Latexes photoinitiators

Fig. 2.3.4 Film formation of a photoinitiated the lower surface (left) after a 90 min induction cross-linking latex coating as measured by period due to oxygen absorption. The profiles CARField. (a) The coating is exposed to air shown were recorded 10, 90, 100 and 110 min (evaporation) and light from above, (b) A sam- and 2, 3, 4, 5, 6 and 17 h after casting the layer, pie comprising a combination of only polymer (d)The full formulation film forms in the central and water dries from the upper surface (right) layers first. In this final time series, the profiles as shown by a time series of profiles, recorded shown were recorded after 10 min (dotted at 10, 20, 30, 40, 50, 60, 70, 100 and 120 min trace, T) attenuated) and then, from the top after casting the layer, (c) A combination of down, 30, 60 and 90 min and 2, 3, 6 and 17 h polymer and photoinitiator only cures from after casting the layer.

In conjunction with hydrogen donors such as dimethylaniline and triethyla-mine, benzils and various quinones, such as anthraquinone, 9,10-phenanthrene quinone, and camphor quinone (see Chart 10.4), can be used as visible-light-sensitive photoinitiators [8]. Some of these compounds are used to cure dental restorative systems (see Section 11.3). Another application concerns the curing of waterborne pigmented latex paints, which do not contain volatile organic compounds (VOCs) [48]. 

Figure 1 Schematic representation of the synthesis of defined SPB In the first step, a PS latex is generated, which is then covered by a thin layer of the photoinitiator 2-[p-(2-hydroxy-2-methylpropiophenone)]-ethylene glycol methacrylate (HMEM) in the second step. Photoinitiation in the presence of water-soluble monomers, such as acrylic acid, leads to polyelectrolyte chains grafted onto the surface of the core particles in the third step. Taken with permission from Ballauff, M. Macromol Chem. Phys. 2003, 204, 220. ...

No.22, 31st Oct.2000, p.8443-52 DEPTH PROFILES OF POLYMER MOBILITY DURING THE FILM FORMATION OF A LATEX DISPERSION UNDERGOING PHOTOINITIATED CROSS-LINKING... 

Guo et al. [150] described the synthesis and characterization of latex particles consisting of a PS core and a shell of linear PAA chains. In the first step, PS cores were covered by a thin layer of a photoinitiator 2-[p-(2-hydroxy-2-methylpropiophenone)] ethylene glycol-methacrylate (HMEM) by means of a seeded emulsion polymerization process. The polymer formed by HMEM on the surface acted as a photoinitiator in the next step, in which acrylic acid was nsed as a water-soluble monomer. The PAA chains were affixed on the surface by means of an attaching from technique that led to particles with well-defined morphology and narrow size distribntion. 

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