether (DME) and volatile organic compounds (VOC) in volatile liquids is such that VOC concentration is below a value corresponding to about 24% w/w, calculated as DME; and   the nonvolatile content comprises color pigments and optional fillers in a range of 0-30% w/w, polyurethane modified alkyd resin or alkyd resin in a range of 25-99% w/w, preferably in a range of 35-90% w/w and additives up to 9% w/w, which resin is present as an emulsified dispersion in water miscible solvent comprising water and dimethyl ether (DME).   
     
     
         2 . The water-based aerosol paint composition of  claim 1 , consisting of dimethyl ether (DME) up to 24% w/w, polyurethane modified alkyd resin or alkyd resin in a range of 30-65% w/w, additives and dispersing agents in a range of 0-2% w/w, color pigments, fillers and mattening agents in a range of 0-20% w/w, and the rest being water. 
     
     
         3 . The water-based aerosol paint composition of  claim 1  consisting of dimethyl ether (DME) up to 24% w/w, polyurethane modified alkyd resin or alkyd resin in a range of 30-65% w/w, additives and dispersing agents in a range of 0-2% w/w, and the rest being water. 
     
     
         4 . The water-based aerosol paint composition of  claim 1 , wherein the dry weight is in a range of 40-45% of the nonvolatile content and 30-37%, preferably 32-35% w/w from a total weight of the aerosol paint. 
     
     
         5 . The water-based aerosol paint of  claim 2 , wherein pigments contain TiO 2 . 
     
     
         6 . The water-based aerosol paint composition of  claim 1 , wherein the polyurethane modified alkyd resin or alkyd resin is at least one resin selected from the groups a)-f):
 a) saponified/neutralized short oil alkyd which is water dilutable/emulsifiable having less than 40% of fatty acids,   b) saponified/neutralized medium oil alkyd which is water dilutable/emulsifiable having 40-60% of fatty acids,   c) emulsified/dispersed short oil alkyd having less than 40% of fatty acids,   d) emulsified/dispersed medium oil alkyd having 40-60% of fatty acids,   e) emulsified/dispersed polyurethane modified alkyd being chained with mid oil having 40-60% of fatty acids,   f) emulsified/dispersed polyurethane modified alkyd being chained with short oil having less than 40% of fatty acids.   
     
     
         7 . The water-based aerosol paint composition of  claim 1 , wherein the water-miscible solvent consists of water and dimethyl ether. 
     
     
         8 . The water-based aerosol paint composition of  claim 1 , wherein the water miscible solvent does not contain any organic co-solvent. 
     
     
         9 . A method for preparing a water-based paint with a high dry weight and a lowered amount of volatile organic compounds (VOC) into a pressurized and sealed aerosol can, comprising:
 filling an aerosol can with the coating material defined in  claim 1 ;   closing the can; and   filling the closed can with liquefied propellant dimethyl ether (DME).   
     
     
         10 . A method for preparing a water-based aerosol paint with a high dry weight and a lowered amount of volatile organic compounds (VOC) comprising:
 filling an aerosol can with a coating material comprising resin in a range of 50-65% w/w, additives and dispersing agents in a range of 0-2% w/w, color pigments, fillers in a range of 0-20% w/w the rest of the coating material being water, and   then filling the closed can with liquefied propellant dimethyl ether (DME), wherein the   resin is an alkyd resin or urethane modified alkyd resin selected from the following groups (a)-(f):   a) saponified/neutralized short oil alkyd which is water dilutable/emulsifiable having less than 40% of fatty acids,   b) saponified/neutralized medium oil alkyd which is water dilutable/emulsifiable having 40-60% of fatty acids,   c) emulsified/dispersed short oil alkyd having less than 40% of fatty acids,   d) emulsified/dispersed medium oil alkyd having 40-60% of fatty acids,   e) emulsified/dispersed polyurethane modified alkyd being chained with mid oil and having 40-60% of fatty acids and   f) emulsified/dispersed polyurethane modified alkyd being chained with short oil and having less than 40% of fatty acids, wherein the   the quality of liquid additives, dispersing agents, color pigments, fillers and mattening agents and their amount is selected so, that their aggregate amount of volatile organic compounds will make less than 3%, and   the amount of DME to be added into can is less than 24% w/w of the total amount of the water-based aerosol paint.   
     
     
         11 . The method of  claim 10 , wherein resin is selected so that shelf life of the water-based aerosol paint is several months.