Masterbatches for delustring polyamides
US4710535A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 9, 1986 |
| Grant date | Dec 1, 1987 |
| Priority date | — |
| Expiry date | Jun 9, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2477/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to masterbatches for delustring processable polyamides. They contain 50 to 90% of a copolyamide used as a binder and consisting of 30 to 100% of hexamethylene adipamide units and 0-70% of caproamide units and 10 to 50% by weight of anatase titanium dioxide coated with 0.01 to 1.5% of silica and 1 to 3% of alumina and treated with a polydimethylsiloxane oil present in a proportion of 0.2 to 10% by weight of TiO.sub.2. They are obtained by adding TiO.sub.2 powder into the autoclave immediately after the pressure release stage, when the reaction mass is still at a high temperature and before vacuum is applied. The masterbatches according to the invention may be introduced directly into the liquid stream of the polymer to be spun.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.