Propylene Glycol → HCID 86751389, compound

Participants

Reaction Conditions

Reaction Steps

A three-liter reactor equipped as described in Example 2 is charged with a mixture of maleic anhydride (750 g) and phthalic anhydride (250 g), which is melted by heating to 70° C. Propylene glycol (348 g) is added, and the exothermic reaction is maintained at 130° C. or less until the reaction subsides (about 2 h). The acid number of this bis-maleate/phthalate intermediate is 417 mg KOH/g. A 3000 mol. wt. polyoxypropylene triol (1152 g) and p-toluenesulfonic acid (2.5 g) are added, and the mixture is heated at 190° C. until the acid number drops to 123 mg KOH/g. Propylene glycol (237 g) is added, and heating continues until the acid number reaches 42 mg KOH/g. The product is cooled and isolated (2372 g, 89% yield). GPC analysis shows: Mn =1475, Mw=7590. A blend of the resin with 40 wt. % styrene has APHA color =150.

Provenance & Evidence