Claims
- 1. Process for preparing cationic paint binders comprising the steps of (1) providing a polyhydroxyplyether containing primary hydroxyl groups; (2) reacting said polyhydroxypolyether with a diisocyanate having NCO-groups with different reactivities, said reaction being carried out at a temperature of from about 30 to 80.degree. C. to selectively react said primary hydroxyl groups with one of the NCO-groups of said diisocyanate in the presence of 0.02 to 0.1 mole percent of 1,4-diazabicyclo-2,2,2-octane as catalyst; (3) reacting at a temperature of 20 to 80.degree. C. the remaining NCO-group of said diisocyanate with primary or secondary aliphatic amines; and (4) reacting the primary and secondary hydroxyl groups present on the reaction product of (3) at least partially with a half-blocked diisocyannate, the components and proportions thereof being controlled so that a binder prooduced by the process will have a basicity which will permit said binder to be diluted with water after protonation.
- 2. Cationic paint binders comprising the reaction product of (1) a polyhydroxypolyetherr containing primary hydroxyl groups, and (2) a diisocyanate having NCO-groups having different reactivities; said reaction for preparing said reaction product being carried out at a temperature of from about 30 to 80.degree. C. and in the presence of 0.02 to 0.1 mole percent of 1,4-diazabicyclo-2,2,2-octane as catalyst to selectively react said primary hydroxyl groups of said polyhydroxypolyether with one of the NCO-groups of said diisocyanate; (3) subsequently reacting at a temperature of 20 to 80.degree. C. the remaining NCO-group of said diisocyanate with primary or secondary aliphatic amines; and (4) reacting the primary and/or secondary hydroxyl groups present on the reaction product of 3) at least partially with a half-blocked diisocyanate, the components and proportions thereof being controlled so said binder being produced will have a basicity which will permit said binder to be diluted with water after protonation.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2882/87 |
Nov 1987 |
ATX |
|
Parent Case Info
This is a division of application Ser. No. 07/266,561, filed Nov. 3, 1988, now U.S. Pat. No. 4,939,226.
US Referenced Citations (8)
Non-Patent Literature Citations (1)
Entry |
Jouranl of Polymer Science: Polymer Letters Edition, vol. 23, pp. 509-515, 1985--Ono et al. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
266561 |
Nov 1988 |
|