Neo-pentyl glycol

The hydroformylation reaction, also known as the oxo reaction, is used extensively in commercial processes for the preparation of aldehydes by the reaction of one mole of an olefin with one mole each of hydrogen and carbon monoxide. The most extensive use of the reaction is in the preparation of normal- and iso-butyraldehyde from propylene. The ratio of the amount of the normal aldehyde product to the amount of the iso aldehyde product typically is referred to as the normal to iso (N I) or the normal to branched (N B) ratio. In the case of propylene, the normal- and iso-butyraldehydes obtained from propylene are in turn converted into many commercially-valuable chemical products such as n-butanol, 2-ethyl-hexanol, trimethylol propane, polyvinylbutyral, n-butyric acid, iso-butanol, neo-pentyl glycol,... 

Impact resistance of carbon-fiber composites or GRP with the three-component polymer matrix can be improved by the incorporation of a terephthalic acid/neo-pentyl glycol polyester [117], The polyester was carboxyl terminated by the addition of trimellitic anhydride to the terminal hydroxyls [118],... 

Branched saturated polyester from adipic acid, phthalic anhydride, neopentyl glycol and trimethyl olpropane was mixed with BPA/DC solution in 2-methoxyethanol/ xylene and diluted with ethyl acetoacetate. A thermohardening coating with high hardness and good adhesion on steel was obtained [136]. A similar coating composition consists of BPA/DC and a polyester from adipic and isophthalic acid, trimellitic anhydride, neo pentyl glycol and trimethylolpropane [137, 138]. 

Three main components for the final polymer layer are shown in Figure 10-2. They are a di-ol (here neo-pentyl-glycol, NPG) and two di-acids (terephthalic acid, TPA and isophthalic acid, IP A). Together they are to form a linear polyester (that will later be cross-linked). 

These admixtures are based on the 2.2-dimethyl-propane-1.3-diol (neo-pentyl glycol) of the formula (CH3)2C(CH20H)2, or similar chemical compounds. They are added in amount about 4 kg/m of concrete. 

Non-accelerated, neo-pentyl glycol/isophthalic resin suitable for formulating into easily pigmented gel coats specifically designed for brush application and offering chemical, heat and weather resistance. 

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