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# c19) United States c12) Patent Application Publication 

# VAN DER NET 

# (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 

## (30) Foreign Application Priority Data 

Jun. 9, 2017 (FI) ...................................... 20175535 

(51) Int. Cl. 

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## Publication Classification 

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(52) U.S. Cl. CPC ........... C09D 51021 (2013.01); C09D 175104 (2013.01) 

## (57) ABSTRACT 

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: 

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US 20200190338Al 

# c10) Pub. No.: US 2020/0190338 Al 

# (43) Pub. Date: Jun. 18, 2020 

(amine) 

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