Filled thermoplastic
US3976608A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1975 |
| Grant date | Aug 24, 1976 |
| Priority date | — |
| Expiry date | Apr 15, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2325/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A filled thermoplastic composition is produced by first preparing a masterbatch of an impact polystyrene, a rubber, an oil and a filler and by secondly mixing the masterbatch with a polystyrene composition. The filled thermoplastic composition has acceptable properties. The present invention is directed to a process for the production of filled thermoplastic compositions. More particularly, it is directed to filled polystyrene compositions. For many years, the cost of polystyrene and impact polystyrene was not much higher than the cost of fillers conventionally used in the rubber industry. From the rubber industry, it has been well known that the cost of incorporating fillers into rubber is significant but is a necessary feature to achieve the required strength properties in the rubber compounds. Such incorporation of fillers into rubber requires the use of high shear mixing equipment. Plastics generally do not require the presence of filler to achieve good strength properties. All of the above have combined in the past such that the thermoplastics industry has used very few fillers and then usually only in small amounts for limited very special applications. Consequently, the plas…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.