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Partially ester-exchanged SIPM and process therewith

A technology of transesterification and sodium ester, applied in the field of metal salt solution of dimethyl sulfoisophthalate, which can solve the problems of high transportation cost, inability to improve the color of the copolymer, and high cost

Inactive Publication Date: 2008-07-16
INVISTA TECHNOLOG IES S A R L
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of 20% Na-SIPEG solution is high as separate equipment is required to prepare the solution from Na-SIPM powder and diol
Shipping costs for 20% solutions are also high
[0011] It is also well known that phosphoric acid is generally used to control the discoloration of polyester homopolymers, but in some cases phosphoric acid also fails to improve the color of copolymers derived from terephthalic acid and sulfoisophthalic acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0023] According to another embodiment of the present invention, a process comprises: (a) contacting the partially transesterified SIPM with a polymerization mixture comprising a carbonyl compound and a second diol, optionally in the presence of a phosphorus compound and / or a catalyst , or (b) contacting the partially transesterified SIPM with an oligomer derived from a carbonyl compound and a second diol.

[0024] Catalysts and partially transesterified SIPMs may be the same as those disclosed above, and the disclosure of which is incorporated herein. The second diol may be the same or different from the diols disclosed above. A presently preferred second diol is ethylene glycol, 1,3-propanediol, or combinations thereof.

[0025] Any phosphorus compound may be used which, when used with a polyester catalyst, produces a polyester having a lower degree of yellowness than a polyester produced from a catalyst not employing such a phosphorus compound. Examples of suitable phosph...

Embodiment 1

[0043] This example illustrates the preparation of a partially transesterified Na-SIPM solution.

[0044] Ethylene glycol (EG; 800 g), sodium dimethyl 5-sulfoisophthalate (Na-SIPM; 400 g, available from DuPont) and anhydrous sodium acetate (NaAc; 8.0 g, available from Jarchem Industries Newark , NJ, USA) was added to a 1500 ml flask to prepare a slurry. The total weight of the mixture was 1208 g. The flask was covered with aluminum foil with small holes for methanol vapor flow. The slurry in the flask was stirred on a hot plate with a magnetic stirrer.

[0045] The stirred slurry was heated from 27°C to 141°C over 32 minutes. When the temperature reached 141 °C, the Na-SIPM powder was completely dissolved. Boiling starts at about 141°C. After 96 minutes, the temperature of the solution was gradually increased from 141°C to 159°C, averaging 148°C over this period. Due to the evaporation of methanol, the solution weight dropped from 1208 g to 1136 g. Then, 64 g of ethylen...

Embodiment 2

[0047] This example illustrates the polymerization of copolymers containing 2 mol % partially transesterified Na-SIPM solutions derived from DMT monomer in an autoclave.

[0048] Will contain 8.2g magnesium acetate tetrahydrate and 5.4g antimony oxide Sb 2 o 3 A solution of DMT in ethylene glycol (dimethyl terephthalate; obtained from DuPont; 18.1 kg), 12.5 kg ethylene glycol and 400 ml catalyst were charged in a stainless steel still. The top of the condensation tower is controlled at 85°C. Then, 6060 g of methanol and 2700 g of ethylene glycol were removed from the still. After 205 minutes in the still, the monomer temperature was raised to 240°C. The monomer then dripped into a stainless steel kettle. With 80ml phosphorus-containing solution (through 104ml85% H 3 PO 4 Prepared by mixing with 2000ml of ethylene glycol) was added to the kettle just after the monomer had dripped into the kettle. Then, 1660 g of the partially transesterified Na-SIPM solution prepared in ...

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Abstract

A process for producing a partially ester-exchanged SIPM such as an alkali metal bis(2-hydroxyethyl) 5-sulfoisophthalate produced from an alkali metal dimethyl 5-sulfoisophthalate in an alcohol is disclosed. The partially ester-exchanged SIPM in an alcohol can be used to copolymerize with oligomer of terephthalic acid or dimethyl terephthalate and an alcohol. Also disclosed is a process for controlling the color of a dyeable polyester using a phosphorous compound.

Description

field of invention [0001] The invention relates to a method for preparing a partially transesterified metal salt solution of dimethyl sulfoisophthalate in alcohol from a metal salt of dimethyl sulfoisophthalate, and a method for preparing a solution comprising Process for polymers of repeating units of isophthalic acid or its salts or esters, carbonyl compounds and alcohols. Background of the invention [0002] Polyester is widely used to make textile fibers and bottle resins, and can be prepared by combining an alcohol such as ethylene glycol with a carbonyl compound such as dimethyl terephthalate (DMT) or terephthalic acid (TPA). For example, DMT is reacted with an alcohol, such as ethylene glycol, in a transesterification column to form the diglycolate ("monomer") of terephthalate. The monomers are polymerized by condensation in one or two prepolymerizers followed by a final polymerizer or finisher. TPA can be combined with ethylene glycol to form a slurry at 60°C-80°C,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/688C08G63/78C08G63/83C08K5/49
CPCC08G63/6886C08K5/49C08G63/83
Inventor J·F·段X·马
Owner INVISTA TECHNOLOG IES S A R L
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