Ultraviolet-curing composition
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United States of America Patent
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app pub date -
Jan 2, 2002
filing date -
Apr 3, 1998
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Abandoned
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Abstract
When dust or contaminants invade into a hard disk drive and adhere to the surface of a magnetic head, there arise operation errors in recording and reading out signals. Accordingly, it has been required to develop compositions containing little outgas components as ultraviolet-curing resins to be used in assembling hard disk drives. Means for Solution: As urethane (meth)acrylate in an ultraviolet-curing composition, use is made of a product obtained by an addition reaction between a polyisocyanate compound, which is produced by reacting a polyether or a polyester having a hydroxy group with a diisocyanate group, with a hydroxyalkyl (meth)acrylate. In the addition reactions, an organic zinc or an amine compound is used as a catalyst so as to give a composition free from organotin compounds.
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