Fiber-forming polyester composition including a polyalkylene ether

Claim 2

A FIBER-FORMING POLYESTER HAVING IMPROVED DYEABILITY AND RESISTANCE TO PILLING CONSISTING ESSENTIALLY OF THE REACTION PROD DUCT OF AN ESTER PREPARED FROM AT LEAST ONE ACID COMPONENT CONSISTING ESSENTIALLY OF AN AROMATIC DICARBOXYLIC ACID OR LOWER ALKYL ESTER THEREOF AND AT LEAST ONE ALKYLENE GLYCOL HAVING 2 TO 10 CARBON ATOMS; WHEREIN BEFORE THE COMPLETION OF THE POLYMERIZATION REACTION IS ADDED A. NOT MORE THAN Y/Y -2 MOLE PERCENT AND NOT LESS THAN Y/15(Y - 2) MOLE PERCENT, BASED ON THE TOTAL ACID COMPONENT, OF A POLYALKYLENE OXIDE COMPOUND EXPRESSED BY THE GENERAL FORMULA

Claim 3

A polyester of claim 1, wherein the aromatic dicarboxylic acid is terephthalic acid, and the glycol is ethylene glycol.

Claim 4

In a process for producing improved polyesters, which comprises preparing a polyester from at least one acid component consisting essentially of an aromatic dicarboxylic acid or lower alkyl ester thereof and at least one alkylene glycol having 2 to 10 carbon atoms, the improvement wherein before the completion of the polymerization reaction, a. not more than Y/Y - 2 mole percent and not less than Y/15 (Y-2) mole percent, based on the total acid component, of a polyalkylene oxide compound expressed by the general formula R( O(CH-(CH2)n-O)xR'''') Y wherein R is a straight chain or cyclic aliphatic hydrocarbon having 4 to 25 carbon atoms, R'' is a hydrogen atom or a lower alkyl group, n is an integer of 1 to 3, x is an integer of 1 to 50, R'''' is a hydrogen atom or a hydrocarbon group with 1 to 10 carbon atoms having a carboxyl group or ester thereof, or a hydroxyl group or ester thereof, and Y is an integer of 3 to 6, and b. O to Y times the weight of Compound (a) of an ester -forming compound having at least 7 carbon atoms which has one -COOH, -OH, -COOR'''''' or -OOCR'''''' group, wherein R'''''' is a lower alkyl group; are added to the reaction system and thereafter the polymerization is completed.

Claim 5

In a process for producing improved polyesters, which comprises preparing a polyester from at least one acid component consisting essentially of an aromatic dicarboxylic acid or lower alkyl ester thereof and at least one alkylene glycol having 2 to 10 carbon atoms, the improvement wherein before the completion of the polymerization reaction, a. not more than Y/Y - 2 mole percent and not less than Y/15 (Y-2) mole percent, based on the total acid component, of a polyalkylene oxide compound expressed by the general formula R( O(CH-(CH2)n-O)xR'''') Y wherein R is a straight chain or cyclic aliphatic hydrocarbon having 4 to 25 carbon atoms, R'' is a hydrogen atom or a lower alkyl group, n is an integer of 1 to 3, x is an integer of 1 to 50, R'''' is a hydrogen atom or a hydrocarbon group with 1 to 10 carbon atoms having a carboxyl group or ester thereof, or a hydroxyl group or ester thereof, and Y is an integer of 3 to 6, and b. O to Y times the weight of Compound (a) of an ester -forming compound having at least 7 carbon atoms which has one -COOH, -OH, -COOR'''''' or -OOCR'''''' group, wherein R'''''' is a lower alkyl group; are added to the reaction system and thereafter the polymerization is completed.

Claim 6

A process of claim 3, wherein the aromatic dicarboxylic acid is terephthalic acid, and the glycol is ethylene glycol.

Claim 7

Polyester fibers having improved dyeability and resistance to pilling consisting essentially of the reaction product of an ester prepared from at least one acid component consisting essentially of an aromatic dicarboxylic acid or lower alkyl ester thereof and at least one alkylene glycol having 2 to 10 carbon atoms; wherein before the completion of the polymerization reaction is added a. not more than Y/Y - 2 mole percent and not less than Y/15 (Y - 2) mole percent, based on the total acid component, of a polyalkylene oxide compound expressed by the general formula

Claim 8

Polyester fibers having improved dyeability and resistance to pilling consisting essentially of the reaction product of an ester prepared from at least one acid component consisting essentially of an aromatic dicarboxylic acid or lower alkyl ester thereof and at least one alkylene glycol having 2 to 10 carbon atoms; wherein before the completion of the polymerization reaction is added a. not more than Y/Y - 2 mole percent and not less than Y/15 (Y - 2) mole percent, based on the total acid component, of a polyalkylene oxide compound expressed by the general formula

Claim 9

Polyester fibers of claim 5, aherein the aromatic dicarboxylic acid is terephthalic acid, and the glycol is ethylene glycol.

Claim 10

A process for producing polyester fibers having excellent resistance to pilling, which comprises melt spinning a fiber-forming polyester composition consisting essentially of the reaction product of an ester prepared from at least one acid component consisting essentially of an aromatic dicarboxylic acid or lower alkyl ester thereof and at least one alkylene glycol having 2 to 10 carbon atoms; wherein before the completion of the polymerization reaction is added a. not more than Y/Y - 2 mole percent and not less than Y/15 (Y - 2) mole percent, based on the total acid component, of a polyalkylene oxide compound expressed by the general formula

Claim 11

A process for producing polyester fibers having excellent resistance to pilling, which comprises melt spinning a fiber-forming polyester composition consisting essentially of the reaction product of an ester prepared from at least one acid component consisting essentially of an aromatic dicarboxylic acid or lower alkyl ester thereof and at least one alkylene glycol having 2 to 10 carbon atoms; wherein before the completion of the polymerization reaction is added a. not more than Y/Y - 2 mole percent and not less than Y/15 (Y - 2) mole percent, based on the total acid component, of a polyalkylene oxide compound expressed by the general formula