Process for forming a multilayer, coinjected article
US6562276B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2000 |
| Grant date | May 13, 2003 |
| Priority date | — |
| Expiry date | Mar 1, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2948/92904
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for coinjection-molding a multilayer article comprising coinjecting at a selected coinjecting temperature (i) a first outer polymer resin layer having a viscosity at the selected coinjecting temperature, and (ii) a second inner polymer resin layer having a viscosity at the selected coinjecting temperature, wherein the ratio of the outer polymer resin viscosity to the inner polymer resin viscosity at the coinjecting temperature is less than or equal to about 2 and the coinjecting temperature is above the melting temperature of the highest melting resin and below the degradation temperature of the lowest degrading resin to form a multilayer article. Processes for coextrusion are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.