Dimethylol propionic acid

Dimethyl ester-diol polyesterifications, 84 Dimethyl formamide (DMF), 79, 295 Dimethyl isophthalate (DMI), 106 Dimethylol propionic acid (DMPA), 238 Dimethyl sulfoxide (DMSO), 83, 185,... 

A wide variety of monomers, such as (3,5-dibromophenyl)boronic acid, 3,5-bis(trimethylsiloxy)benzoyl chloride, 3,5-diacetoxybenzoic acid, and 2,2-dimethylol propionic acid have been used for the synthesis of hyperbranched polymers. A selection of these polymers are described in Sect. 3. The majority of the polymers are synthesized via step-wise polymerizations where A B monomers are bulk-polymerized in the presence of a suitable catalyst, typically an acid or a transesterification reagent. To accomphsh a satisfactory conversion, the low molecular weight condensation product formed during the reaction has to be removed. This is most often achieved by a flow of argon or by reducing the pressure in the reaction flask. The resulting polymer is usually used without any purification or, in some cases, after precipitation of the dissolved reaction mixture into a non-solvent. 

The first part of this review deals with the synthesis and characterization of dendritic aliphatic polyesters based on 2,2-bis(dimethylol)propionic acid (bis-MPA) and 1,1,1 -tris(hydroxyphenyl)ethane (THPE), as core molecule. The convergent growth approach described earlier was applied. We also present H NMR self-diffusion studies of dendrimers of first, second, and third generation. 

A versatile way of synthesizing hydroxyfunctional hyperbranched aliphatic polyesters using 2,2-bis(dimethylol)propionic acid together with a polyol core through a pseudo-step-wise procedure has been presented. The polyesters were shown to have a very high degree of branching (-80%), as determined with... 

DMPA. See 0-(2,4-dichlorophenyl)-0-methyl isopropylphosphoramidothioate, dimethylol propionic acid. 

A very interesting dendritic polyester polyol was developed by Perstorp (Sweden), by self-condensation of dimethylolpropionic acid, initiated by a polyol such as pentaerythritol [16]. Of course, the condensation of dimethylol propionic acid with one hydroxyl group generates two hydroxyl groups as shown in reaction 19.12. 

PET/PA-6 with a,a-dimethylol-propionic acid Reimschussel Dege, 1969... 

Waterborne polyurethane resins are produced from maleinised monoglyceride (MMG) of sunflower oil, hydroxy-terminated polybutadiene, toluene diisocyanate and ethylene diamine. The carboxylic acid groups of MMG are neutralised by triethyl amine, making the resin water dispersible. The monoalkylated castor oil (MCO) or dehydrated castor oil (DCO) is treated with a polyether glycol at 120°C, followed by the addition of IPDI and DBTDL. To obtain a series of aqueous polyurethanes, butane diol and dimethylol propionic acids (DMPA) are added and the mixture heated to 70°C for two hours to produce a NCO-terminated pre-polymer which forms salt with triethylamine, giving a water-soluble polymer. The reaction mixture is dispersed in water and a chain extender, ethylene diamine, is added. Two aqueous polyurethanes, MCPU and DCPU, are finally obtained from MCO and DCO, respectively. 

Using a mixture of castor oil and hydroxyether of bisphenol-A (HBA) as the polyol and reacting with TDI in the presence of DBTDL catalyst at 35°C, a series of polyurethanes are prepared in an air-circulating oven for 48 h. A series of poly(urethane urea)-vinyl polymer hybrid aqueous dispersions are prepared. Waterborne poly(urethane urea) is synthesised from castor oil and polyoxypropylene polyol M = 1000 g moL ), dimethylol propionic acid and isophorone diisocyanate and then neutralised with tertiary amine. The hybrid aqueous dispersion with high oil content poly(urethane urea) exhibits excellent compressive mechanical strength. Sunflower oil-modified waterborne polyurethane resin may also be prepared. The waterborne resin is synthesised from the monoglyceride of the oU, poly(propylene-ethylene) triol, tartaric acid and toluene diisocyanate, then neutralised with triethyl amine. 

However, after esterification with dimethylol propionic acid, the viscosity of the former resin increased to 7.0 Pa s and that of the second to 3.7 Pa s. ... 

Isobutane Isobutyric acid Isoamyl acetate Isoamyl alcohol tert-Amy alcohol Acetoacetic acid Vinylidene chloride Vinylidene fluoride Ethylene dichloride Dichloroethylene ortho-Xylcne Ethylene oxide Propylene oxide meta-Xylenc Ethylene carbonate Propylene carbonate para-XylQTiQ Caprolactone Ricinoleic acid Bisphenol A Pentaerythritol Dimethylol propionic acid Neopentane Isobutylene... 

Dimethylol propionic acid (DMPA) 4,4 -Methylene-bis-(3-chloro-2,6-... 

Other organic acids and esters include dimethylol propionic acid and the glycidyl ester of a synthetic saturated tertiary carboxylic acid. 

In the first step of the synthesis, a conventional polyether- or polyester-based isocyanate-terminated prepolymer is obtained by condensation polymerization of a diol and a diol containing a carboxyl function, preferably reacting the hydroxyl groups of dimethylol propionic acid with isocyanate groups. In the next step, the carboxyl groups are neutralized with an amine which is subsequently dispersed in water and... 

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