Maleimide-based copolymer, method for producing same, and resin composition obtained using same
US12129327B2 · kind B2 · utility
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Key dates
| Filing date | Jan 27, 2023 |
| Grant date | Oct 29, 2024 |
| Priority date | — |
| Expiry date | Jan 27, 2043 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/3005
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This maleimide-based copolymer contains 40-60 mass % of aromatic vinyl monomer units, 5-20 mass % of vinyl cyanide monomer units, and 35-50 mass % of maleimide monomer units, and is such that a 4 mass % tetrahydrofuran solution of the copolymer has a transmittance of 90% or more for light having a wavelength of 450 nm at an optical path length of 10 mm, and the residual maleimide-based monomer amount is less than 300 ppm. This maleimide-based copolymer preferably further contains 0-10 mass % of unsaturated dicarboxylic acid anhydride monomer units, and preferably has a glass transition temperature of 165° C. or higher.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.