Pre-expanded particle of polyolefine and process for preparing the same
US4540718A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 29, 1984 |
| Grant date | Sep 10, 1985 |
| Priority date | — |
| Expiry date | Feb 29, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/09
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A pre-expanded particle suitable for foaming in a mold comprising polyolefin which has a characteristic property that an inclination of slope line obtained on a graph when logarithmic values of melt tension of the polyolefin are plotted as ordinate and reciprocals of absolute temperature at which the melt tension is measured are plotted as abscissa is less than 1,500 is provided. A foamed article produced from the pre-expanded particles has an excellent appearance, a flat surface and good mechanical strength, and is useful for wrapping material, insulating material, a container or a fender of cars. A process for preparing the above-mentioned pre-expanded particles is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.