Soluble mono-alkyl stannoic acid catalyst and its use in preparing high molecular weight polyesters
First Claim
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1. A soluble mono-alkyl Stannoic Acid catalyst which is formed by heating a mono-alkyl Stannoic Acid with a glycol of the formula (I):
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space="preserve" listing-type="equation">HO--R--OH (I)wherein R is selected from C2 to C50 alkyl, cycloalkyl, aryl and combinations thereof at a temperature of at least 180°
C. whereby the mono-alkyl Stannoic Acid is selectively reacted with the glycol to yield a mono-alkyl Stannoic Acid/glycol liquid phase.
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Abstract
A soluble mono-alkyl Stannoic Acid/glycol liquid phase catalyst produced from the reaction of a mono-alkyl Stannoic Acid and a glycol at a temperature of from at least 180° C., and its use in preparing high molecular weight polyester polymers.
20 Citations
12 Claims
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1. A soluble mono-alkyl Stannoic Acid catalyst which is formed by heating a mono-alkyl Stannoic Acid with a glycol of the formula (I):
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space="preserve" listing-type="equation">HO--R--OH (I)wherein R is selected from C2 to C50 alkyl, cycloalkyl, aryl and combinations thereof at a temperature of at least 180°
C. whereby the mono-alkyl Stannoic Acid is selectively reacted with the glycol to yield a mono-alkyl Stannoic Acid/glycol liquid phase. - View Dependent Claims (2)
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3. In a process for preparing a high molecular weight polyester polymer from a low molecular weight reaction product obtained from (trans)esterifying one or more mono-, di- or tricarboxylic acids and one or more alkyl(aryl) glycols in the presence of a (trans)esterification catalyst, the improvement comprising (trans)esterifying said one or more mono-, di- or tricarboxylic acids and said one or more alkyl(aryl) glycols in the presence of a mono-alkyl Stannoic Acid/glycol liquid phase catalyst which is produced by reacting a mono-alkyl Stannoic Acid with an alkyl(aryl) glycol at a temperature in the range of at least 180°
- C. at a glycol;
tin ratio in the range of from 3;
1 to 1000;
1 by weight. - View Dependent Claims (4, 5, 6, 7)
- C. at a glycol;
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8. A method for preparing a mono-alkyl Stannoic Acid/glycol soluble catalyst which comprises:
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(a) heating a mono-alkyl Stannoic Acid selected from mono-butyl Stannoic Acid and mono-octyl Stannoic Acid in the presence of a glycol to a temperature of at least 180°
C. until the starting tin compound is selectively reacted with the glycol;(b) allowing the reaction mixture to cool to yield a mono-alkyl Stannoic Acid/glycol liquid phase and a solid precipitate; and
optionally(c) removing the solid precipitate from the mono-alkyl Stannoic Acid/glycol liquid phase. - View Dependent Claims (9)
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10. A process for preparing a high molecular weight polyester polymer selected from poly(ethylene terephthalate), poly(1,3-propylene terephthalate) and poly(1,4-butylene terephthalate) which comprises:
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(a) (trans)esterifying a dicarboxylic acid selected from terephthalic acid and isothalaic acid with a glycol selected from 1,2-ethanediol, 1,3-propanediol and 1,4-butanediol in the presence of a (trans)esterification catalyst which is a mono-alkyl Stannoic Acid/glycol liquid phase catalyst which is produced by reacting a mono-alkyl Stannoic Acid with a glycol selected from 1,2-ethanediol, 1,3-propanediol and 1,4-butanediol at a temperature in the range of from 200°
C. to 210°
C. at a tin;
glycol ratio in the range of from 3;
1 to 1000;
1 by weight to produce a low molecular weight pre-polymer, and(b) polymerizing the pre-polymer to high molecular weight in a meltpolycondensation reaction or by solid state polymerization. - View Dependent Claims (11, 12)
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Specification