摘要:
A polyester resin produced by polycondensing a dicarboxylic acid component containing an aromatic dicarboxylic 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 at least an antimony compound and a phosphorus compound, via an esterification reaction or an ester exchange reaction, which is characterized in that the amount of antimony eluted when immersed in hot water of 95° C. for 60 minutes in the form of particles having a number average particle weight of 24 mg, is not more than 1 μg per 1 g of the polyester resin, as antimony atoms (Sb).
摘要:
A polyester resin produced by polycondensing a dicarboxylic acid component containing an aromatic dicarboxylic 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 at least an antimony compound and a phosphorus compound, via an esterification reaction or an ester exchange reaction, which is characterized in that the amount of antimony eluted when immersed in hot water of 95° C. for 60 minutes in the form of particles having a number average particle weight of 24 mg, is not more than 1 &mgr;g per 1 g of the polyester resin, as antimony atoms (Sb).
摘要:
A polyester resin is prepared 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, wherein the content of copolymerized components other than the terephthalic acid component and the ethylene glycol component, is not more than 4 mole % 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.
摘要:
A polyester resin characterized in that the content of the 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 when polyester resin is formed into a molded product, the molded product has a specific absorbance.
摘要:
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.
摘要:
A polyester resin characterized in that the content of the copolymerized components other than the terephthalic acid component and the ethylene glycol component, is not more than 4 mol % based on the total discarboxylic acid component, and when polyester resin is formed into a molded product, the molded product has a specific absorbance.
摘要:
A process for producing a polyester using a catalyst, which catalyst enables producing a polyester excellent in color tone and transparency at a high reaction velocity; the catalyst; and a method for producing the catalyst, which catalyst comprises: (1) at least one metal element selected from the group consisting of metal elements of Group 4A of the Periodic Table, (2) at least one metal element selected from the group consisting of metal elements of Group 2A of the Periodic Table, aluminum, manganese, iron, cobalt, zinc, gallium and germanium, (a) when the total amount of metal atoms derived from metal element (1) is represented by t (mol/catalyst kg), and the total amount of metal atoms derived from metal element (2) is represented by m (mol/catalyst kg), the value of m/t is within 0.50≦m/t≦3.50.
摘要:
Polymerization catalysts for polyesters include: (1) metal elements selected from metal elements of Group 4A of the Periodic Table; and (2) metal elements selected from metal elements of Group 2A of the Periodic Table, aluminum, manganese, iron, cobalt, zinc, gallium and germanium. The catalysts are in a liquid state with a turbidity of at most 20% in a light path length of 10 mm, and a ratio the total amount of metal atoms derived from the above metal element (2) to the total amount of metal atoms derived from the above metal element (1) is from 0.50 to 3.50.
摘要:
A polymerization catalyst for a polyester, characterized in that it comprises components having at least the following metal element (1) and the following metal element (2), their contents satisfy the following (a), it is in a liquid state with a turbidity of at most 20% in a light path length of 10 mm, and a polyester excellent in color tone and transparency can be produced at a high reaction velocity with it, a method for producing it and a process for producing a polyester using it: (1) at least one metal element selected from the group consisting of metal elements of Group 4A of the Periodic Table, (2) at least one metal element selected from the group consisting of metal elements of Group 2A of the Periodic Table, aluminum, manganese, iron, cobalt, zinc, gallium and germanium, (a) when the total amount of metal atoms derived from the above metal element (1) is represented by t (mol/catalyst kg), and the total amount of metal atoms derived from the above metal element (2) is represented by m (mol/catalyst kg), the value of m/t is within the following range: 0.50≦m/t≦3.50
摘要:
A polymerization catalyst for a polyester, characterized in that it comprises components having at least the following metal element (1) and the following metal element (2), their contents satisfy the following (a), it is in a liquid state with a turbidity of at most 20% in a light path length of 10 mm, and a polyester excellent in color tone and transparency can be produced at a high reaction velocity with it, a method for producing it and a process for producing a polyester using it: (1) at least one metal element selected from the group consisting of metal elements of Group 4A of the Periodic Table, (2) at least one metal element selected from the group consisting of metal elements of Group 2A of the Periodic Table, aluminum, manganese, iron, cobalt, zinc, gallium and germanium, (a) when the total amount of metal atoms derived from the above metal element (1) is represented by t (mol/catalyst kg), and the total amount of metal atoms derived from the above metal element (2) is represented by m (mol/catalyst kg), the value of m/t is within the following range: 0.50≦m/t≦3.50