Scratch-resistant PMMA and polycarbonate siloxane copolymer compositions
US10851235B2 · kind B2 · utility
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15Claims
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Key dates
| Filing date | Apr 17, 2020 |
| Grant date | Dec 1, 2020 |
| Priority date | — |
| Expiry date | Apr 17, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2203/16
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Thermoplastic compositions include: from about 62 wt % to about 99 wt % poly(methyl methacrylate) (PMMA) or copolymers thereof; and from about 1 wt % to about 38 wt % of a poly(carbonate-siloxane) copolymer having a siloxane content of from about 25 wt % to about 45 wt %. The compositions are scratch resistant. Scratch resistance may be determined as comprising a scratch depth of less than 20 micron (μm) as measured in accordance with the Erichsen scratch hardness test at a force of 4 Newton (N). Articles including the thermoplastic composition are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.