Reduction of carboxyl end groups in polyester with lactim...

Details Reduction of carboxyl end groups in polyester with lactim... Reduction of carboxyl end groups in polyester with lactim...

D - Textiles, Paper

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D

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D01D 5/28 (2006.01) C08G 63/20 (2006.01) C08G 63/685 (2006.01) D01D 5/08 (2006.01) D01F 1/10 (2006.01) D01F 6/62 (2006.01) D01F 8/12 (2006.01) D01F 8/14 (2006.01)

Patent

CA 1320028

REDUCTION OF CARBOXYL END GROUPS IN POLYESTER WITH LACTIM ETHERS ABSTRACT OF THE INVENTION An improved process for controlling and reducing the concentration of free carboxyl end groups in condensation polyester melt spun fiber is provided. By selection of a multifunctional compound, it is possible to increase the intrinsic viscosity of the fiber. The process comprises admixing and reacting with molten polyester polymer an effective amount of a lactim compound of the formula Image wherein n is an integer of 2 to 15; m is an integer of 1 to 4; R1 and R2 are independently hydrogen, halogen, nitro, amine, C1-C10 alkyl, C5-C12 cycloalkyl, C7-C9 alkyl aromatic, or C6-C10 aromatic; and R3 is a mono- to tetravalent organic radical selected from the group consisting of C1-C32 alkyl, C5-C14 cycloalkyl, C7-C16 alkyl aromatic, and C6-C14 aromatic. The lactim reacted polymer is then melt spun to form a fiber.

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