Acrylated urethane oligomer

Liquid photo-sensitive acrylated urethane oligomer... 

The structure of a typical acrylated urethane oligomer is shown below ... 

UV cured resins containing acrylated urethane oligomers are usually abrasion resistant, tough, and flexible. TTiese properties are ideal for coatings on floors, paper, printing plates, and in packaging materials. 

O Table 13.11 shows an example of formulation of the UV-curable coatings, which is composed of isocyanate and acrylated urethane oligomers (Lee and Kim 2006). In addition, O Fig- 13.11 shows chemical structures of light stabilizers. UV-cured film with both... 

Lee BH, Kim HJ (2006) Influence of isocyanate type of acrylated urethane oligomer and of additives on weathering of UV-cured film. Polym Degrad Stabil 91 1025... 

There are two approaches to forming urethane-acrylic hybrids. First, an acrylate terminated urethane oligomer can be used [147]. Alternatively, polyisocyanate and benzoyl peroxide can be combined in one side of the adhesive, and methacrylate monomers and urethane curatives (especially polyols) in the other [148]. 

Reactive prepolymers used as binders are produced by acrylation of oligomers, such as epoxy resins, urethanes, polyesters, silicones, oligo-buta-diene, melamine derivatives, cellulose, and starches. Prepolymers are the principal ingredients of coating formulations and largely determine the basic properties of the coating. Examples of industrially important acrylated prepolymers are in Table 5.9. 

Urethane Oligomer E, parts 2-Ethylhexyl acrylate Hydroxyethyl acrylate 2-Ethoxyethyl acrylate... 

Acrylated urethanes are an Important class of commercial radiation-curable oligomers. Industrial applications of these materials cover a wide range. Including binders for magnetic media, vehicles for inks, and coatings for vinyl floor tiles, optical fibers, and paper. The compositions, and therefore, the properties of the acrylated urethanes are varied in order to meet the performance criteria of the different end uses. Properties of various acrylated urethanes will be discussed as they relate to structure. 

Prepolymers. A broad range of acrylated resins (oligomers) are commercially available. The film-forming properties depend on the oligomer system. One of the most common is the acrylated epoxy system. In acrylated urethanes, an isocyanate-functional prepolymer with a polyol backbone can be reacted with a hydroxy-functional monomer (e.g., hydroxyethyl or hydroxypropyl acrylate). Many different resins can be synthesized by varying the polyol backbone, the isocyanate type, and the hydroxy-functional monomer. Polyester acrylates are another example of commercially important prepolymers. Acrylated acrylics have an acrylic backbone with pendant acrylate functionality. 

Chem. Descrip. Aliphatic urethane diactylate/monomer blend Uses Urethane-acrylic in plastic and wood coatings Features Dilution of urethane oligomer with Photomer 4061 (TPGDA) to facilitate easier handling and applic. tough and abrasion resist. Properties High m.w. 

Baccei (21) discloses polymerizable adhesive and sealant compositions having as an important ingredient urethane-acrylate-capped oligomers based on liquid hydroxyl-terminated polybutadiene or polybutadiene/ acrylonitrile copolymers. Properties associated with impact and thermal improvements are noted as well as the ability to cure adequately through the bondline gap. Model systems are largely triethylene glycol dimethacrylate based. Impressive adhesive performance properties are recorded. (Cf. Paper by Malofsky and Baccei in this... 

PU-based acrylate-terminated polymers have also been introduced for use in UV-cured or electron beam (EB)-cured elastomer coatings. They are usually used in conjunction with di- or trifunctional acrylate resins such as 1,6-hexane diol diacrylate (HDDA) (Fig. 12.8) whose function is to control hardness and flexibility in the final elastomeric lacquer. A series of these special monomers and urethane oligomers is marketed under the trade name Photomer (Harcross Chemicals). 

Products Acrylate monomers, acrylic acrylates, acrylate oligomers, epoxy acrylates, polyester acrylates, urethane acrylates, specialty acrylates, polyols/glycols, additives, photoinitiators/sensitizers... 

Radiation cure coatings are typically solvent-free, high sohds systems based on acrylated epoxy or urethane oligomers and diluent multifunctional acrylate monomers. Since radiation intensity varies significantly with... 

Liquid organic rubbers with reactive functionality can be prepared by several methods. End-functional oligomers are preferred. Chains attached to the network at only one end do not contribute as much strength to the network as those attached at both ends [34], Urethane chemistry is a handy route to such molecules. A hydroxy-terminated oligomer (commonly a polyester or a polyether) can be reacted with excess diisocyanate, and then with a hydroxy methacrylate to form a reactive toughener [35]. The methacrylate ends undergo copolymerization with the rest of the acrylic monomers. The resulting adhesive is especially effective on poIy(vinyl chloride) shown in Scheme 2. 

II. B polyethylene glycol, ethylene oxide, polystyrene, diisocyanates (urethanes), polyvinylchloride, chloroprene, THF, diglycolide, dilac-tide, <5-valerolactone, substituted e-caprolactones, 4-vinyl anisole, styrene, methyl methacrylate, and vinyl acetate. In addition to these species, many copolymers have been prepared from oligomers of PCL. In particular, a variety of polyester-urethanes have been synthesized from hydroxy-terminated PCL, some of which have achieved commercial status (9). Graft copolymers with acrylic acid, acrylonitrile, and styrene have been prepared using PCL as the backbone polymer (60). 

Reactive oligomers such as epoxy resins, isocyanate-terminated compounds, and urethane-acrylates are extremely useful in the adhesive, coating, reaction injection molding (RIM), sealant and... 

Improved heat-resistant UV compositions for optical fiber applications These compositions are nonurethane UV cure compositions that have neither carbamate moieties nor long-chain poly(alkylene oxide) soft segments and exhibit inherently better thermal stability measured by thermogravimetric analysis (TGA) than typical coatings for optical fibers based on urethane acrylate oligomers. 

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