| 摘要 |
Provided is an energy ray-curable elastomer composition which can increase the inter-crosslinking point molecular weight without changing the kind of an energy ray-curable compound before cured and which provides an oligomer-cured substance having a braking elongation compatible with a processability, to be specific, an energy ray-curable elastomer composition containing (A) an energy ray-curable compound having a (meth)acryloyl group and (B) a polythiol compound having 2 to 6 mercapto groups in a molecule, wherein a functional group number ratio of the (meth)acryloyl group in the above composition to the mercapto group in the component (B) is 100:0.1 to 100:5n (n is the number of the mercapto group in a molecule of the polythiol compound). Further, provided are a material for a gasket containing the energy ray-curable elastomer composition described above which provides a gasket enhancing a braking elongation without damaging a processability and other necessary physical properties and making it possible to inhibit cracking, breaking and the like from being caused, a gasket comprising a substance obtained by curing the above material for a gasket by an energy ray and a hard disk device prepared by using the above gasket.
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