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1. (WO2019001764) CURABLE AMINOPLAST ACRYLIC POLYOL COMPOSITIONS, PROCESS FOR THEIR PREPARATION AND METHODS OF USE
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What Is Claimed Is:

1. Curable aminoplast acrylic polyol composition containing, calculated as solids on all the solids of the composition,

(a) 50 to 85% by weight of at least one type of an acrylic polyol having a glass transition temperature Tg of from 15 to <50°C, an equivalent weight of hydroxyl groups on solids of from 330 to 420, a hydroxyl number on solids of from 120 to 180 mg KOH/g, and a number average of the molecular weight (Mn) of 1 ,000 to 3,000 Dalton, and

(b) 15 to 50% by weight of at least one type of an alkylated amino formaldehyde resin having a formaldehyde content in accordance with DIN EN ISO 1 1402 4.3 of less than

0.10%,

the amino compound on which at least one type of the alkylated amino formaldehyde resin is based is being selected from the group consisting of melamine, guanamine, benzoguanamine, urea, toluenesulfonamide and glycoluril, and the alkylated amino formaldehyde resin containing at least one type of alkyl groups having 1 to 12 carbon atoms, and the alkylated melamine formaldehyde resin having a ratio of the sum of hexa-alkoxy methyl melamine to the sum of penta-methoxy methyl melamine as determined by HPLC according T.T. Chang, Anal. Chem, 66, 3267-3272 (1994) of from 20 to 50, and

(c) 0.5 to 5.0% by weight of at least one type of an acidic catalyst.

2. Curable aminoplast acrylic polyol composition according to claim 1 , characterized in that it contains, calculated as solids on all the solids of the composition,

50 to 75% by weight of at least one type of an acrylic polyol.

3. Curable aminoplast acrylic polyol composition according to claim 1 or 2, characterized in that the glass transition temperature Tg of the acrylic polyol is of from 25 to 45°C.

4. Curable aminoplast acrylic polyol composition according to anyone of the claims 1 to 3, characterized in that the equivalent weight of hydroxyl groups on solids of the acrylic polyol is from 350 to 400.

5. Curable aminoplast acrylic polyol composition according to anyone of the claims 1 to

4, characterized in that the hydroxyl number on solids of the acrylic polyol is from 135 to 165 mg KOH/g.

6. Curable aminoplast acrylic polyol composition according to anyone of the claims 1 to

5, characterized in that it contains, calculated as solids on all the solids of the composition,

30 to 50% by weight of at least one type of an alkylated amino formaldehyde resin.

7. Curable aminoplast acrylic polyol composition according to anyone of the claims 1 to

6, characterized in that the alkylated amino formaldehyde resin has a free formaldehyde content in accordance with DIN EN ISO 11402 4.3 of less than 0.05%.

8. Curable aminoplast acrylic polyol composition according to anyone of the claims 1 to

7, characterized in that the amino compound on which at least one type of the alkylated amino formaldehyde resin is based is melamine.

9. Curable aminoplast acrylic polyol composition according to anyone of the claims 1 to

8, characterized in that the alkyl groups of the alkylated amino formaldehyde resin are having 1 to 12 carbon atoms and are selected from the group consisting of methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, secondary butyl, tertiary butyl, amyl, hexyl, heptyl, octyl, nonyl, decyl, cyclopentyl, cyclohexyl, methyl cyclohexyl, trimethyl cyclohexyl, furfuryl, benzyl, methyl benzyl and diacetone-1-yl groups.

10. Curable aminoplast acrylic polyol composition according to claim 9, characterized in that the alkyl groups are methyl, n-butyl and isobutyl groups.

11. Process for preparing a curable aminoplast acrylic polyol composition according to anyone of the claims 1 to 10 by

(1 ) dissolving the components (a), (b) and (c) in the desired amounts in at least one organic solvent and

(2) homogenizing the resulting mixture to yield a liquid curable aminoplast acrylic polyol composition.

12. Process according to claim 1 1 , characterized in that the liquid curable aminoplast acrylic polyol composition is having a solids content of from 30 to 80% by weight, based on the complete weight of the composition.

13. Method of use of the curable aminoplast acrylic polyol composition in accordance with anyone of the claims 1 to 10 and of the liquid curable aminoplast acrylic polyol composition prepared in accordance with claim 11 or 12, characterized in that it is applied on a solid surface and cured at ambient temperatures down to winter ambient temperatures to yield a solid coating.

14. Method of use according to claim 13, characterized in that the solid surface is glass, metal, wood, textiles, plastics, concrete, concrete stones, asphalt concrete, brick, roof tile, masonry and tarmac.

15. Method of use according to claim 14, characterized in that the solid surface is concrete.