Use of styrene and maleic anhydride copolymers as dispersing agents and/or for treatment of mineral fillers and thermoplastic compounds containing same
US5786415A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1996 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Dec 16, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/61
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a method of dispersing or treating a mineral filler into a thermoplastic resin; the dispersing agent or agent for treatment of a mineral filler is a styrene-maleic anhydride copolymer, having an weight average molecular weight preferably between 1000 to 3000; the thermoplastic resin is selected from (a) a hydrocarbon homopolymer without an aryl group, (b) a copolymer without an aryl group, and with a molecule comprised of carbon, hydrogen and oxygen in which the content of oxygen atoms does not exceed 22% by weight or (c) a mixture of the above described homopolymer and copolymer; the mineral fillers are basic or have surfaces that have free hydroxyl groups. The present invention relates also to thermoplastic compounds which are highly filled, stable, fluid and homogeneous and which contain mineral agents; further these compositions are useful in the fabrication of plastic products.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.