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Bismuth light fastness

Bismuth vanadate pigments exhibit very good light fastness in both deep and pale shades. They show excellent weather resistance in full shades, and are superior to lead chromate in this respect. In full shades they are comparable with the best organic pigments and have the greatest durability in deep reductions. [Pg.13]

The mono-O-phenylation reaction of glycols discovered by David and Thieffry presents some characteristic features which are not compatible with the postulated covalent bismuth intermediate. (see section 6.3.2) The reaction is solvent-selective (methylene dichloride under reflux), light-catalysed (no reaction in the dark), and presents an induction period (2 hours in the case of the phenylation of 2,2-dimethylpropan-l,3-diol). Addition of small amounts of copper diacetate had a marked effect on the reaction. The reaction became fast reaction times can be as short as 15 minutes. Moreover, the copper-catalysed reaction is no more solvent selective nor light-catalysed. ... [Pg.192]

There are 11 concepts of small reactors without on-site refuelling that are currently being developed at different stages in the Russian Federation. Six of them are light water cooled reactors the UNITHERM (ANNEX II), the ELENA (ANNEX III), the VBER-150 (ANNEX IV), the ABV (ANNEX V), the KLT-20 (ANNEX VI), and the VKR-MT (ANNEX X). In addition, there is one small gas cooled fast reactor concept which is the BGR-300 (ANNEX Xm) two sodium cooled reactor concepts the MBRU-12 (ANNEX XVI), and the BN GT-300 (ANNEX XVItl) and one lead-bismuth cooled small reactor design, the SVBR-75/100 (ANNEX XIX). Finally, there is one non-conventional reactor concept the MARS (ANNEX XXVIII). [Pg.113]

Thermostable bismuth vanadate pigments are available today with a heat stability of 260 to 280 °C. They exhibit very good fastness to light and weathering in plastics for outdoor use. In weathering tests on plastics pigmented with 0.5 % cadmium yellow or 1 % bismuth vanadate, the bismuth vanadate pigment was superior both under artificial conditions (Xenotest, 4000 h) and outdoors (5 years). [Pg.14]


See other pages where Bismuth light fastness is mentioned: [Pg.16]    [Pg.1273]    [Pg.30]    [Pg.29]    [Pg.68]    [Pg.124]    [Pg.562]    [Pg.237]    [Pg.127]    [Pg.100]    [Pg.261]    [Pg.150]    [Pg.70]   
See also in sourсe #XX -- [ Pg.10 ]




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