[en] Radiation curable composition suitable for use as an adhesive for bonding glass, especially for the production of clear glass laminates, and comprising a urethane acrylate component in an αβ-ethylenically unsaturated diluent which comprises (i) acrylic acid, (ii) a monoester of acrylic acid and a C₁₆ alkanol or substituted derivative thereof said monoester being present in an amount of up to 400% by weight of component (i), and optionally (iii) up to 40% by weight of a multiacrylate

[en] A solvent-free composition based on epoxyacrylate oligomer dissolved in the monomeric ester of acrylic or methacrylic acid, in a mixture with acrylic acid is curable by radiation and chemical polymerization, by irradiation with accelerated electrons or gamma radiation at a dose of 40 to 150 k.kg^-1. Th polymerization rate depends on reaction conditions, especially o the initiation system, flow rate, composition of the material. I can be affected by the presence of metals of variable valency. The highest acceleration effect was found for the 2,2'-dipyridyl complex of cobalt or manganese octoate or the 2,2'-dipyridyl complex of tin, chromium, cobalt or manganese chloride. Addition in an amount of 0.01 to 3.00 wt.% of metal ion related to the amount of the oligomer, reduces the radiation dose 3 to 4 times. (B.S.)

[en] With the integration and development of materials engineering, applied mechanics, automatic control and bionics, light cured composite has become one of the most favourite research topics in the field of materials and engineering at home and abroad. In the UV curing system, the prepolymer and the reactive diluent form the backbone of the cured material together. And they account for more than 90% of the total mass. The basic properties of the cured product are mainly determined by the prepolymer. A low viscosity epoxy acrylate photosensitive prepolymer with a viscosity of 6800 mPa • s (25 °C ) was obtained by esterification of 5 hours with bisphenol A epoxy resin with high epoxy value and low viscosity. (paper)

No abstract available

[en] Well-defined graft copolymers were synthesized through the combination of two highly controlled polymerizations, ATRP (Atom Transfer Radical Polymerization) and ROMP (Ring-Opening Metathesis Polymerization). Synthesis of α-cyclobutenyl polystyrene-b-poly(tert-butyl acrylate) macromonomers was first performed by ATRP from an original initiator. ROMP of these macromonomers using Grubb's generation II catalyst ((IMesH₂)(Cy₃P)RuCl₂(CHPh)) has allowed to synthesize well-defined graft copolymers with a polybutadiene backbone and polystyrene-b-poly(tert-butylacrylate) grafts. α-Cyclobutenyl polystyrene-b-poly(acrylic acid) macromonomers were prepared by acidolysis. An amphiphilic water-soluble α-cyclobutenyl polystyrene-b-poly(acrylic acid) macromonomer has been successfully employed as stabilizer in emulsion polymerization of styrene

[en] The preparation is described of highly cross-linked material by radiation polymerization of reactive solvent-free composition containing 50 to 55 parts of the adduct of epoxy resin of a mean molecular weight of 340 to 450 g.mol^-1 with acrylic or methacrylic acid in a molar ratio of 1:1.4 to 1:1.6; 25 to 30 parts of C₂-C₈ esters of acrylic or methacrylic acid; and 20 t 25 parts of acrylic or methacrylic acid. Radiation polymerizatio is brought about by the action of accelerated electron flux or b gamma radiation at a dose of 80 to 150 kJ.kg^-1. The viscosity of the uncured composition is maximally 1,000 mPa.s/25 degC. The material shows sufficient storage life at room temperature, good wettability for coated surfaces, outstanding flow and low toxicity. The material can be used for producing protective coatings, laminates and castings showing high chemical resistanc and adhesion to all common materials. (B.S.)

[en] Acrylated epoxidised palm olein (AEPO) was synthesised from epoxidised palm olein (EPOo), acrylic acid, hydroquinone and AMC-2® catalyst. Optimisation of the synthesis in terms of the reaction parameters was performed using so-called response surface methodology (RSM). The reaction parameters selected as independent variables were percentage of catalyst; molar ratio between EPOo and acrylic acid; reaction temperature and reaction time. The percentage conversion of epoxy ring to acrylate group was designated as the dependent response. The central composite rotatable design (CCRD) at five coded levels with four factors was used. The quadratic model was used to analyse the experimental data obtained. The quadratic model was significant at a 95 % confidence level with Prob>F of less than 0.0001; the regression coefficient value, R"2 was 0.9561 and lack-of-fit of 0.0646 as obtained by using analysis of variance (ANOVA). A percentage of AMC-2® catalyst of 1.0 %; molar ratio between EPOo and acrylic acid of 1.0:1.2, reaction temperature of 120 degree Celsius, and reaction time of 135 min were established as the optimum parameters in order to convert EPOo to AEPO at mild reaction conditions. The reaction temperature and the time for the acrylation reaction were substantially reduced to 75 % with the incorporation of AMC-2® catalyst compared to the acrylation reaction in the absence of cat lyst. The results also proved that RSM can be employed efficiently for the optimisation of the synthesis of AEPO catalysed by AMC-2® , as the percentage of conversion AEPO obtained with the optimum conditions was 99.26 % ad quate according to the predicted value by the software. The optimum reaction parameter can be used to scale up the acryl tion reaction of EPOo to AEPO (author)

[en] Radiation curable compounds are disclosed which are derived from the reaction of a siloxy-containing carbinol, a polyisocyanate and polyfunctional compound having hydroxy and acrylic functional groups. The compounds have high cure rates, are compatible with other components of radiation curable, film forming compositions and impart good slip and other properties to cured film coatings. (author)

[en] Ultraviolet (UV) cured adhesives have attracted wide attention and investigation in the fields of health care and electronic components due to their quick curing rate, low energy consumption and solvent pollution. At present, the adhesive systems bearing epoxy acrylate components have prevailed in the field of electronic industry packaging. These systems show some advantages such as low cost, high reliability, excellent mechanical traits and fine solvent resistance. However, the affecting factors of the noumenal esterification reaction to synthesize epoxy acrylate prepolymers have hardly been reported. In order to clarify the affecting factors, in this work, the key pre-polymer components in application of UV cured adhesives were designed and further prepared based on noumenal esterification between epoxy resin and acrylic acid. Three kinds of varied epoxy resins were employed to prepare desired epoxy acrylate pre-polymers. Impacts of reaction temperature, epoxy resin type, catalyst content, catalyst class and raw material feed ratio on noumenal esterification reaction were deeply studied. Some valuable conclusions were achieved. This work might open the door to the large-scale synthesis of promising epoxy acrylate pre-polymers to construct high-performance UV curing adhesives by regulating noumenal esterification. (paper)

[en] The invention that is discussed relates to a unique radiation curable coating formulation used in the manufacture of window films. The coating composition is a mixture of radiation polymerizable monomers. The mixture includes a traicrylate or a tetraacrylate acrylic acid. The thickness of the coating after polymerization ranges between about 1 and about 2.5 microns. The coating can be applied to metal substrates and is used to achieve a superior abrasion resistant coating having optimum infrared absorption, while using high infrared absorption components in the coating mixture. Typically, the coating is applied to metal, for example, to aluminum substrates used in the fabrication of insulating window film or window structures. A process for applying the coating to such substrates is also disclosed