Printed solvent release

With printing inks, the parameter of the resin has not been generally used as a measure of performance. However it is apparent that the resins with the best solvent release are those with the greatest spread between the parameter of the resin and the residual solvent. Complete miscibility is regarded as essential, but since drying is often at high temperatures, this requirement is not unduly severe. 

A very important property of polymers used in printing inks and overprints, especially for plastic substrates, is their ability to release solvents. Some polymers retain a small percent of solvent, thereby causing poor film characteristics or an objectionable residual odor. The propionates have been found to have excellent solvent-release characteristics and are used in laminating inks for plastic because of this property. Figure 7 compares solvent release of CAP-504-0.2 with that of other polymers used in plastic coatings. 

Table 14.23.1. Reported solvent releases from the printing and publishing industry in 1995 [Data from Ref. 2]...

Solvent Recovery. Most of the activated carbon used in gas-phase applications is employed to prevent the release of volatile organic compounds into the atmosphere. Much of this use has been in response to environmental regulations, but recovery and recycling of solvents from a range of industrial processes such as printing, coating, and extmsion of fibers also provides substantial economic benefits. 

Molecular imprinted polymers MIPs exhibit predetermined enan-tioselectivity for a specific chiral molecnle, which is nsed as the chiral template dnring the imprinting process. Most MIPs are obtained by copolymerization from a mixture consisting of a fnnctional mono-nnsatn-rated (vinylic, acrylic, methacrylic) monomer, a di- or tri-nnsatnrated cross-linker (vinylic, acrylic, methacrylic), a chiral template (print molecnle) and a porogenic solvent to create a three-dimensional network. When removing the print molecnle, chiral cavities are released within the polymer network. The MIP will memorize the steric and functional binding featnres of the template molecnle. Therefore, inclusion of the enantiomers into the asymmetric cavities of this network can be assumed as... 

Figure 2 (A) Release profiles of levofloxacin from three implants I, n, and HI, with the stmctures shown helow. Implant I prepared by three-dimensional printing gives the profile labeled a, while b represents the behavior of implant I made by a conventional process implant II gives plot c, while implant 111 gives plot d. (B) Experimental (two-dimensional) geometrical stmctures as shown. These allow entrance of solvent from one upper or lower) face and produces the release patterns as shown. Source Part A from Ref. 33, and part B fi-om A.T. Florence (unpublished).

Gaudioso (j>) proposed a theory of ink release from this type of plate, suggesting that ink solvent diffusion from the ink into the plate non-printing area is essential to the formation of a weak fluid boundary layer. This allows more complete removal of residual ink from these areas. 

Chem. Descrip. PEG 300 USP CAS 25322-68-3 EINECS/ELINCS 220-045-1 Uses Solubilizer, carrier, plasticizer, solvent for cosmetics, pesticides, metalworking lubricants, ints, resins, paper, film, printing inks, liq. pharmaceutical preps., ointment bases rubber release textile aux. vise, modifier for brake fluids intermediate for PEG esters, PU foams binder for capsules/pills... 

Chem. Descrip. Ethyl lactate CAS 97-64-3 EINECS/ELINCS 202-598-0 Uses Precision cleaning solvent for wide variety of contaminants solvent for electronics, paints/coatings esp. waterborne and high-solids sterns, printing inks, cleaning agents, mold release agents food additive... 

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