Patent ID: 7087299
Filing Date: 2006-08-08
Classification: C08G,D01F,Y10T

Abstract:
1. Polyester fibers comprising, as a principal component, a polyester polymer and having an individual fiber thickness of 0.1 to 1.0 dtex, wherein the polyester polymer is one produced by polycondensing an aromatic dicarboxylate ester in the presence of a catalyst, the catalyst comprises at least one member selected from the mixtures (1) and reaction products (2) as specified below, the mixture (1) for the catalyst comprises (A) a titanium compound component comprising at least one member selected from the group consisting of: (a) titanium alkoxides represented by the general formula (I): in which formula (I), R 1 , R 2 , R 3 and R 4 respectively and independently from each other represent a member selected from alkyl groups having 1 to 20 carbon atoms and a phenyl group, m represents an integer of 1 to 4, and when m represents an integer of 2, 3 or 4, the 2, 3 or 4 R 2 s and R 3 s may be respectively the same as each other or different from each other, and (b) reaction products of the titanium alkoxides of the general formula (I) with aromatic polycarboxylic acids represented by the formula (II): in which formula (II), n represents an integer of 2 to 4, or anhydrides of the acids of the formula (II), and mixed with (B) a phosphorus compound component comprising at least one phosphorus compound represented by the general formula (III): in which formula (III), R 5 , R 6 and R 7 respectively and independently from each other represent an alkyl group having 1 to 4 carbon atoms, X represents a member selected from a —CH 2 — group and a —CH(Y)— group (wherein Y represents a phenyl group), the mixture (1) for the catalyst for the polycondensation being employed in an amount satisfying the requirements represented by the following expressions of relation (i) and (ii): and wherein M Ti represents a ratio in % of a value in milli mole of titanium element contained in the titanium compound component (A) to a value in mole of the aromatic dicarboxylate ester, and M P represents a ratio in % of a value in milli mole of phosphorus element contained in the phosphorus compound component (A) to the value in mole of the aromatic dicarboxylate ester; and the reaction products (2) for the catalyst comprises (C) a titanium compound component comprising at least one member selected from the groups consisting of: (c) titanium alkoxides represented by the general formula (I) and (d) reaction products of the titanium alkoxides of the general formula (I) with aromatic polycarboxylic acids represented by the above-mentioned general formula (II) or anhydride of the acids; and reacted with (D) a phosphorus compound component comprising at least one phorous compound represented by the general formula (IV): in which formula (IV), R 8 represents an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 20 carbon atoms, and p represents an integer of 1 or 2.