Non-Isocyanate, Non-Mercury Polyurethane Encapsulation ResinsAuthors: Xiaoping Lei, Ph.D., and Darren Hodson
Company: Electrolube Ltd.
Date Published: 10/14/2012 Conference: SMTA International
However, there are two major issues with production of polyurethane polymers. One is obviously the toxicity of the isocyanate and the other is the fact that the most effective catalyst used for the polymerisation contains mercury. These issues become even more pronounced with its use in the electronics industry because the polymerization process normally takes place in situ where the operators have to be exposed to such conditions. To overcome these drawbacks the R&D group in HK Wentworth Limited have carried out intensive research and have now developed a novel system to produce polyurethane polymer without using isocyanate and mercury catalyst. This paper will compare the properties of the polyurethane material cured using the novel non-toxic system and that made from the conventional cure chemistry.
Non-isocyanate, Urethane linkage, Carbamate groups, Mercury free, Encapsulation resin
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