| 摘要 |
<p>Compositions of a polyphenylene ether resin and a rubber modified, high impact polystyrene resin (HIPS) are made by a process in which styrene monomer, is polymerized in the presence of rubber to achieve an extent of monomer conversion of not less than about 90 per cent and thereby achieve crosslinking of the rubber, after which it is solution blended in a mutual solvent with a polyphenylene ether resin and the resulting polymer blend is devolatilized. The polymer composition exhibits better properties upon molding because the crosslinked rubber particles of the HIPS are more solvent resistant and better able to resist shearing during the solution blending and isolation stages, in comparison with a composition in which the styrene has undergone less than about 90 per cent conversion and the HIPS rubber particles are, for the most part, not crosslinked as a result.</p> |
