Method for producing molded crystalline resin article
US6423263B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 1998 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | Feb 24, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/3055
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
To provide a method for producing a molded crystalline resin article which enables a higher crystallization degree and to mass-produce the molded crystalline resin articles. The method comprises molding a molded resin article from a thermoplastic resin containing a crystalline resin followed by performing a heating process to obtain a molded crystalline resin article having a surface layer whose crystallization index is 0.9 or higher when determined by IR spectrometry. It is preferable that the temperature of the heating process is within the range of 20° C. lower than the crystallization temperature of the molded resin article to 30° C. higher than the crystalline temperature, and that the crystalline resin is a polypropylene resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.