Compositions for coatings that do not contain heavy metals

 

The invention relates to UV-curable cation-curable compositions that do not contain heavy metals. UV cation-curable composition contains (a) mono-, bis - or higher aliphatic or aromatic glycidyloxy esters, (b) titanium dioxide, (C) as photoinitiator at least one hexaphosphate salt iodine formula Iwhere R1, R2, R3and R4each independently of one another represents hydrogen, C1-C20alkyl or unsubstituted or hydroxylamine1-C20alkoxy, provided that at least one of R1, R2, R3or R4is not a hydrogen atom, and (d) connection of components, the content of the component (a) is 40-70%, the content of titanium dioxide (b) is 20-55%, the content of photoinitiator (C) is 0.5-10% and the content of the connection-sensitizer (d) is 0.1-3%. The invention relates to a substrate with the coating, the method of photopolymerization composition under item 1. The invention allows to obtain a composition having good resistance to yellowing and does not contain heavy metals. 3 S. and 7 C.p. f-crystals, 1 table.

1. UV cation-curable composition comprising (a) mono-, bis - or higher aliphatic or aromatic glycidyloxy esters, (b) titanium dioxide, (C) as photoinitiator at least one hexaphosphate salt iodine formula I

where R1, R2, R3and R4each independently of one another represents hydrogen, C1-C20alkyl or unsubstituted or hydroxylamine1-C20alkoxy, provided that at least one of R1, R2, R3or R4is not a hydrogen atom;

(d) connection of components, the content of the component (a) is 40-70%, the content of titanium dioxide (b) is 20-55%, the content of photoinitiator (C) is 0.5-10% and the content of the connection-sensitizer (d) is 0.1-3%.

2. The composition according to p. 1, characterized in that the compound of the formula I R2is1-C12alkyl, in particular, isobutyl or dodecyl, and R1, R3and R4are hydrogen atoms.

3. The composition according to p. 1, characterized in that the connection-sensitizer (d) is a compound selected from the group consisting of anthracene, KSA is(d) is a derivative of thioxanthone.

5. The composition according to p. 1, characterized in that glycidyloxy ether (a) is a compound of formula II

where x is a number from 1 to 6;

R5represents a monovalent or hexavalent alkyl or aryl radical.

6. The substrate with the coating at least one surface of which is covered with composition under item 1.

7. The substrate under item 6, characterized in that the specified composition under item 1 is applied at a coating thickness of 0.1 to 100 microns.

8. The way the photopolymerization composition under item 1, providing for the exposure of specified composition of light with a wavelength of 200-600 nm.

9. The method according to p. 8, characterized in that after irradiation are heat treated.

10. The method according to p. 8, characterized in that it is used for coatings, paints, printing inks, powder coatings, laminating adhesives or compositions for toothpaste, in particular white enamel compositions.

 

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