UV curable acrylates

The polymer layer, fypically between 250 and 1,000 nm thick, is deposited by flash evaporahon of a multicomponent proprietary UV curable acrylate-based resin system. The requirements for the deposited film are ... 

Oxo-l,3-dioxolan-4-yl methyl L CHj-O-C-CI 23385-72-0 0 v° Dec. UV curable acrylic resins Hydro gels Blowing agents for plastic foams Foods additives... 

Another key step is the proper development of surface chemistry to attach addressable probes onto different membrane sensors. This can be achieved by patterning UV-curable acrylic-based polymers inside the microfluidic channel doped with different monomers containing charged or functional groups. Such polymers are ion-selective and provide reactive chemical groups on their surfaces for the attachment of DNA/RNA probes. The functionality of aU the devices proposed here relies on the ion-selectivity of the polymeric material, which is less dependent on... 

A UV-curable acrylate system usually contains four main components prepoly-mer(s), monomer(s), photoinitiator(s), and additives. A fully formulated EB-curable system is not merely a UV system without photoinitiator but the same principles apply and the same raw materials are used. 

As an alternative to the above solutions, oxide glass overcladding with a phosphate jacket has been proposed for the so-called FLOX fibers (Vacha et al. 1987). Although diamond-like carbon (Stein et al. 1983, Tran et al. 1984) and other types of ceramic or metallic hermetic coatings have also been investigated, UV-curable acrylate coatings appear to be currently preferred for HMFG fibers such as those produced by Infrared Fiber Systems Inc., U.S.A. (IFS). 

Chem. Descrip. 2,2-Diethoxyacetophenone CAS 6175-45-7 EINECS/ELINCS 228-220-4 Uses Photoinitiator for UV-curable acrylate-based coatings, adhesives, and inks... 

CAS 10287-53-3 EINECS/ELINCS 233-634-3 Uses Synergist to improve effectiveness and efficiency of photoinitiators used in UV-curable acrylate-based adhesives, printing inks, photoresist, wood varnishes, and metal coatings Properties Wh. to off-wh. crystalline solid sweet odor m.w. 193.25 m.p. 61-64 C 0.2% max. moisture Toxicology TSCA listed... 

The O2 inhibitory effect, which is illustrated in Figure 6 for a typical UV-curable acrylate resin, is particularly important in thin films and at the surface of samples in contact with air. It becomes more pronounced when the light intensity is decreased because of the increasing duration of the polymerization, time during which atmospheric oxygen diffuses into the sample. 

When using a module with 128 cross-junctions, it was possible to produce monodisperse particles from a UV-curable acrylate monomer with a diameter of 96.4 pm and a throughput of 0.3kgh b The photo-polymerization, in this case, was carried out off the module. 

Even more important to the formulation is a photoinitiator for the UV curables or an accelerator for the EB curables. These do not necessarily have to be a separate ingredient, but they may be a molecular modification of a resin or monomer ingredient. A typical photoinitiator for a UV curable acrylic system is based on an aromatic keto compound, and for an epoxy system it is based on a diazonium or a sulfonium compound. 

Increasing use of UV-curable acrylates is found in the assembly of medical, automotive, electrical, electronic and optical devices. Dual cure mechanism (UV and anaerobic) adhesives are often used for the assembly of ammunition and automotive air bag inflators. 

During the past 15-20 years, the use of UV-curable acrylates in inks and coatings has increased tremendously. In the can-coating industry, UV-printing inks are used on beverage and beer cans as well as on crown caps and aerosol containers. UV-curable acrylate coatings are used as wood finishes, mat varnishes, parquet varnishes and sealers, and as varnishes and coatings in the manufacture of furniture (Bjorkner... 

Rietschel RL, Huggins R, Levy N, Pruitt PM (1984) In vivo and in vitro testing of gloves for protection against UV-curable acrylate resin systems. Contact Dermatitis 11 279-282 Zimmerman EH (1981) Letterflex in printers. Derm News ... 

Low shrinkage and good adhesion was also achieved by using waterbased UV-curable acrylate resins, like Laromer PE-55W from BASF, associated to Irgacure 2959 from Ciba SC as photoinitiator. After drying at 80°C, the tacky film obtained proved to be an excellent adhesive to assemble glass plates or transparent films by a short exposure to UV-radiation, which transforms the tacky resin into a low-modulus elastomer. The multiple-step processing can be represented schematically as follows ... 

Tomita, K., UV-curable acrylic adhesives composition, Japanese Patent JP 2000 109779, CA-2000-249928, 2000. 

Decker, C. and Moussa, K., UV-curable acrylic resins for production of glass laminates, J. Appl. Polym. Sci, 1995, 55, 359-369. 

Zollner, S., UV-curable acrylic pressure-sensitive adhesives. Features, Mechanisms, Milestones (pp. 543-549), Proc. RadTech Europe, Berlin, 1999. 

A recent application of photopolymerization is the protection of the surface of optical components made of polycarbonate or acrylic resins. The surfaces of these parts are vulnerable to scratches and attack by chemicals. Coating of the surface with a thin layer (2-4 pm) of a UV-curable acrylic coating may increase the abrasion resistance and the chemical inertness considerably. 

A standard UV-curable acrylate resin formulation consists of at least three ingredients a photoinitiator, an acrylate resin, and a reactive diluent. 

Source BASF Corp., Charlotte, NC, UV-Curable Acrylic Hot Melts for PSAs... 

UV-Curable Acrylic resins for PSAs, by Dr Karl-Heinz Schumacher, development chemist, BASF AC, Ludwigshafen, Germany and Tim Sanborn, technical adviser, BASF Corp., Charlotte, NC... 

Acrylated tackifying oligomers and UV-curable acrylic resins for PSA applications. 

These are another category of materials to the filler and pigment screens mentioned previously. These materials are generally organic and include derivitives of thiophen, benzotriazole and transition metal dithiocarbamates, e.g., Ferro 101, nickel dithiocarbamate. These substances are effective at concentrations of 0.1 % or less. UV curable acrylate coatings and inks have been used in the manufacture of printed polymer containers. 

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