Transfer member for printing systems
AssigneeLanda Labs (2012) Ltd.
InventorsBenzion Landa, Sagi Abramovich, Amit Haviv
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Abstract
There is disclosed a layered article that can be used in indirect printing, in analog or digital processes. The layered article, when configured as a transfer member, may serve to receive an ink in any form, allow the ink to be treated so as to form an ink image, and permit the application of the ink image on a substrate. The transfer member comprises a support layer and an imaging layer, which may be formed of a silicon matrix including dispersed carbon black particles. Methods for preparing the same are also disclosed.
Claims23
A method for preparing a layered article, the layered article comprising a functional layer, the method comprising:
- a) providing a support layer adapted to form a rear side of the layered article, the rear side being opposite a first side;
- b) providing a functional layer, the functional layer including a hydrophobic silicone matrix comprising hydrophilic carbon black particles non-covalently dispersed therein;
- and
- c) bringing into contact the support layer and the functional layer with one another so as to form the layered article, said contacting optionally being in presence of a priming layer and/or an adhesive layer disposed on and/or facing the first side of the support layer;
- wherein the hydrophilic carbon black particles have at least one of the following properties:
- i) an oxygen content on the surface of the carbon atoms between 1.0 wt. % and 40 wt. %;
- ii) a volatile components content between 1.5 wt. % and 50 wt. %;
- iii) a surface zeta potential between −70 mV and −15 mV, as measured at a pH of at least 8.0;
- iv) a pH between 2.0 and pH 8.5, when measured for an aqueous dispersion of said hydrophilic carbon black particles;
- v) a dibutyl phthalate (DBP) absorption value between 50 mL/100 g and 200 mL/100 g;
- vi) a specific surface area between 50 m2/g and 650 m2/g, as determined by BET nitrogen absorption;
- vii) an ID/IG ratio of at least 0.8, wherein ID and IG represent the peak intensity maxima of D-band and G-band, respectively, as determined by Raman spectroscopy;
- viii) an average primary particle size (Dv50) of at most 100 nm;
- ix) a predominant secondary particle size (Dv90) of at most 5 μm;
- x) a predominant secondary particle size (Dv90) of at most 1000 nm;
- and
- xi) the hydrophilic carbon black particles contain at least one type of functional group selected from the group consisting of epoxy, hydroxy and carboxylic moieties, as detected by Fourier-transform infrared (FTIR) spectroscopy.
A layered article comprising a) a support layer;
- and b) a functional layer, disposed on the support layer, the functional layer comprising a cured hydrophobic silicone matrix comprising hydrophilic carbon black particles non-covalently dispersed therein, wherein:
- a) the hydrophobic silicone matrix is formed from functionalized silicone pre-polymers selected from the group consisting of liquid silicone resins (LSR), room temperature vulcanization (RTV) silicones, polydialkyl solioxanes (PDAS), or polydimethyl siloxanes (PDMS) silicones, provided that the silicone pre-polymer is not a fluorosilicone;
- and
- b) the silicone pre-polymers are functionalized by the at least one reactive group selected from the group consisting of amine, vinyl, silane, alkoxy, amide, and acrylate moieties.
A layered article comprising:
- a) a support layer;
- and b) a functional layer, disposed on the support layer, the functional layer comprising a cured hydrophobic silicone matrix comprising dispersant-laden hydrophilic carbon black particles non-covalently dispersed therein;
- wherein a dispersant of the dispersant-laden hydrophilic carbon black particles has at least one carbon-black-affinic moiety selected from an amino-moiety, an acrylate-moiety and an epoxy-moiety.
Dependencies are inferred from the claim text.