Homogeneous block copolyetheramides flexible at low temperatures
US4581440A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1984 |
| Grant date | Apr 8, 1986 |
| Priority date | — |
| Expiry date | Jun 28, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G69/40
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Novel block copolyetheramides which are homogeneous and flexible at low temperatures and have melting or softening points of at least 170.degree. C., glass transition temperatures of at most -5.degree. C. and viscosities in the molten state of at least 500 poises, are facilely prepared by copolymerizing (I) admixture of a lactam having from 4 to 12 carbon atoms with a solution of a salt of a fatty acid dimer and a polyoxyalkylenediamine in a solvent medium comprising (i) a mixture of water and an aliphatic alcohol having less than 5 carbon atoms, (ii) a water/alcohol/lactam mixture, (iii) a lactam in molten state or (iv) a water/lactam mixture wherein the lactam is water soluble, the stoichiometry of said salt being adjusted such that the pH thereof is within .+-.0.05 pH units of its equivalence point and (II) a minor amount of a strong inorganic oxyacid or a strong organic oxyacid other than a carboxylic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.