Urethane acrylate, addition

Sancure 853 urethane, wood paints Beckocoat VPU 4204/31LG urethane, wood primers Wilcaband W-240 urethane, wood topcoats Hauthane HD-3016 Hauthane HD-4675 urethane-acrylic additive, architectural coatings brashing varnishes NeoPac R-9000... 

Various finishes can be achieved — gloss, satin (or egg-shell) or matt. This is accomplished by the addition of particles of size 1-5 pm of, for example, silica, china clay or the white pigment, TiCK The degree of mattness depends on various factors, such as particle size, surface treatment of the particles, rate of film formation, and the polymer composition, e.g., urethane/acrylate compared with epoxy/acrylate. The former requires smaller particles larger particles cannot be used as they create a rough surface. 

As mentioned earlier, UV-curable resin formulations are very attractive for fiber coating because of the rapid cross-linking rates that are achievable. Most commonly, epoxy- or urethane-acrylate resins are employed (18-22), and viscosity and cross-link density are controlled through the addition of reactive diluents. With these systems work has focused on producing low modulus, low T properties (20-22) through the incorporation of appropriate chemical constituents to enhance higher chain flexibility, for example, ether linkages. 

Acrylic adhesives cure by addition polymerization reactions. These chain reactions are initiated by the formation of free radicals that result in the adhesive curing by way of a very rapid polymer chain growth. This cure chemistry is significantly more rapid than a typical cure curve (i.e., condensation type) found in epoxy and urethane adhesives. A comparison of the cure profile of condensation (epoxy and urethane) versus addition... 

Chem. Descrip. Water-borne urethane-acrylic copolymer, aliphatic Uses Urethane-acrylic as additive to other prods, to reduce cost, add toughness and antiskid props, for use in architectural coatings such as... 

Wang and Cheng reported preparation of ultraviolet light-curable resin for coating optical fibers. It consists of polydimethylsiloxane epoxy acrylate and polyethylene glycol urethane acrylate. To this were added in different proportions trimethylolpropane triacrylate to modify the properties of blends. After addition of a photoinitiator the choice formulation photo cured in 5 seconds. 

Zahouily, K., Boukhaftane, C. and Decker, C., Surface modifications of UV-cured urethane-acrylate coatings by addition of fluoro or silicone acrylic monomers (pp. 803-808), Proc. RadTech Europe, 1999. 

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

In the case of the polyether urethane acrylates, the material properties were varied by the length of the poly(propylene oxide) chain. Increasing the chain length decreases crosslink density and content of polar urethane groups and increases the volume fraction of low T, low refractive index polyether. As a result T, refractive index and E-modulus decrease. The addition of a small amount of reactive diluent (g20%) brings the viscosity and the curing rate to the desired level. 

In addition to results obtained with these model compounds, we will describe a restricted number of studies on mixtures of epoxy acrylates or urethane acrylates with reactive diluents. 

The preparation of a urethane acrylate according to the inside-out technology starts with the polymeric diol. The reactor is charged with the diisocyanate, catalyst, and stabilizer. Now the diol is added slowly and a strong exothermic reaction starts. The rate of isocyanate addition is generally used to control the reaction exotherm in such a way that the temperature does not exceed 45°C. The control of this exotherm is especially important when IPDI is used as diisocyanate. For a higher se-... 

An illustration of the effect of blending an iso-polyester resin with a urethane acrylic is shown in Figure 6.2. The beneficial effect of adding a flexible resin on the impact strength is clear. The effects of the additive on tensile properties are shown in Figure 4.1. 

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]. 

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). 

Synthesis of Urethane Modified Acrylics and Acrylic Modified Urethanes. 1) Synthesis of PBH. Into a reaction kettle equipped with a nitrogen inlet, stirrer, reflux condenser, and an addition funnel charged 500g of xylene. The xylene was heated to reflux and a mixture of 375g butyImethacrylate (BMA), 125g of 2-... 

PVC, polyamides, unsaturated crosslinked polyesters, ABS, and wood . Di- and tri-benzotriazole photostabilizers, such as (874) and (875) are synthesized from 2-nitro-benzenediazonium salts and an excess of 1,3-dihydroxybenzene or 1,3,5-trihydroxybenzene <85Mi 40i-0l>. The dibenzotriazole derivatives (874b and 875b) can be used as polymerizable acrylic UV absorbers <84PB237>. A few or/Ao-urethane and -trimethylsilane substituted 2-phenylbenzotriazoles (876 and 877) show similar photostabilization activity . Weather resistance of low-density polyethylene is improved by the addition of a benzotriazole-type photostabilizer <90M140i-04>. 

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