Core member for fabrication of shaped plastic
US4939020A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 24, 1988 |
| Grant date | Jul 3, 1990 |
| Priority date | — |
| Expiry date | Jun 24, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/652
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention core member is prepared by treatment of non-woven fabric with a coating composition which comprises an emulsion-form curable vinyl polymer, heat-expandable microspheres, and a thiocyanate compound, and this core member is advantageously utilized with use of liquid-form unsaturated polyester-based molding composition which contains a cobalt-containing compound as cure accelerator, wherein color development becomes available when said unsaturated polyester-based liquid composition infiltrates into voids of the core member, due to encounter of the thiocyanate compound with the cobalt-containing compound, thereby infiltration of said liquid composition is monitored by use of the color development.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.