| http://www.w3.org/ns/prov#value | - vel holographic articles containing crosslinked matrix formed from formulations containing an excess amount (i.e. non-stoichiometric amount) of polyisocyanates to polyols, which provide several advantages to the holographic performance of these media.Applicants further found that when the polyols contain compounds such as fluorine, chlorine and silicon, the articles formed would also be optically
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