Fluidizing agent and method using said agent
US9290657B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 22, 2013 |
| Grant date | Mar 22, 2016 |
| Priority date | — |
| Expiry date | Mar 22, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L77/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present disclosure relates to a compound U comprising at least one urethane functional group, and its use as a fluidizing agent or fluidizing agent precursor in a process for preparing a polyamide article. The process comprises heating a composition comprising at least one polyamide PA and at least one compound U comprising at least one urethane functional group, at a temperature T, for a time t and at a pressure P, wherein the temperature T and the time t are such that CO2 is generated and the melt viscosity of the composition is decreased, in comparison with the melt viscosity of the composition without compound U, and recovering the article. The fluidizing agent can further enable the production of an article that has an unreduced density and/or in which the mean molar mass of the polymers of the composition is increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.