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US 4,727,098 AGranted
Modified epoxy resins and process for producing same
AssigneeVianova Kunstharz, A.G.
InventorsWillibald Paar, Michael Honel
Life of this patent
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Abstract
Modified cationic epoxy resins wherein phenols linked through modified urea groups are used to extend the chain of diepoxy resins are described. The modified cationic resins can be formulated as paints which exhibit excellent properties particularly when used for electrodeposition paints.
Claims11
Process for producing cationic epoxy resins modified through chain prolongation, characterized in that a reaction product
- (A1) of two moles of an aminoalkylation product, carrying one NH-group, obtained through reaction of a phenol carrying at least one formaldehyde-reactive site, with a primary amine and formaldehyde and one mole of a diisocyanate,
- or a reaction product
- (A2) of one mole of a substituted urea obtained from one mole of a diisocyanate compound and two moles of a primary amine, two moles of formaldehyde, and two moles of a phenol having at least one formaldehyde-reactive site
- is reacted with
- (B) one mole per phenolic hydroxy group of a diepoxy compound through etherification of the phenolic hydroxy groups, and
- (C) the remaining epoxy groups are reacted with amine compounds or carboxy compounds whereby the final product carries basic nitrogen groups in a quantity corresponding to an amine value of from 35 to 150 mg KOH/g.
3 more elements
Cationic epoxy resin comprising the reaction product of a diepoxy resin with
- (A1) a reaction product of two moles of an aminoalkylation product, carrying one NH-group, obtained through the reaction of a phenol carrying at least one formaldehyde-reactive site, with a primary amine and formaldehyde and one mole of a diisocyanate,
- or
- (A2) reaction products of one mole of a substituted urea obtained from one mole of a diisocyanate compound and two moles of a primary amine, two moles of formaldehyde, and two moles of a phenol having at least one formaldehyde-reactive site,
- the ratio of diepoxy resin to reaction product (A1) or (A2) being on the basis of one mole of the diepoxy resin per phenolic hydroxy group on the reaction product of (A1) or (A2).
1 more element
Dependencies are inferred from the claim text.