Non-precipitating alkali/alkaline earth metal and aluminum compositions made with organic hydroxyacids
View Patent ↗A stable catalyst solution suitable for catalyzing the polycondensation of reactants to make polyester polymers comprising: (i) M, wherein M is represented by an alkaline earth metal or alkali metal and (ii) aluminum and (iii) ethylene glycol and (iii) organic hydroxyacid compounds having at least three carbon atoms and less than three carboxylic acid groups when the hydroxyacid compound has 8 or less carbon atoms, wherein the molar ratio of ethylene glycol:aluminum is at least 35:1. The hydroxyacid compounds enhance to solubility of M and Al in ethylene glycol, even at even at molar ratios of M:Al approaching 1:1. There is also provided a method for the manufacture of the composition, its feed to and use in the manufacture of a polyester polymer, and polyester polymers obtained by combining certain ingredients or containing the residues of these ingredients in the composition.
1. A composition obtained by combining:
i. M, wherein M is represented by an alkaline earth metal or alkali metal and
ii. aluminum and
iii. ethylene glycol and
iv. organic hydroxyacid compounds having at least three carbon atoms and less than three carboxylic acid groups when the hydroxyacid compound has 8 or less carbon atoms,
wherein the molar ratio of ethylene glycol:aluminum is at least 35:1,
the molar ratio M:Al ranges from 2.5:1 up to 10:1,
the molar ratio of M:hydroxyacid compounds is at least 0.80:1,
the composition contains 3000 ppm aluminum or more, and
the composition is capable of remaining as a solution over a period of at least two (2) weeks at ambient conditions.
2. The composition of claim 1 , wherein molar ratio of ethylene glycol:aluminum is at least 50:1.
3. The composition of claim 1 , wherein aluminum is obtained from an aluminum compound represented by the formula:
Al[OR] a [OR′] b [OR″] c [R′″] d
wherein R, R′, R″ are independently an alkyl group, aryl group, acyl group or hydrogen, R′″ is an anionic group, and a, b, c, d are independently 0 or positive integers, and a+b+c+d is not greater than 3.
4. The composition of claim 3 , wherein the aluminum compound comprises carboxylic acid salts of aluminum.
5. The composition of claim 4 , wherein the aluminum compound comprises carboxylic acid salts of aluminum or aluminum alcoholates.
6. The composition of claim 5 , wherein the carboxylic acid salt of aluminum comprises a diacetate monohydroxy compound or the monoacetate dihydroxy compound or a mixture thereof.
7. The composition of claim 1 , wherein the aluminum is obtained from aluminum acetate or aluminum isoproxide or both.
8. The composition of claim 1 , wherein the composition contains at least 5000 ppm aluminum based on the weight of the composition.
9. The composition of claim 8 , wherein the composition contains at least 1 wt. % aluminum based on the weight of the composition.
10. The composition of claim 9 , wherein the composition contains from 5000 ppm to 3 wt. % aluminum atoms.
11. The composition of claim 1 , wherein M comprises lithium, sodium, potassium, or combinations thereof.
12. The composition of claim 11 , wherein M comprises Li.
13. The composition of claim 11 , wherein M comprises Na.
14. The composition of claim 1 , wherein the composition comprises organic hydroxyacid compounds in an amount of 0.01 wt % to 5 wt. % based on the weight of the composition.
15. The composition of claim 1 , wherein the composition comprises organic hydroxyacid compounds in an amount ranging from 0.01 wt. % to 2 wt. %.
16. The composition of claim 1 , wherein the composition comprises organic hydroxyacid compounds in an amount ranging from 0.1 to 2 wt. %.
17. The composition of claim 1 , wherein the organic hydroxyacid compound has from 3 to 14 carbon atoms.
18. The composition of claim 1 , comprising organic hydroxyacid compounds having a hydroxyl group and a carboxylic acid group in the alpha position relative to each other.
19. The composition of claim 1 , comprising organic hydroxyacids having a hydroxy group and a carboxylic acid group in the beta position relative to each other.
20. The composition of claim 1 , wherein the organic hydroxyacid comprises lactic acid, tartaric acid, mandelic acid, salicylic acid, or mixtures thereof.
21. The composition of claim 1 , wherein the molar ratio of M:hydroxyacid compounds is at least 0.90:1.
22. The composition of claim 21 , wherein the molar ratio of M:hydroxyacid compounds is at least 1:1.
23. The composition of claim 22 , wherein the molar ratio of M:hydroxyacid compounds is at least 1.2:1.
24. The composition of claim 23 , wherein the molar ratio of M:hydroxyacid compounds is at least 1.5:1.
25. The composition of claim 1 , wherein the molar ratio of ethylene glycol:aluminum is at least 40:1.
26. The composition of claim 25 , wherein the molar ratio of M:hydroxyacid compounds is at least 0.95:1.
27. The composition of claim 1 , wherein the molar ratio of ethylene glycol:aluminum is at least 75:1.
28. The composition of claim 1 , wherein the molar ratio of ethylene glycol:aluminum is at least 100:1.
29. The composition of claim 28 , the molar ratio of M:hydroxyacid compounds is at least 1.5:1.
30. The composition of claim 29 , wherein the composition is a solution which is capable or remaining in solution for at least two (2) weeks when standing still at ambient conditions.
31. The Composition of claim 1 , wherein the molar ratio of ethylene glycol:aluminum is at least 125:1.