Methylene bis phenyl isocyanate

Segmented poly(ether urethanes) were synthesized from polypropylene glycol (PPG) and 4,4 methylene-bis(phenyl-isocyanate) (MDI), using l,l -bis(B-aminoethyl)ferrocene (1) and 1,1 -bis(B-hydroxyethyl)-ferrocene (2) as chain extenders. 

Fig. 2. Reactivity of aromatic diisocyanates 0.02 M with 2-ethyihexanol 0.4 M and diethylene glycol adipate polyester in benzene at 28°C. (A) l-Chloro-2,4-phenylene diisocyanate. (B) m-Phenylene diisocyanate. (C) p-Phenylene diisocyanate. (D) 4,4 -Methylene bis(phenyl isocyanate). (E) 2,4-Tolylene diisocyanate. (F) Tolylene diisocyanate (60%, 2,4-isomer, 40% 2,6-isomer). (G) 2,6-Tolylene diisocyanate. (H) 3,3 -Dimethyl-4,4 -biphenylene diisocyanate (0.002 M) in 0.04 M 2-ethylhexanol. (I) 4,4 -Methylene bis(2-methylphenyl isocyanate). (J) 3,3 -Dimethoxy-4,4 -biphenylene diisocyanate. (K) 2,2,5,5 -Tetramethyl-4,4 -biphenylene diisocyanate. (L) 80% 2,4- and 20% 2,6-isomer of tolylene diisocyanate with diethylene glycol adipate polyester (hydroxyl No. 57, acid No. 1.6, and average molecular weight 1900). Reprinted from M. E. Bailey, V. Kirss, and R. G. Spaunburgh, Ind. Eng. Chem. 48, 794 (1956). (Copyright 1956 by the American Chemical Society. Reprinted by permission of the copyright owner.)...

First-generation solventless polyurethane adhesives are one-component isocyanate terminated prepolymers formed by the reaction of MDI (4,4 methylene bis (phenyl isocyanate)), or other isocyanates with polyether and/ or polyester polyols. One-component 100% solids adhesives rely on moisture from the air or substrates or from induced moisture misting during the converting process, to cure the adhesive via an isocyanate/water reaction and subsequent polyurea-polyurethane polymer formation. Typically the high viscosity of the adhesive is such as to require adhesive delivery equipment and application rollers heated from 65-80 °C for use. They have a high level... 

The results of pyrolysis for poly[(1,6-hexyl-1,2-ethyl carbonate)diol 4,4 -methylene-bis(phenyl isocyanate)]-co-[1,4-butandiol 4,4 -methylenebis(phenyl isocyanate)] show that the pyrolysis process for this copolymer is in many respects similar to that of other polycarbonates. The possible formation of 4,4 -methylenebisbenzeneamine, which has the base peak at 198 a.u. corresponding to the molecular ion, and which is likely to be formed in the pyrolysate, is not detected in the pyrogram. This compound does not elute in the experimental conditions used for the pyrolysate separation, and its formation cannot be verified. 

Journal of Microencapsulation 18, No.6, Nov./Dec. 2001, p.801-9 MORPHOLOGY AND STRUCTURE OF MICROCAPSULES PREPARED BY INTERFACIAL POLYCONDENSATION OF METHYLENE BIS(PHENYL ISOCYANATE) WITH HEXAMETHYLENE DIAMINE Jabbari E... 

Polyurethane-urea microcapsules were prepared by the interfacial polycondensation of methylene bis(phenyl isocyanate), hexamethylene diamine and anionic sodium hgnin sulphonate, as the emulsifying agent, and 2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide, as a herbicide. The morphology amd microstractuie of these microcapsules were investigated by TEM and scanning electron microscopy and the effect of caldrun chloride on the stabihty of the microcapsule stractuie examined. 22 refs. 

In a series of papers cured resins based upon enriched 4,4 -methylene-bis(phenyl isocyanate) (MDI) have been examined by utilising C and N... 

The earliest commercial urethane coatings were based on polyester-polyisocyanate systems that exhibited excellent abrasion resistance, toughness, and a wide range of mechanical strength properties. Most urethane coating systems in this country were first based on tolylene diisocyanate (TDI), while in Europe many systems based on 4,4 -methylene bis(phenyl isocyanate) (MDI) were developed. In order to avoid the use of free TDI, adducts of polyols such as trimethyolpropane or 1,2,6-hexanetriol with TDI were introduced, particularly for two-component coatings (1., 2). 

Isocyanate Components. Aromatic Di- and Polyisocyanates. The most important monomeric aromatic diisocyanates used for coatings are tolylene diisocyanate (TDI) and 4,4 -methylene bis(phenyl isocyanates) (MDI). Tolylene diisocyanate, a colorless liquid (bp 120 °C at 10 mmHg), is generally used in 80/20 blends of the 2,4-and 2,6-lsomers. Pure 2,4-TDI isomer has also been employed for coatings. 

The reaction is usually carried out at high temperatures (of about 200°C) in a polar solvent, such as tetramethylene sulfone, and the polyamide formation can be accelerated by the addition of l-phenyl-3-methyl-2-phospholene 1-oxide as catalyst. However, in the case of a two-step process, the reaction time of the first step must be carefully controlled, since the catalyst can also play a role in the formation of carbodiimides from two terminal isocyanate groups [36], These carbodiimides can then further react and lead to crosslinking [36], In most cases [34-39], the polymers are prepared with 4,4 -methylene bis(phenyl-isocyanate) (MDI), using adipic acid, isophtahc acid, azelaic acid, or a mixture of two of them (in order to accelerate the solubilization of the polyamide phase in the solvent) and a polyether based on tetramethylene oxide, ethylene oxide, or a mixture of propylene oxide and ethylene oxide. 

ETDA benzophenone-3,3, 4,4 -tetracaiboxylic dianhydride TDI, toluene diisocyanate MDI, 4,4 -methylene bis(phenyl isocyanate) AAPTMI, 5(6Famino-l-(4 -aininophenyl)-l,3-trimethylindane 6FDA, 5,5-[2,2,2-tri-fluoro-l-(trifluoromethyl)-ethylidene]-bis-l,3-isobenzofiiianedione 6FipDA, hexafluoro-2,2-bis(4-aiiiinophenyl)-propane PMDA, pyromellitic dianhydride ODA, 4,4 -oxydianiline. 

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