polycarbonate diol

A polycarbonate diol and repeating unit technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as strong interaction, poor dispersion stability, and high viscosity

Active Publication Date: 2018-10-16
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when polycarbonate diols are used in coating compositions, high viscosity and large amounts of solvents are required
Furthermore, the polycarbonate diol has a strong intermolecular interaction, so there is a problem that the dispersion stability of additives such as pigments is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0145] Put 275g (3.1mol) of dimethyl carbonate, 500g (4.8mol) of 1,5-pentanediol, 490g (4.2mol) of ) 1,6-hexanediol. 0.2 g of tetrabutyl titanate was added as a catalyst to the aforementioned flask, and the mixture in the aforementioned flask was stirred and heated under normal pressure. The reaction temperature was set at 190° C., and the reaction was carried out for 12 hours while distilling off a mixture of methanol and dimethyl carbonate generated. Thereafter, the pressure in the flask was reduced to 12 kPa, and the reaction was further performed at 195° C. for 5 hours while distilling off diol and dimethyl carbonate. Thereafter, 0.22 g of 2-ethylhexyl acid phosphate was added as a phosphorus compound to the flask, and the mixture in the flask was heated at 120° C. for 5 hours to obtain polycarbonate diol. Table 1 shows the analysis results of the obtained polycarbonate diol. This polycarbonate diol is abbreviated as PC-1. The obtained polycarbonate diol has a repeatin...

Embodiment 2

[0147] 310g (3.4mol) of dimethyl carbonate, 500g (4.8mol) of 1,5-pentanediol, 490g (4.2mol) of ) 1,6-hexanediol. 0.2 g of tetrabutyl titanate was added as a catalyst to the aforementioned flask, and the mixture in the aforementioned flask was stirred and heated under normal pressure. After distilling off the mixture of produced methanol and dimethyl carbonate, the reaction temperature was set at 160° C. to react for 2 hours, and then the reaction temperature was increased to 190° C. to further react for 12 hours. Thereafter, the pressure in the flask was reduced to 12 kPa, and the reaction was further performed at 195° C. for 5 hours while distilling off diol and dimethyl carbonate. Thereafter, 0.22 g of 2-ethylhexyl acid phosphate was added as a phosphorus compound to the flask, and the mixture in the flask was heated at 120° C. for 5 hours to obtain polycarbonate diol. Table 1 shows the analysis results of the obtained polycarbonate diol. This polycarbonate diol is abbrev...

Embodiment 3

[0149] In a 2L glass flask equipped with a rectification column filled with a regular packing and a stirring device, put 350g (3.9mol) of dimethyl carbonate, 500g (4.8mol) of 1,5-pentanediol, 490g (4.2mol) ) 1,6-hexanediol. 0.2 g of tetrabutyl titanate was added as a catalyst to the aforementioned flask, and the mixture in the aforementioned flask was stirred and heated under normal pressure. After distilling off the mixture of produced methanol and dimethyl carbonate, the reaction temperature was set at 150° C. to react for 3 hours, and then the reaction temperature was increased to 190° C. to further react for 12 hours. Thereafter, the pressure in the flask was reduced to 12 kPa, and the reaction was further performed at 195° C. for 5 hours while distilling off diol and dimethyl carbonate. Thereafter, 0.22 g of 2-ethylhexyl acid phosphate was added as a phosphorus compound to the flask, and the mixture in the flask was heated at 120° C. for 5 hours to obtain polycarbonate d...

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PUM

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Abstract

This polycarbonate diol comprises repeating units represented by formula (A) and terminal hydroxyl groups. If the integrated value of signals at 3.90 to 4.45 ppm is 1,000 in H1-NMR measured using deuterated chloroform as the solvent and tetramethylsilane as the standard substance, the integrated value at 3.33 to 3.43 ppm is 0.1 to 10.0. (In formula (A), R is a C3-15 divalent aliphatic or alicyclic hydrocarbon, and one or more types can be selected for all repeating units.)

Description

technical field [0001] This invention relates to polycarbonate diols. Background technique [0002] Polycarbonate diols are known as soft segments such as polyurethanes and thermoplastic elastomers as raw materials excellent in hydrolysis resistance, light resistance, oxidative degradation resistance, heat resistance, and the like. However, when polycarbonate diol is used in a coating composition, a high viscosity and a large amount of solvent are required. Furthermore, since polycarbonate diol has strong intermolecular interactions, there is a problem that the dispersion stability of additives such as pigments is poor. [0003] In order to solve such disadvantages, various liquid polycarbonate diols have been disclosed. For example, polycarbonate diols for paints having excellent compatibility, low viscosity, and solubility in poor solvents are disclosed (for example, refer to Patent Document 1). In addition, a low-viscosity polycarbonate / polyether block copolymer is dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/02C08G18/10C08G18/44C09D175/04
CPCC08G18/10C08G18/44C08G64/02C09D175/04
Inventor 上野英三郎
Owner ASAHI KASEI KK
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