Methylethylketone peroxide

Lupersol DDM. A proprietary catalyst of Wallace Tiernan, Inc, Buffalo, NY, contg 60% methylethylketone peroxide in dibutyl phthalate, used as the hardener in Laminae (qv) Refs 1) OrdTechTerm (June 1962), 183-R 2) Anon, EngDesHdbk, Military Pyrotechnics Series, Part Three — Properties of Materials Used in Pyrotechnic Compositions , AMCP 706-187 (Oct 1963), 183-4... 

For example, dimethylaniUne has no accelerating effect on methylethylketone peroxide, but it can have a significant influence on the system MEK peroxide/cobalt accelerator, whose effect is frequently made use of for processing purposes. 

Curing system was the conventional MEKP (methylethylketone peroxide) initiator and cobalt naphthenate accelerator. 

The thermal-catalytic method involves the nse of chemical initiators and heat. Commonly used initiators include benzoyl peroxide (CFRP), azobis-isobutyronitrile, a-tert- mXy -azoisobutyronitrile, tert-butylperbenzoate, and methylethylketone peroxide (MEKP) [11]. 

Structure-property relationships in crosslinked polyester-clay nanocomposites, prepared by dispersing methyl tallow bis-2-hydroxyethyl quaternary ammonium chloride-modified montmorillonite in prepromoted polyester resin and subsequently crosslinking using the methylethylketone peroxide initiator at room temperature and at several clay concentrations, were analyzed by X-ray diffraction combined with Transmission Electron Microscopy (TEM), thermal (TGA) and dynamic mechanical analyses as well as by the determination of mechanical and optical properties [158]. In all cases the formation of a nanocomposite and the morphology of a dispersion of intercalated/exfoHated aggregates of clay sheets in the resin matrix were confirmed (Fig. 17). hi the absence of reflection irrespective of clay concentration in the scattering curves for all the polyester-clay nanocomposites was ascertained. 

The study of the crosshnking of dimethacrylate-based VERs using scanning/isothermal DSC and DMTA describes the correlation between the reaction kinetics, as well as the relaxational behavior, cure temperature and peroxide and cobalt catalyst concentration [195]. An increase in the methylethylketone peroxide concentration increased the polymerization rate and reduced the gel time. The use of cobalt octoate as the promoter also reduced the gel time but retarded the reaction rate, except at very low concentrations. This could be explained by the dual role of the cobalt species as a catalyst of the formation of radicals from MEKP (Scheme 30) ... 

The curing process of VER (Scheme 33) using methylethylketone peroxide (MEKP) as the initiator and cobalt hexanoate (CoHx) as the promoter was studied by means of thermal scanning rheometry (TSR) and DMTA under isothermal conditions. Some kinetic parameters, i.e. gel time, apparent activation energy ( a) for this process were calculated [201]. The value of Ea obtained from the TSR measurements is independent of both the initiator and promoter concentration. 

In a paper by Cao and Lee [85], the use of a commercial carboxylated poly(vinyl acetate) as a low-profile additive for a cold-curing UPR system with a styrene monomer was described. A dual-initiator system consisting of methylethylketone peroxide and ferf-butylperoxybenzoate with a cobalt promoter and benzoquinone inhibitor was applied. A potential increase in residual styrene content was taken into account in addition to the low-profile characteristics. Morphology of the UPR samples cured in the temperature range of 35-100 °C was studied. 

The cross-linking reaction is initiated by peroxide catalyst at 50-150°C, or by a redox system at room temperature. Initiators include benzoyl peroxide and t-butyl perbenzoate for high-temperature curing, or methylethylketone peroxide and cyclohexanone peroxide, with cobalt octoate or naphthenate as... 

Butonone Peroxide Dimer, MethylethyI ketone Peroxide, (C4H8Oz)2 mw 176.21, O 36.20% col thick oil, haying a pleasant odor stable at RT but explodes when heated above 100°, d 1.042 was obtd when butanone was treated with H202 in the presence of H2S04 sol in ale, eth or benz insol in w. The compd is completely reduced to methylethylketone by the action of nascent H in the cold it explodes violently when placed in contact with coned H2S04. Butanone peroxide is sold under the trade name "Lupersol DDM , by Wallace Tiernen, Inc, Buffalo, NY(Ref 3) Refs l)Beil 1, 6.68 2)J.Pastureau, CR 144,... 

A binder for copper clad laminates contains the prepolymer from BPA/DC and A -(3,5-dimethyl-4-vinylphenyl)maleimide in methylethylketone, an epoxynovolak resin, Zn acetate and tert.butyl peroxide [100], In a similar composition, a prepolymer obtained from epoxide resin, BMI and bis(4-aminophenyl)methane was mixed with BPA/DC, Zn acetate and tert.butyl peroxide in solution [101]. 

Epoxynovolak resin and BPA/DC-BMI prepolymer, tert.butyl peroxide and Zn acetate [106, 107] or 2-phenylimidazole and other catalysts [108] were filled with wollastonite. Carbon-fiber reinforced composites were obtained using a binder, which consisted of BPA/DC, BMI, an epoxynovolak, 2-ethyl-4-methylimidazole and an organic solvent [109]. A BPA/DC-BMI prepolymer in methylethylketone was mixed with middle-molecular-weight epoxide resin (Epikote 1001), 2-ethyl-4-methyl-imidazole, Zn acetate and triethylenediamine thermal shock resistant GRP was thus obtained [110]. 

Some dicyanate-containing compositions, which contain rubbers as flexibilizing components, were described in the preceding chapters. There were also patent applications made, where dicyanates were claimed as additives in typical rubber mixtures. In such mixtures, butadiene-acrylonitrile rubber is used. The main components of such binders are nitrile rubber, BPA/DC and methylethylketone. They contain, moreover, Zn octoate and Fe203 [144] or ZnO and sulfur [145]. Isoprene-acryloni-trile rubber, BPA/DC prepolymer, Zn octoate, DABCO and benzoyl peroxide were dissolved in a methylethylketone-dimethylformamide mixture. Glass fiber was impregnated with the obtained solution [146]. 

The most important cold curing agent is MEKP, a product made from methylethylketone and hydrogen peroxide. As the pure product is very dangerous, the... 

The kinetics of ozone reactions with ketones is also determined using gas chromatographic analyses. The relative rate constants shown in Table 6, column 4 demonstrate that only acetone and methylketone possess lower reactivity than the standard. It is seen that the rate constants, calculated from the relative values and the value of the standard constant correspond to those found by the bubbling method. The main products of ozone interaction with methylethylketone are 2-hydroxymethylethylketone, diacetyl, peroxides - alkyl and hydro, acetaldehyde and AcAc. 

New additives for UPR processing were developed. Peroxide initiators were synthesized by Gawdzik et al. from an aqueous solution of hydrogen peroxide, methylethylketone and ethylene glycol or 1,4-butanediol [166]. 

---