The present invention relates to an aqueous coating composition comprising a multi-aziridine compound and a carboxylic acid functional polymer, characterized in that (i) the composition is an aqueous dispersion having a pH ranging from 8 to 14, (ii) the aqueous dispersion comprises particles X which particles X comprise multi aziridine compound and particles Y which particles Y comprise carboxylic acid functional polymer, and (iii) said multi-aziridine compound has: a) from 2 to 6 of the following structural units A: b) one or more linking chains wherein each one of these linking chains links two of the structural units A; and c) a molecular weight in the range from 500 to 10000 Daltons.

##STR00001##

The present invention relates to the field of security inks suitable for printing security features on substrates, in particular on security documents or articles as well as security features made from said security inks, and security documents comprising a security feature made from said security inks. In particular, the invention provides UV-Vis radiation cationically curable security inks and UV-Vis radiation curable hybrid security inks comprising an ink vehicle and pigments comprising a flake-shaped non-metallic or metallic substrate comprising one or more at least partial coating layers, an at least partial surface treatment layer made of one or more surface modifiers based on perfluoropolyethers.

The present invention relates to the field of security inks suitable for printing security features on substrates, in particular on security documents or articles as well as security features made from said security inks, and security documents comprising a security feature made from said security inks. In particular, the invention provides UV-Vis radiation cationically curable security inks and UV-Vis radiation curable hybrid security inks comprising an ink vehicle and pigments comprising a flake-shaped non-metallic or metallic substrate comprising one or more at least partial coating layers, an at least partial surface treatment layer made of one or more surface modifiers based on perfluoropolyethers.

Digital ink formulations that cure by the application of light emitting diode (LED) energy are described. Also described are methods of bonding the LED-curable formulations onto substrates.

Digital ink formulations that cure by the application of light emitting diode (LED) energy are described. Also described are methods of bonding the LED-curable formulations onto substrates.

A dual-cure method for forming a solid polymeric structure is provided. An end-capped, imide-terminated prepolymer is combined with at least one photopolymerizable olefinic monomer, at least one photoinitiator, and a diamine, to form a curable resin composition, which, in a first step, is irradiated under conditions effective to polymerize the at least one olefinic monomer, thus forming a scaffold composed of the prepolymer and the polyolefin with the diamine trapped therein. The irradiated composition is then thermally treated at a temperature effective to cause a transimidization reaction to occur between the prepolymer and the diamine, thereby releasing the end caps of the prepolymer and providing the solid polymeric structure. A curable resin composition comprising an end-capped, imide-terminated prepolymer, at least one photopolymerizable olefinic monomer, at least one photoinitiator, and a diamine, is also provided, as are related methods of use.

A chip-embedded printed circuit board includes a cavity in a printed circuit board, a chip in the cavity of the printed circuit board, and a thixotropic dielectric filler in a gap in the cavity to seal the chip in the printed circuit board.

A chip-embedded printed circuit board includes a cavity in a printed circuit board, a chip in the cavity of the printed circuit board, and a thixotropic dielectric filler in a gap in the cavity to seal the chip in the printed circuit board.

Provided is a curable water-based composition including water, a polymerizable compound (A), and a polymerization initiator (C). The polymerizable compound (A) contains an acrylamide compound (A1) represented by General formula (A1) below.

##STR00001##

In the General formula (A1), X represents an alkylene group containing from 1 through 6 carbon atoms, and Y represents a group represented by General formula (A1a) below or General formula (A1b) below,

##STR00002##

In the General formula (A1a), R.sup.1 represents an alkyl group containing from 1 through 10 carbon atoms, and * represents a bonding site with X,

##STR00003##

In the General formula (A1b), R.sup.1 represents an alkyl group containing from 1 through 10 carbon atoms, and * represents a bonding site with X.

Disclosed are embodiments of 3D printing compositions that incorporate light scattering and wavelength-shifting metal nanoparticles, and systems and methods of using the 3D printing compositions. In some embodiments, the 3D printing compositions containing metal nanoparticles cure faster upon exposure to UV radiation. In some embodiments, the 3D printing compositions containing metal nanoparticles scatter incoming UV light throughout printed layers of the 3D printing compositions. It is proposed that metal nanoparticles produced by high energy methods possessing smooth spherical morphology and narrow size distributions can be integrated into 3D printing compositions to mitigate the risk of over-curing due to the light-scattering and/or down-shifting effect of the nanoparticles. A method for adding the nanomaterials to the 3D printing compositions in a non-interruptive process is also disclosed.