Acrylic sheet having uniform distribution of coloring and mineral filler before and after thermoforming
US5985972A · kind A · utility
7Cited by
3References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 7, 1997 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | Jul 7, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K2003/2227
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention is drawn to a composition and thermoformable sheets and articles made therefrom. In the present invention, ranges of chain-transfer agents, thixotropic agents, and mineral filler content are balanced to minimize migration or maldistribution of coloring matter and mineral filler during curing of methyl methacrylate in a syrup and also during subsequent heating and deformation in thermoforming, to achieve constancy of impact resistance and improve stability of patterns even in deformed portions of formed sheets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.