Preparation of polyether ester amides
US4349661A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 25, 1980 |
| Grant date | Sep 14, 1982 |
| Priority date | — |
| Expiry date | Aug 25, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G69/44
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The process for preparing thermoplastic polyether amides or polyether ester amides from lactams, dicarboxylic acids and polyethers having hydroxyl end groups and amino end groups or polyethers having amine end groups is improved. First, a mixture of lactams having at least 8 C atoms with dicarboxylic acids is melted in a molar ratio of 100/7 to 100/120 at temperatures of 230.degree. to 300.degree. C. while being mechanically mixed, in an inert gas atmosphere at ordinary pressure and in the absence of water, until the lactams have been reacted to at least 99%. Then, the polyether bearing the hydroxyl end groups and/or the amino end groups is added in a molar ratio of 1/0.95 to 1/1.05, based on the amount of dicarboxylic acid contained in the molten mixture. Homogenizing is then carried out with further mixing at 230.degree. to 290.degree. C. Lastly, a polycondensation is carried out to completion at 250.degree. to 290.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.