URETHANE DIACRYLATE

NR, styrene-butadiene mbber (SBR), polybutadiene rubber, nitrile mbber, acrylic copolymer, ethylene-vinyl acetate (EVA) copolymer, and A-B-A type block copolymer with conjugated dienes have been used to prepare pressure-sensitive adhesives by EB radiation [116-126]. It is not necessary to heat up the sample to join the elastomeric joints. This has only been possible due to cross-linking procedure by EB irradiation [127]. Polyfunctional acrylates, tackifier resin, and other additives have also been used to improve adhesive properties. Sasaki et al. [128] have studied the EB radiation-curable pressure-sensitive adhesives from dimer acid-based polyester urethane diacrylate with various methacrylate monomers. Acrylamide has been polymerized in the intercalation space of montmorillonite using an EB. The polymerization condition has been studied using a statistical method. The product shows a good water adsorption and retention capacity [129]. 

Photoinitiator concentration 4 equiv.% of BAE with respect to the reactive acrylate group in the fonnulation. Irradiation conditions 45 mW/cm by a high pressure mercury lamp PTMG urethane diacrylate obtained by reacting PTMG-diisocyanate with 2-hydroxyethyl acrylate... 

Oxidation Studies. Oxygen absorption studies of representative acrylate coatings show that these materials can absorb oxygen at elevated temperatures. Figure 1 shows data at 139 l C for an epoxy diacrylate coating, A, and two urethane diacrylates, B and C. All materials undergo some degree of oxidation, but the epoxy diacrylate is the most unstable. 

Dynamic thermal analysis confirm these findings, where the epoxy diacrylate material begins to oxidize at a considerably lower temperature than the urethane diacrylate (Table II). The instability of the epoxy diacrylate is also confirmed by UV spectra of films heated in oxygen to 200 "C on quartz plates (Figure 2). Absorptions at 282 and 278 nm in the initial spectrum are... 

Chem. Descrip. Aliphatic urethane diacrylate oligomer with acrylate monomer (30%) diluent... 

Chem. Descrip. Aliphatic polyester-based urethane diacrylate oligomer Uses Urethane-acrylic for coatings, flexible pkg., screen inks Features Difunctional low vise. exc. conformal props. good weatherability, chem. resist., flexibility, adhesion, heat resist., abrasion resist., impact str., water resist. low shrinkage Properties APHA 55 clear liq. dens. 9.213 Ib/gal vise. 660 cps (60 C) ref. index 1.4882 tens. str. 945 psi 1% mod. 3557 psi elong. 53% CN996 [Sartomer]... 

Chem. Descrip. Aliphatic urethane diacrylate Uses Urethane-acrylic for inks and coatings for plastic and metal, laminating adhesives flexibilizer for epoxy and urethane formulations Features Cures to a soft flexible film... 

Chem. Descrip. 2,2-Dimethoxy-2-phenylacetophenone CAS 2465042-8 EINECS/ELINCS 246-386-6 Uses Photoinitiator tor UV-curable coatings, adhesives, inks, and printing plates, for unsat. polyester and acrylate systems Properties Wh. cryst. solid sol. > 50% w/v in methyl methacrylate, styrene, 31% in 2-hydroxyethylacrylate, 30% in 1,6-hexanediol diacrylate, 26% in aromatic urethane diacrylate, 23% in propylene glycol diacrylate, 20% in DOP m.p. 63-68 C 99.5% min. assay Use Level 1-4%... 

Properties Yel. cryst. powd. sol. 43% w/v in methyl methacrylate, 25% in 1,6-hexanediol diacrylate, 24% in aromatic urethane diacrylate, 16% in propylene glycol diacrylate 98% min. assay Use Level 0.25-1.5%... 

Chem. Descrip. Urethane diacrylate oligomer Uses Flexibilizer, toughener for coatings, inks, UV/EB adhesives (pressure-sensitive tapes) applied to flexible substrates Features Imparts high flexibility and elasticity, adhesive peel sir., toughness high elong. 120%... 

Chem. Descrip. Aliphatic urethane diacrylate oligomer Uses Film-former for UV/EB-curable coatings and inks for paper/paper-board, plastic, and metal substrates base resin for screen printing inks Features Mod. cure response exc. solv. resist., surface hardness, flexibility, toughness... 

Trade Names Containing Hardener OZ Urethane diacrylate... 

Piolofomr BL18 Piolofonn BN 18 Piolofonn BS18 Urethane diacrylate film-former, metal finishes E-Tec 520 E-Tec 521 E-Tec 522 film-former, metal paints Piolofonn BR18 film-former, metal primers Ecco Rez U-24... 

Acrysol WS-50 CAB-551-0.2 Photomer 6010 Urethane diacrylate film-former, plastic lacquers CAB-500-5... 

Urethane diacrylate + poly(L-lactic acid) Dioxane Diphenyl-(2,4,6-methyl- -25 Preparation of macroporous [172]... 

Urethane diacrylate (aliphatic) Urethane diacrylate (aromatic) Urethane dimethacrylate (UEDMA) Urethane methacrylate Urushiol Usnic acid (ph)... 

DPC has in recent years been applied to studies on a range of photopolymers including DF 2000 photopolymer [5], cinnamoylphenyl methacrylate-glycidyl methacrylate copolymer [6], multiethylene glycol dimethacrylate [7], Ebecryl 270 (aliphatic urethane diacrylate) 1,6-hexanediol diacrylate (Darocur 1173 2-hydroxy-2-methyl-phenylpropan-l-one) [8], epoxy acrylates [9], epoxy vinyl ether formulations [10], polyacrylates, maleimides, and vinyl ethers [11], hydroxylated poly(imides) [12], and polystyrene-poly(n-butylacrylate) copolymers [13]. 

Levy and Massey studied the effect of composition of mixtures on the mechanical properties of the cured polymers Their mixtures contained a urethane diacrylate, 2-ethoxy-ethoxy ethyl acrylate (EEEA) and/or N-vinyl pyrrolidone (NVP). The EEEA was found to react not only with radicals but also with the photoinitiator (DMPA). It also formed a significant amount of homopolymer, thereby reducing the modulus, tensile strength and elongation at break. These effects were ascribed to the low rate of polymerization of EEEA as compared with the diacrylate. 

Tetraoctylammonium nitrate (TOAN) triooctyl phosphonate (TOP) aliphatic urethane diacrylate Ebecryl 270 and hexanediol diacrylate (HDDA) 2-2 -dimethoxyl phenylace-tophenone (Irgacure 651) -62.6 2.3 X 10- 6x 10- 1 X 10- cr = -2.o 116... 

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