专利号:JP-4120709-B2 优先权日:1995-11-07 标 题:Synthesis of organic diurethanes and / or polyurethanes and their use for the production of diisocyanates and / or polyisocyanates
专利号:JP-H11514659-A 优先权日:1995-11-07 标题:Synthesis of organic diurethanes and / or polyurethanes and their use for the production of diisocyanates and / or polyisocyanates