Process for preparing a molding composition having improved flowability
US5709941A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 4, 1996 |
| Grant date | Jan 20, 1998 |
| Priority date | — |
| Expiry date | Nov 4, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2978
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for rapidly improving the flowability, in pellet form, of a molding composition is disclosed. Accordingly, the crystalline content of an amorphous or a semi-amorphous version of a crystallizable thermoplastic resin is increased by subjecting the resin to infra-red radiation to an extent which induces the formation of crystals in the irradiated amorphous resin or the increase of the level of crystals in the semi-amorphous irradiated resins. The resin modified by the inventive process is rendered more suitable for processing: in dried, pellet-form, the modified resin is characterized by its improved flowability. An article molded from the thus modified resin exhibits better properties than does a corresponding article made from a unmodified resins which has been subjected to similar drying conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.