发明授权
US4390640A Process for the production of optionally-foamed polyurethanes 失效
用于生产任选发泡聚氨酯的方法

Process for the production of optionally-foamed polyurethanes
摘要:
This invention relates to a process for the production of polyurethanes, particularly polyurethane foam moldings having a compact skin and a cellular core, using special tin activators.
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