Polyester resin and process for its production
a polymer resin and polymer technology, applied in the field of polymer resin, can solve the problems of reduced aroma-retention property, high cost of germanium compound, and low UV shielding property
Inactive Publication Date: 2006-04-20
MITSUBISHI CHEM CORP
View PDF9 Cites 4 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
"The present invention provides a polyester resin with specific properties. The resin is made by polycondensing a mixture of terephthalic acid or its ester-forming derivative and ethylene glycol in the presence of a compound of titanium group elements, a compound of metal elements from groups 1A, 2A, manganese, iron, and cobalt, and a phosphorus compound. The resulting resin has a low content of copolymerized components other than the main components, and has specific optical properties when molded. The invention also provides a process for producing this polyester resin with the same properties."
Problems solved by technology
On the other hand, with a polyethylene terephthalate resin prepared by using a germanium compound as a polycondensation catalyst, which is commonly used for heat resistant bottles, copolymerizable components other than the terephthalic acid component and the ethylene glycol component, may be copolymerized in a relatively small amount at a level of more than 2 to 5 mol % based on the total dicarboxylic acid component, but the above-mentioned problem relating to a decrease of the aroma-retention property cannot still be solved, and the ultraviolet shielding property is also inferior, and further, the germanium compound is expensive, whereby an economical disadvantage cannot be avoided.
Further, many polyethylene terephthalate resins have been proposed which are prepared by using titanium compounds as polycondensation catalysts, but they have had problems such that they lack in thermal stability, so that the obtainable resins tend to have a yellowish color tone, or the change in the color tone after being heated is substantial, and further have problems such that acetaldehyde, a cyclic trimer, etc. are formed in a large amount as by-products during the polycondensation and the melt molding, and when used as bottles, they tend to deteriorate the tastes, aromas, etc. of the contained beverages.
However, according to the study conducted by the present inventors, it has been found that the polyethylene terephthalate resin obtainable by this process is not one which is able to solve the above-mentioned problem such as a decrease in the aroma-retention property and the problem such as deterioration of the taste, the aroma, etc. of the content.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
example 1
[0054] Slurries of 43 kg (260 mol) of terephthalic acid and 19 kg (312 mol) of ethylene glycol were continuously supplied over a period of 4 hours to an esterification reaction tank having about 60 kg of bis(hydroxyethyl) terephthalate previously charged and maintained at a temperature of 250° C. and a pressure of 1.2×105 Pa, and even after completion of the supply, the esterification reaction was further carried out for one hour. About one half of this esterification reaction product was transferred to a polycondensation tank.
[0055] Then, to the polycondensation tank to which the esterification reaction product was transferred, from its pipe, ethyl acid phosphate, magnesium acetate and tetra-n-butoxy titanium were sequentially added in their ethylene glycol solutions, respectively, with intervals of 5 minutes, so that 0.387 mol of phosphorus atoms (P), 0.062 mol of magnesium atoms (Mg) and 0.063 mol of titanium atoms (Ti) would remain per 1 ton of the resulting polyester resin. Th...
examples 2 to 6
[0077] The operation was carried out in the same manner as in Example 1 except that the amounts of ethyl acid phosphate, magnesium acetate and tetra-n-butoxy titanium at the time of the melt polycondensation were changed as shown in Table 1, and then results are shown in Table 1.
example 7
[0078] The operation was carried out in the same manner as in Example 2 except that the solid phase polycondensation polyester resin obtained in Example 2 was further subjected to water treatment by immersing it in hot water of 90° C. for two hours, and the results are shown in Table 1.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| Tc | aaaaa | aaaaa |
| Tc | aaaaa | aaaaa |
| thickness | aaaaa | aaaaa |
Login to View More
Abstract
A polyester resin, whereby a molded product excellent in a gas barrier property and also excellent in an ultraviolet shielding property, a color tone, etc., and which is particularly suitable for molding a bottle for e.g. a beverage required to have an aroma retention property, and further, a polyester resin, whereby the acetaldehyde content as a molded product is reduced to eliminate an influence over the taste, aroma, etc. of the content, and a process for its production, wherein the polycondensability is improved, are to be presented. A polyester resin produced by polycondensing a dicarboxylic acid component containing terephthalic acid or its ester-forming derivative as the main component, and a diol component containing ethylene glycol as the main component in the presence of (1) a compound of at least one member selected from the group consisting of titanium group elements in Group 4A of the periodic table, via an esterification reaction or an ester exchange reaction, characterized in that the content of copolymerized components other than the terephthalic acid component and the ethylene glycol component, is not more than 4 mol % based on the total dicarboxylic acid component, and in a molded product with a thickness of 3.5 mm injection-molded at 280° C., the difference between the absorbance at a wavelength of 395 nm and the absorbance at a wavelength of 800 nm is at least 0.08, and the difference between the absorbance at a wavelength of 500 nm and the absorbance at a wavelength of 800 nm is at most 0.05; and a process for producing a polyester resin, which comprises polycondensing a dicarboxylic acid component containing terephthalic acid or its ester-forming derivative as the main component, and a diol component containing ethylene glycol as the main component in the presence of (1) a compound of at least one member selected from the group consisting of titanium group elements in Group 4A of the periodic table, (2) a compound of at least one element selected from the group consisting of metal elements of Group Ia of the periodic table, elements of Group IIa of the periodic table, manganese, iron and cobalt, and (3) a phosphorus compound, via an esterification reaction or an ester exchange reaction, characterized in that the amounts of the respective compounds (1), (2) and (3) are such amounts that their contents will be from 0.02 to 0.2 mol as the total amount (T) of atoms of the compound (1), from 0.04 to: 0.6 mol as the total amount (M) of atoms of the compound (2) and from 0.02 to 0.4 mol as the total amount (P) of atoms of the compound (3), per 1 ton of the polyester resin.
Description
TECHNICAL FIELD [0001] The present application claims a benefit of Japanese Patent Application No. 2001-29135, and the content of this application will be referred to as a reference in the present specification. [0002] The present invention relates to a polyester resin, whereby a molded product excellent in a gas barrier property and also excellent in an ultraviolet shielding property, a color tone, etc., and which is particularly suitable for molding a bottle for e.g. a beverage required to have an aroma retention property, and further, to a polyester resin, whereby the acetaldehyde content in a molded product is reduced to eliminate an influence over the taste, aroma, etc. of the content, and a process for its production, whereby the polycondensability is improved. BACKGROUND ART [0003] Heretofore, a polyester resin such as a polyethylene terephthalate resin has been widely used for packaging containers for various beverages, etc., since it is excellent in mechanical strength, che...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & AuthorityApplications(United States)
IPC IPC(8): C08G63/02C08G63/183C08G63/82C08G63/83C08G63/85C08G63/87
CPCC08G63/183C08G63/82C08G63/826C08G63/83C08G63/85C08G63/87
InventorFUJIMORI, YOSHIHIRONUKUI, MASAHIROYATSUGI, YUTAKAMATSUI, KENICHI
OwnerMITSUBISHI CHEM CORP