| 摘要 |
<p>PROVIDED IS A CURABLE POLYORGANOSILOXANE COMPOSITION WHICH ADVANTAGEOUSLY FORMS A CURED PRODUCT SUITABLE FOR LED OR OPTICAL LENS, WHEREIN THE CURED PRODUCT HAS EXCELLENT LIGHT TRANSMISSION PROPERTIES IN A SHORT WAVELENGTH REGION, I.E., IN THE BLUE TO ULTRAVIOLET REGION AND IS UNLIKELY TO SUFFER YELLOWING DUE TO EXPOSURE TO HEAT. A CURABLE POLYORGANOSILOXANE COMPOSITION COMPRISING: (A) ALKENYL GROUP-CONTAINING POLYORGANOSILOXANE WHICH COMPRISES (A1) BRANCHED POLYORGANOSILOXANE COMPRISING AN SiO4/2 UNIT AND AN R3SiO1/2 UNIT, AND OPTIONALLY AN R2SiO UNIT AND/OR AN RSiO3/2 UNIT (WHEREIN EACH R INDEPENDENTLY REPRESENTS AN UNSUBSTITUTED OR SUBSTITUTED MONOVALENT HYDROCARBON GROUP), WHEREIN AT LEAST THREE R PER MOLECULE ARE ALKENYL GROUPS, AND OPTIONALLY (A2) LINEAR POLYORGANOSILOXANE HAVING R BONDED TO A SILICON ATOM (WHEREIN R IS AS DEFINED ABOVE), WHEREIN AT LEAST TWO R PER MOLECULE ARE ALKENYL GROUPS, WHEREIN 90 MOL% OR MORE OF THE R PRESENT IN COMPONENTS (A1) AND (A2), EXCLUDING ALKENYL GROUPS, ARE METHYL GROUPS; (B) POLYALKYLHYDROGENSILOXANE COMPRISING AN SiO4/2 UNIT AND AN R3(CH3)2SiO1/2 UNIT (WHEREIN EACH R3 INDEPENDENTLY REPRESENTS A HYDROGEN ATOM OR A METHYL GROUP), WHEREIN AT LEAST THREE R3 PER MOLECULE ARE HYDROGEN ATOMS; AND (C) A PLATINUM GROUP METAL COMPOUND.</p> |
