Reduction of carboxyl end groups in polyester fibers with lactim ethers
US4839124A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 29, 1988 |
| Grant date | Jun 13, 1989 |
| Priority date | — |
| Expiry date | Feb 29, 2008 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F6/62
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
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 ##STR1## wherein n is an integer of 2 to 15; PA1 m is an integer of 1 to 4; PA1 R.sub.1 and R.sub.2 are independently hydrogen, halogen, nitro, amine, C.sub.1 -C.sub.10 alkyl, C.sub.5 -C.sub.12 cycloalkyl, C.sub.7 -C.sub.9 alkyl aromatic, or C.sub.6 -C.sub.10 aromatic; and PA1 R.sub.3 is a mono- to tetravalent organic radical selected from the group consisting of C.sub.1 -C.sub.32 alkyl, C.sub.5 -C.sub.14 cycloalkyl, C.sub.7 -C.sub.16 alkyl aromatic, and C.sub.6 -C.sub.14 aromatic. The lactim reacted polymer is then melt spun to form a fiber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.