Improving mechanical properties and chemical resistance of ink‐jet printer color filter by using diblock polymeric dispersants

Abstract

The diblock copolymers of polystyrene and poly(tert‐butyl acrylate) (PSt‐b‐PtBA) with various molecular weights and hydrophobic/hydrophilic (styrene/acrylic acid) chain length were prepared by atom transfer radical polymerization (ATRP). Selective hydrolysis of the diblock copolymers (PSt‐b‐PtBA) resulted in amphiphilic block copolymers of polystyrene and poly(acrylic acid) (PSt‐b‐PAA). The amphiphilic block copolymers of PSt‐b‐PAA with average molecular weight (Mn) <7500 were proved to be critical in dispersing the pigments of UV curable ink‐jet inks for manufacturing the color filter. Incorporating DB2 diblock copolymer dispersants with styrene/acrylic acid ratio at 1.5 allowed more UV curable compositions in the red and blue inks without deteriorating pigment dispersing stability and jetting properties of the ink‐jet inks. The ink drops can be precisely ejected into the tiny color area. Better properties of the cured red stripe such as nanoindentation hardness and chemical resistance were found. The competing absorption of UV light by the blue pigment hindered the through cure of monomers near the interface between glass substrate and the blue stripe. This leads to lower hardness and poor chemical resistance of the UV cured blue stripe. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 3337–3353, 2005

Inkjet Printing of Functional Materials for Optical and Photonic Applications

“…Additives such as hyperbranched polymers have been added to tune the ink rheology and therefore its printability [167]. Diblock copolymers have been included too as dispersants in ink pigmented formulations leading to improvements of the mechanical properties and chemical resistance of printed colour filters [168]. Improvements in transmittance, colour purity as well as spectral and thermal stability have been sought by the inclusion of nanoparticles [169,170] or specifically designed dyes such as perylenes and phthalocyanines [171].…”

Breadth of glass transition temperature in styrene/acrylic acid block, random, and gradient copolymers: Unusual sequence distribution effects

“…We have focused on S/AA copolymers in part because of recent interest in exploiting such copolymers in a broad array of applications. For example, S/AA block copolymers have been used or are being studied as dispersing agents36 and in the production of hybrid films,37 substrates for enzyme immobilization,38 nanoreactors,39 and nanostructured devices,40 and S/AA random copolymers have been studied for reactive compatibilization of immiscible blends41 and are used as precursors to ionomers 42. In the present study, we show that the T g breadths of S/AA gradient copolymers are not limited to be located between the T g s of S‐rich and AA‐rich domains in ordered diblock copolymers (or between the T g s of PS and poly(acrylic acid) (PAA)) but instead can extend to temperatures higher than the T g of the AA‐rich domains in S/AA block copolymers or of PAA.…”

P‐66: Large Area Color Filter Fabrication by Using Ink‐Jet Printing Technology

“…The NTSC value was estimated at 73%. Additional ribs on BM [5,6] have been proposed in previous study in order to prevent the overflow inks to neighboring subpixels. The additional photolithography process, however, was a big drawback of this approach.…”