Uv laminating adhesives

Cationically cured UV laminating adhesives based on cycloaliphatic epoxies are emerging as an alternative to solvent-hased adhesives. The dark cure of cationics allows UV exposure and post lamination in hne. This process does not require UV exposure through the plastic barrier material. 

In contrast to UV-laminated adhesives, radiation is appUed directly to the photosensitive resin, without having to penetrate through another material, very much... 

New quick-set 2K UV laminating adhesive systems for food flexible packaging... 

New Quick Set 2K UV Laminating Adhesive Systems for Food Flexible Packaging, Dr Albert Lin, Dr David Meloon, Jeff Flamric, Sovereign Specially Chemicals, lnc./Flenkel-US, US... 

Albright LD, Lamb KT, Carroy AC, et al. Cationic UV laminating adhesives. In Proceedings of the RadTech America. 1998 166—169. 

Laminating adhesives generally bond clear laminate plastic films. As long as the films are clear, the adhesive can be cured by UV energy if they are opaque, electron beam radiation is a better choice. 

Table 7.3 Formulation for PSA-Type UV Curable Laminating Adhesive. ..149...

Ultraviolet-curable laminating adhesives use cationic chemistry and visible initiating systems to solve laminating problems with polyester films, which absorb most UV radiation.15... 

Advantages of EB-curable over UV-curable laminating adhesives are 19... 

Uses Urethane-acrylic, solv. resist, aid, abrasion resist, aid in coatings, screen inks, overprint varnishes, wood coatings, plastic film, laminating adhesives, floor tile, and metal coating finishes Features Resilient, nonyel. supplied as base resin or as resin/monomer blends which offer resilience, water-wh. clarity, and exc. heat and light stability to UV/EB-cured prods. 

Uses Epoxy-actylic tor UV- and EB-cured coatings (wood, metal, plastic), inks (screen, litho), laminating adhesives, overprint varnishes, parquet flooring... 

Uses Used in UV-cured lithographic and screen inks for metals, plastics, and paper, laminating adhesives, clear coatings Features Fast UV cure, good adhesion... 

Chem. Descrip. Chlorinated polyester diluted 40% with OTA-480 Uses Used in UV cured dry lithographic inks for metals, plastics, and paper, laminating adhesives, clear coatings Features Fast UV cure, good adhesion to plastics Properties Gardner 3 color vise. 40,000 ops acid no. 15 tens. str. 3700 tens, elong. 22%... 

Chem. Descrip. Trifunctional polyester acrylate oligomer Uses Diluent for UV/EB-cured prods., flexographic and screen inks, coatings (paper, wood, plastics), paper upgrading, high vise, systems, EB-cured paper-foil laminating adhesives, solventless spray and ttow coaler applies. 

Chem. Descrip. Acid functional monoactylale Uses Film-former, adhesion promoter, flow aid, leveling agent in radiation-curable coalings and inks, etch and plate resists, UV/EB pressure-sensitive and laminating adhesives... 

Chem. Descrip. Proprietary acrylate monomer Uses Flow aid, leveling agent in UV/EB-curable elec, coatings and inks, pressure-sensitive and laminating adhesives, etch-resist, inks for printed circuit boards, neg. photoresists and OPVs for paper and films Features UV/EB curable metal substrates show exc. adhesion, good scuff resist., high gloss... 

A distinct characteristic of photoinitiated cationic polymerisation is its lack of sensitivity towards atmospheric oxygen which does not scavenge cationic species, as well as its living character due to the fact that the propagating polymer cations are not reacting among themselves. In contrast to radical-initiated polymerisation, the chain reaction will thus continue to proceed in the dark after the UV-exposure, a feature which was used to assemble nontransparent materials by UV-curable laminating adhesives [56]. 

UV-curable adhesives. Fig. 8 shows a schematic representation of the experimental setup. By running the UV-line at a speed of 1 m/s, the second foil will be laminated on top of the irradiated foil only 0.5 s (50 cm) after the UV-exposure, so that most of the VE polymerisation will occur in the dark. UV-curable epoxy resins were also successfully used as adhesives to laminate opaque films by such an ultrafast dark-cure mechanism [56,62]. 

When UV-curable resins are used as laminated adhesives to protect three-dimensional objects having complex shapes, it may happen that some remote areas wiU not be accessible to UV-radiation and therefore remain uncured. To address the issue of such shadowed areas, dual-cure systems combining UV-irradiation and thermal treatment have been developed [71]. They contain two types of reactive functions a UV-curable functional group (usually an acrylate double bond)... 

---