Wyniki wyszukiwania - BazTech

1

Influence of unsaturated benzophenone photoinitiators on acrylic PSA performance

Czech Z., Kowalska J., Rogańska J., Antosik A. K.

Elastomery

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2014

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T. 18, nr 2

17--22

EN

In the following study, the synthesis and characterization of UV-crosslinkable solvent-based acrylic pressure-sensitive adhesives (PSA) were presented. Different amounts of unsaturated copolymerizable photo-initiators based on substituted benzophenone were incorporated into acrylic PSAs synthesized in ethyl acetate and based on butyl acrylate and acrylic acid. Molecular weight measurements referring to Mw -weight average molecular weight, Mn - number average molecular weight and Pd - polydispersity of the synthesized adhesives were conducted. The synthesized photoreactive acrylic PSA were coated on polyester carrier, dried at 110°C in drying canal and subsequently crosslinked under UV lamp emited UV radiation in the area between 200 and 400 nm. The resulted photoreactive UV-crosslinkable acrylic PSA are characterized by good tack, good adhesion and excellent cohesion.

PL

W niniejszej publikacji omówiono syntezę oraz właściwości sieciowanych promieniowaniem UV rozpuszczalnikowych poliakrylanowych klejów samoprzylepnych. Poliakrylanowe kleje samoprzylepne otrzymano w wyniku rodnikowej polimeryzacji w octanie etylu mieszaniny monomerów: akrylanu butylu, kwasu akrylowego oraz nienasyconych fotoinicjatorów na bazie benzofenonu. Zsyntetyzowane kleje różniły się ciężarem cząsteczkowym oraz polidyspersyjnością. Otrzymane fotoreaktywne kleje rozpuszczalnikowe powlekano na folii poliestrowej, suszono w kanale suszącym 10 min w temperaturze 110°C, a następnie sieciowano pod lampą UV emitującą promieniowanie w obszarze 200-400 nm. Usieciowane poliakrylanowe kleje samoprzylepne charakteryzowały się dobrą kleistością, dobrą adhezją oraz bardzo wysoką kohezją.

2

Influence of the unsaturated photoinitiators kind on the properties of uv-crosslinkable acrylic pressure-sensitive adhesives

Czech Z., Kowalczyk A., Górka K., Głuch U., Shao L., Świderska J.

Polish Journal of Chemical Technology

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2012

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Vol. 14, nr 3

83-87

EN

UV-crossinkable pressure-sensitive adhesives (PSA) materials are called, in the adhesives trade photoreactive self-adhesive. UV-crosslinkable PSAs are designed after the UV-initiated crosslinking reaction to stick to almost any surface by a simple contact under light pressure. This special class of adhesives does not undergo any physical transformation or chemical reaction during the bonding process. Because of the rheological properties the adhesive must be fi nely tuned for the application, combining a carefully chosen polymer architecture and monomer composition with the proper addition of small additives called photoinitiators. The best way is using the unsaturated copolymerizable photoinitiators and their direct incorporation into polymer chain during the polymerization process. Progress in the coating technology and the development of novel photoreactive acrylic adhesives will open the door to new applications and an extended market penetration of UV-crosslinkable acrylic adhesive raw materials containing unsaturated copolymerizable photoinitiators incorporated into the polymer backbone. Photoreactive UV-crosslinkable acrylic PSA are characterized by good tack, good adhesion, excellent cohesion and very low shrinkage.

3

Ultraviolet and thermally initiated crosslinking of solvent-free acrylic PSA

Czech Z., Malec A.

Polish Journal of Chemical Technology

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2006

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Vol. 8, nr 2

5-8

EN

Ultraviolet technology is well established in the word industry and allows the production of a wide range of various UV curable solvent-free pressure-sensitive adhesives (PSAs) with interesting performances. Industrial applications of UV curable solvent-free acrylic PSAs (UV-PSAs) have grown tremendously over the last 15 years. The balance between adhesive and cohesive performances within the crosslinked layers is critical for the performance of the UV-PSAs. The combination of ultraviolet and thermal crosslinking enables the manufacturing of self-adhesive products based on solvent-free acrylic PSA films having different adhesion/cohesion properties and offers novel opportunities to develop innovative articles with new unique features. UV radiation is used to induce crosslinking of the acrylic PSA formulations containing photoreactive polymers, prepolymers, diluents and conventional or unsaturated novel photoinitiators. This report describes a new generation of UV curable acrylic PSA containing the dual crosslinking system that uses UV and thermally initiated crosslinking. These solvent-free acrylic PSA are characterized by excellent adhesiveness and cohesiveness.