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Process for producing polyesters

A polyester and polycondensation technology, applied in the field of high molecular weight copolyester production, can solve the problems of color value improvement, complex melt operation, polyester decomposition reaction, etc., and achieve the effect of reducing discoloration

Inactive Publication Date: 2017-07-11
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is on the one hand very complex due to the multistage procedure and the desired polyester is not formed until remelting of the polyester in a suitable subsequent reaction at 260° C., and on the other hand the viscosity of the postcondensed starting material Already so high that complex melt manipulation is required
Furthermore, the high processing temperatures used in the postcondensation can lead to decomposition reactions of the polyester and thus to interruptions in the molecular weight build-up or to an increase in the acid number in the end product or to an increase in the color value

Method used

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  • Process for producing polyesters
  • Process for producing polyesters
  • Process for producing polyesters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] In a 10 L batch metal apparatus with funnel neck, distillation bridge and vacuum connection, 3604 g of dimethyl terephthalate (DMT) (18.58 mol), 1571 g of 1,2-propanediol (PD-1,2) (20.67mol), 943g of 1,3-propanediol (PD-1,3) (12.41mol) and 1323g of butylethyl-1,3-propanediol (BEPD) (8.27mol) with 3.50g of monobutyl stannoic acid ( MBTS) until the methanol begins to be eliminated (165-185°C). The reaction mixture was then heated further such that the overhead temperature was kept constant at 65-70°C. After methanol elimination was complete, 1285 g of isophthalic acid (IPA) (7.74 mol) and 678 g of adipic acid (AD) (4.64 mol) were added at an internal temperature of 180° C., and the mixture was further heated until at about 200 °C water begins to be eliminated. This continued until the top temperature dropped below 85°C again. Table 1 summarizes the properties of the transesterification and esterification products.

Embodiment 2

[0084] In a 10 L batch metal apparatus with funnel neck, distillation bridge and vacuum connection, 1812 g of dimethyl terephthalate (DMT) (9.34 mol), 203 g of monoethylene glycol (MEG) (3.28 mol), 1717 g of neopentyl glycol (NPG) (16.51 mol) and 357 g of cyclohexanedimethanol 90 (CHDM90) (2.23 mol) were heated with 0.90 g of zinc acetate until the methanol started to be eliminated (165-185°C). The reaction mixture was then heated further such that the overhead temperature was kept constant at 65-70°C. After the methanol elimination was complete, 1550 g of isophthalic acid (IPA) (9.34 mol) were added at an internal temperature of 180° C., and the mixture was further heated. Water elimination begins at about 210°C and this continues until the top temperature drops below 85°C again. Table 1 summarizes the properties of the transesterification and esterification products.

Embodiment 3

[0086] In a 10 L batch metal apparatus with funnel neck, distillation bridge and vacuum connection, 2986 g of isophthalic acid (IPA) (17.99 mol), 2264 g of 2,6-naphthalene dicarboxylic acid (10.48 mol), 16 g of trimellitic anhydride (TMA) (0.08mol), 676g of 1,4-butanediol (BD-1,4) (7.51mol), 698g of monoethylene glycol (MEG) (11.26mol), 1562g of neopentyl glycol ( NPG) (15.02 mol) and 601 g of cyclohexanedimethanol 90 (CHDM90) (3.76 mol) were heated with 2.80 g of octanediol titanate (OGT) until water began to be eliminated (185-195°C). Water elimination continued until the top temperature dropped below 85°C again. Table X summarizes the properties of the transesterification and esterification products.

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Abstract

The present invention provides processes for producing copolyesters, where, in a first step, di- and / or polycarboxylic acids are reacted with mono- or polyhydric alcohols, and / or lactones are reacted and, in a second step, a polycondensation is carried out, where the first step takes place in a reactor. When the first step is carried out in the reactor, the second step is carried out in a kneader to replace a stirring metal kettle, so that milder conditions and lower acid values can be achieved. The invention also relates to the use of a kneader in the processes for producing copolyesters to obtain lower acid values compared with those in use of a stirring metal kettle.

Description

[0001] The application for this invention is a divisional application of the PCT patent application PCT / EP2012 / 074930, the international filing date is December 10, 2012, and the invention title is "Method for Producing Polyester". For 201280062835.9. technical field [0002] The present invention relates to a process for producing high molecular weight copolyesters using a kneader. Background technique [0003] Copolyesters, also referred to herein simply as polyesters, have a wide variety of end uses. For example, they can be used as ingredients in adhesives, as binders for metal coatings such as the inner coating of cans, as binders for foil coatings and as ingredients in foil production. [0004] Industrially, polyesters are usually prepared by polycondensation of the corresponding di- or polycarboxylic acids with di- or polyols, i.e. by reaction of molecules with at least two reactive end groups, wherein small molecules are eliminated during the synthesis , such as wa...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/199C08G63/78C08G63/83C08G63/85
CPCC08G63/183C08G63/199C08G63/785C08G63/83C08G63/85C08G63/12C08G63/08C08G63/52
Inventor A.亨尼希T.施米德J.卢T.布兰德G.施密特M.科雷尔
Owner EVONIK DEGUSSA GMBH
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