| 摘要 |
Water-compatible compositions are described comprising at least one resinous compound whose backbone is linear and contains at least one oxyaryleneoxyalkylene or oxyaryleneoxy(1,3-(2-hydroxy)alkylene) unit and which bears at least two functional organic moieties through which cross-linking can occur (preferably groups having active hydrogen and/or blocked isocyanato groups, more preferably aliphatic hydroxyl groups) and at least one terminal pyridinium group covalently bonded through the pyridinium nitrogen atom. These compositions when mixed with water have a pH below 10. These compositions are useful coating compositions which find particular utility in cathodic electrodeposition. The compositions are prepared, for example, by reacting a linear epoxy resin with a pyridine in the presence of sufficient amount of a Bronsted acid and water to stabilize the pyridinium salt thus formed. Blocked isocyanates are compatible cross-linkers with the new resinous compositions. |
