초록 ▼

A process for the production of oligomeric mixtures useful as surfactants is disclosed. The initial step of the process comprises reacting pyromellitic dianhydride with a fluoroalcohol using a mole ratio of about one mole pyromellitic dianhydride per two moles of fluoroalcohol to produce an intermed

A process for the production of oligomeric mixtures useful as surfactants is disclosed. The initial step of the process comprises reacting pyromellitic dianhydride with a fluoroalcohol using a mole ratio of about one mole pyromellitic dianhydride per two moles of fluoroalcohol to produce an intermediate which contains two fluorinated ester moieties and two free acid moieties. Thereafter, the intermediate diester-diacid is reacted with an excess of an oxirane compound such as epichlorohydrin, epibromohydrin or propylene oxide wherein said oxirane compound reacts with the free acid moieties to produce ester moieties containing a primary or secondary alcohol moiety. In the final step of the process, additional pyromellitic dianhydride is added to the reaction mixture so that the alcohol moieties may react with anhydride moieties to produce ester linking groups (between pyromellitate nuclei) and additional free acid moieties capable of reacting with the oxirane compound.

대표청구항 ▼

A process for the production of an organic mixture useful as a fiber surface modifying agent wherein said mixture comprises oligomeric compounds and wherein said process comprises: (a) reacting pyromellitic dianhydride with fluorinated alcohol at a mole ratio of about two moles of fluorinated alcoho

A process for the production of an organic mixture useful as a fiber surface modifying agent wherein said mixture comprises oligomeric compounds and wherein said process comprises: (a) reacting pyromellitic dianhydride with fluorinated alcohol at a mole ratio of about two moles of fluorinated alcohol per mole of pyromellitic dianhydride to produce a pyromellitate having two fluorinated ester moieties and two carboxylic acid moieties; (b) reacting said pyromellitate of step (a) with an excess of an oxirane compound selected from the group consisting of epichlorohydrin, epibromohydrin, and propylene oxide in the presence of additional pyromellitic dianhydride to produce said organic mixture comprising oligomeric compounds; wherein said oxirane compounds react with said carboxylic acid moieties to produce an ester having a primary or secondary alcohol, and wherein said alcohol reacts with said additional pyromellitic dianhydride to produce ester-linking moieties and carboxylic acid moieties capable of reacting with said oxirane compound to produce additional esters having primary or secondary alcohols.