Catalytic composition of organotin compounds
View Patent ↗The present invention relates to catalytic compositions for esterification, transestrification and polycondensation reactions, a process for the catalysis of said reactions employing such catalytic compositions and polyesters for resins obtainable by this process.
1. A catalytic composition for esterification, transesterification and polycondensation reactions of dicarboxylic acids, polycarboxylic acids and/or hydroxy carboxylic acids and alcohols, said catalytic composition containing a tin compound of the general formula (I):
[(R 1 Sn) l (OH) m-n (OR 2 ) n O o ] p+ A q− p/q (formula I)
wherein:
R 1 and R 2 each independently is a linear, branched or cyclic alkyl group or aryl group having 1 to 12 carbon atoms,
A q− is an anion,
l=12,
m=6,
n=1 to 6,
o=14,
p=2 and
q=1 to 2.
2. The catalytic composition according to claim 1 , wherein the anion A q− is O 2− , OH − , a linear, branched or cyclic alkyl carboxy group, aryl carboxy group or alkoxy group each having 1 to 12 carbon atoms, the anion of a mineral acid or a metalate.
3. The catalytic composition according to claim 2 , wherein the anion A q− is a sulphate, sulphite, phosphate, halogenide or pseudo-halogenide, titanate, zirconate, aluminate or zincate anion.
4. The catalytic composition according to claim 1 , wherein the anion A q− is a chloride anion and R 1 is an octyl- and/or butyl group.
5. A process for the preparation of a catalytic composition according to claim 1 , said process comprising the step of reacting a metal alkoxide with a tin compound of the general formula:
[(R 1 Sn) l (OH) m O o ] P+ A q− p/q·
6. The process according to claim 5 , wherein said metal alkoxide and said tin compound are reacted in a mole proportion of 1:0.0001 up to 1:20, in particular 1:4 to 1:6, respectively.
7. The process according to claim 6 , wherein resultant metal oxides, metal hydroxides and/or alkoxy metal hydroxides remain in the catalytic composition.
8. The process according to claim 5 , wherein resultant metal oxides, metal hydroxides and/or alkoxy metal hydroxides remain in the catalytic composition.
9. A method for the continuous or batchwise production of esters or polycondensation products by esterification, transesterification, polyesterification or polytransesterification reaction, said method comprising using the catalytic composition as defined in claim 1 .
10. The method according to claim 9 , comprising a polyesterification reaction of a dicarboxylic acid derivative with a mono, divalent or polyvalent alcohol in the presence of the catalytic composition.
11. The method according to claim 10 , employing derivatives of di or polycarboxylic acids selected from the group of esters or halogenides.
12. The method according to claim 9 , employing derivatives of di or polycarboxylic acids selected from the group of esters or halogenides.
13. The method according to claim 9 , employing derivatives of hydroxycarboxylic acids selected from esters.
14. The method according to claim 9 , employing a metal concentration of said catalytic composition in the range of 0.1 ppm to 1 mole percent, in particular 10-100 ppm with reference to the acid or derivative to be reacted.
15. The method according to claim 9 , employing a solvent or suspending agent for the manufacturing of the catalytic composition and/or said esterification, transesterification, polyesterification or polytransesterification reaction.
16. The method according to claim 15 , employing the same solvent and/or suspending agent in the manufacturing of said catalytic composition and said esterification, transesterification, polyesterification or polytransesterification reaction.
17. The method according to claim 15 , employing a solvent or suspending agent selected from the group consisting of mono-, di- or polyvalent alcohols being reacted in said esterification, transesterification, polyesterification or polytransesterification reaction.