Block copolyetheramides flexible at low temperatures
US4717763A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1985 |
| Grant date | Jan 5, 1988 |
| Priority date | — |
| Expiry date | Dec 11, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G69/34
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Homogeneous, flexible block copolyetheramides having a melting/softening point of at least 170.degree. C., a glass transition temperature, measured at ZHE, of at most -5.degree. C., and a melt viscosity of at least 500 poises, said block copolyetheramides comprising the oxyacid, or alkali or alkaline earth metal, such oxyacid salt catalyzed polycondensate of admixture of (i) a lactam having from 4 to 12 carbon atoms with (ii) a solution of (iii) a salt of a fatty acid dimer and a polyoxyalkylenediamine, or mixture thereof, with a triamine, in (iv) a solvent medium which comprises (1) a mixture of water and an aliphatic alcohol having less than 5 carbon atoms, (2) a water/alcohol/lactam mixture wherein the alcohol and lactam are as in (1), (3) a melt of said lactam, or (4) a mixture of water and a water-soluble such lactam, the stoichiometry of said salt (iii) having been carefully pre-adjusted such that the pH thereof is essentially that as exists at the equivalence point thereof, and said oxyacid comprising at least one acid function having a pKa of no greater than 4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.