Abstract
In 1986, 4,4'-bis (sec-butylamino) diphenylmethane, or UNILINK 4200, was introduced as a curing agent for polyurethanes. At this time, it was shown to offer some unique properties due to its secondary alkyl group which can func tion as an internal plasticizer. A liquid at room temperature, this material was also found to blend easily with most other curing agents.
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