Compositions: coating or plastic – Coating or plastic compositions – Alkali metal silicate containing
106 47Q, 106 47R, 106 52, C03C 312, C03C 330, G02B 5128
Glass microspheres having an index of refraction of 2.7 or higher are prepared by (1) forming the microspheres from compositions based principally on 65-85 weight-percent Bi.sub.2 O.sub.3 and 5-35 weight-percent TiO.sub.2, and (2) rapidly heating the microspheres after they have been initially formed to cause an internal structural rearrangement that raises their index. Such microspheres are useful to form retroreflective products having superior properties and a more simplified construction.
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Laird James A.
Tung Chi F.
McCarthy Helen M.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Tamte Roger R.
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