Catalyst for polyester production, process for producing polyester using the catalyst, polyester obtained by the process, and uses of the polyester
First Claim
1. A catalyst useful for polyester production, comprising:
- (I) a polycondensation catalyst component comprising a solid titanium compound (I-c) obtained by dehydro-drying hydrolyzed titanium halide, and (II) a co-catalyst component comprising a magnesium compound.
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Abstract
The present invention provides a catalyst for polyester production capable of producing a polyester with high catalytic activity and a process for producing a polyester using the catalyst. The catalyst for polyester production comprises a solid titanium compound which is obtained by dehydro-drying a hydrolyzate obtained by hydrolysis of a titanium halide and which has a molar ratio (OH/Ti) of a hydroxyl group (OH) to titanium (Ti) exceeding 0.09 and less than 4. The present invention also provides a method to obtain a polyester having a small increase of the acetaldehyde content during the molding. This method comprises bringing a polyester, which is obtained by the use of a titanium compound catalyst and in which the reaction has been completed, into contact with a phosphoric ester aqueous solution or the like having a concentration of not less than 10 ppm in terms of phosphorus atom. The present invention further provides a polyester having excellent transparency and tint and molded products of the polyester such as a blow molded article, a film, a sheet and a fiber. The polyester is obtained by polycondensing an aromatic dicarboxylic acid or an ester-forming derivative thereof and an aliphatic diol or an ester-forming derivative thereof in the presence of a catalyst for polyester production which comprises a polycondensation catalyst component comprising a solid titanium compound and a co-catalyst component comprising a magnesium compound. This polyester has a titanium content of 1 to 100 ppm, a magnesium content of 1 to 200 ppm and a weight ratio (Mg/Ti) of magnesium to titanium of not less than 0.01.
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Citations
20 Claims
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1. A catalyst useful for polyester production, comprising:
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(I) a polycondensation catalyst component comprising a solid titanium compound (I-c) obtained by dehydro-drying hydrolyzed titanium halide, and (II) a co-catalyst component comprising a magnesium compound. - View Dependent Claims (3, 15, 17)
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2. A catalyst useful for polyester production, comprising:
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(I) a polycondensation catalyst component comprising a solid titanium compound (I-d) obtained by dehydro-drying hydrolyzed mixture of (i) titanium halide and (ii) a compound of at least one element other than titanium or a precursor of said compound, and (II) a co-catalyst component comprising a magnesium compound. - View Dependent Claims (16)
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4. A catalyst useful for polyester production, comprising:
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(I) a polycondensation catalyst component comprising a solid titanium compound (I-e) obtained by bringing a titanium halide into contact with water to hydrolyze the titanium halide and thereby obtain an acid solution containing a hydrolyzate of the titanium halide, rendering the solution basic by addition of base, then adjusting pH of the solution to 2 to 6 by addition of acid, and dehydro-drying the resulting precipitate; and
(II) a cocatalyst component comprising a magnesium compound.
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5. A catalyst useful for polyester production, comprising:
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(I) a polycondensation catalyst component comprising a solid titanium compound (I-f) obtained by bringing a titanium halide into contact with water to hydrolyze the titanium halide and thereby obtaining an acid solution containing a hydrolyzate of the titanium halide, and adding a base to the solution to adjust the pH to from 2 to 6, and dehydro-drying the resulting basic solution of hydrolyzed titanium halide, and (II) a cocatalyst component comprising a magnesium compound.
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6. A catalyst useful for polyester production, comprising:
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(I) a polycondensation catalyst component comprising a solid titanium compound (I-g) obtained by bringing a mixture of (i) titanium halide and (ii) a compound of an element other than titanium or a precursor of said compound, into contact with water to hydrolyze the titanium halide and thereby obtain an acid solution containing a hydrolyzate of the titanium halide, rendering the solution basic addition of base, then adjusting pH of the solution to 2 to 6 by the addition of acid, and dehydro-drying the resulting precipitate; and
(II) a cocatalyst component comprising a magnesium compound. - View Dependent Claims (7)
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8. A catalyst useful for polyester production, comprising
a polycondensation catalyst component comprising a solid titanium compound (I-h) obtained by bringing a mixture of (i) titanium halide and (ii) a compound of an element other than titanium or a precursor of said compound, into contact with water to hydrolyze the titanium halide and thereby obtain an acid solution containing a hydrolyzate of the titanium halide, rendering the solution basic by addition of base, then adjusting pH of the solution to 2 to 6 by the addition of acid, and dehydro-drying the resulting precipitate; - and
(II) a cocatalyst component comprising a magnesium compound. - View Dependent Claims (9)
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10. A polyester (P-5) which is obtained by polycondensing an aromatic dicarboxylic acid or an ester-forming derivative thereof and an aliphatic diol or an ester-forming derivative thereof, in the presence of:
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(I) a polycondensation catalyst component comprising a solid titanium compound (I-c) obtained by dehydro-drying hydrolyzed titanium halide, and (II) a co-catalyst component comprising a magnesium compound, said polyester being characterized by satisfying the following relationship;
- View Dependent Claims (11, 12, 13, 14, 18, 19, 20)
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Specification