US 20200190338Al  c19)  United States  c12)  Patent Application Publication  VAN DER NET  c10)  Pub. No.: US 2020/0190338 Al  (43)  Pub. Date:  Jun. 18, 2020  (54)  METHOD FOR PREVENTING HARDENER  COMPOUNDS TO BE FORMED FROM  HARDENER PRECURSORS AND  EXTENDING SHELF LIFE OF THE  DISPERSION  (71)  Applicant:  MASTON OY,  Veikkola (FI)  (72)  Inventor:  Hendrik VAN DER NET,  Scharnegoutum  (NL)  (73)  Assignee:  Maston Oy,  Veikkola (FI)  (21)  Appl. No.:  16/619,484  (22)  PCT Filed:  Jun. 11, 2018  (86)  PCT No.:  PCT/FI2018/050437  § 371 (c)(l),  (2) Date:  Dec. 5, 2019  (51)  Int. Cl.  (52)  U.S. Cl.  CPC ...........  C09D 51021  (2013.01);  C09D 175104  (2013.01)  (57)  ABSTRACT  (30)  Foreign Application Priority Data  Publication Classification  Jun.  9, 2017  (FI) ...................................... 20175535  A method is disclosed for preventing hardener compounds to  be formed from hardener precursors in a sealed and pres› surized aerosol can. This includes a paint forming dispersion  containing after sealing the can a liquefied propellant, epoxy  or/and polyurethane resins amount Wl, hardener precursor  of the epoxy or/and polyurethane resins amount W3, where  the epoxy or urethane hardener precursors are selected from  a group including an imine, an enamine, a Mannich base, a  Schiff’s base, an oxazolidine, an aldimine and mixtures  thereof, free water of amount Wl in a range of 1-10000 ppm,  and brought into the can alongside with the other paint  dispersion forming chemicals before sealing the can. A  catalytic compound prevents formation of the epoxy or/and  polyurethane hardener amines from the epoxy or/and poly› urethane hardener precursors:  C09D 5102  C09D 175104  (2006.01)  (2006.01)  Epoxy and/or polyurethane hardener  +  Ketones  Catalyst  Epoxy and/or polyurethane  hardener precursor  +  Free water  (amine) 