Method to increase the level of .alpha.-glycol in liquid epoxy r

Details Method to increase the level of .alpha.-glycol in liquid epoxy r Method to increase the level of .alpha.-glycol in liquid epoxy r

1993-10-18

1995-05-02

Wu, Shean

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528 87, 528499, 549517, C08F28300, C08G 5900, C07D30127

Patent

active

H00014397

ABSTRACT:
The performance of epoxy resins in several end-uses is enhanced by the presence of small quantities of hydrolyzed resin terminated by .alpha.-glycol groups. The invention is a process in which a mixture that contains liquid epoxy resin and water is reacted at elevated temperatures in order to hydrolyze epoxy groups into .alpha.-glycol groups, characterized in that: (1) the reaction temperature is between 130.degree. C. and 200.degree. C; (2) the reaction mixture contains 0.5 and 10 parts water per 100 parts resin by weight; and (3) the mixture contains 0 to 1 weight percent organic solvents and 0 to 100 ppm each of: organic acids, organic diacids, phosphonium compounds, and alkali or alkaline earth metals and their salts. The process raises the level of .alpha.-glycol groups in the resin, but uses no solvents or catalysts, so that it is easy to clean up the resulting resin.

REFERENCES:
patent: 4358577 (1982-11-01), McCrary et al.

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