MODIFIED EPOXY RESINS HAVING A NARROW MOLECULAR WEIGHT DISTRIBUTION
A process for preparing a modified epoxy resin with a molecular weight distribution of from 1.9 to 4.5 and an epoxy group content of less than 200 mmol/kg by reacting at a temperature of from 135 to 215 DEG C an aromatic epoxy resin having an epoxy group content of at least 250 mmol/kg and from 1.5...
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Main Authors | , , , |
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Format | Patent |
Language | English |
Published |
21.07.1993
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Edition | 5 |
Subjects | |
Online Access | Get full text |
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Summary: | A process for preparing a modified epoxy resin with a molecular weight distribution of from 1.9 to 4.5 and an epoxy group content of less than 200 mmol/kg by reacting at a temperature of from 135 to 215 DEG C an aromatic epoxy resin having an epoxy group content of at least 250 mmol/kg and from 1.5 to 2.2 epoxy groups per molecule with from 5 to 170% molar excess of a dihydroxy compound of formula: in which R is hydrogen or C1-C4 alkyl and n is a number of from 1 to 4, in the presence of an etherification catalyst selected from stannous halides and stannous carboxylates. |
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Bibliography: | Application Number: EP19920200290 |