Polyurea coating compositions having improved pot lives

A coating composition for the preparation of a polyurea coating which comprises

• a) a polyisocyanate component,
• b) at least one compound corresponding to the formula ##STR5## wherein X represents an organic group which has a valency of n and is inert towards isocyanate groups at a temperature of 100.degree. C. or less,
• R.sup.1 and R.sup.2 may be identical or different and represent organic groups which are inert towards isocyanate groups at a temperature of 100.degree. C. or less,
• R.sup.3 and R.sup.4 may be identical or different and represent hydrogen or organic groups which are inert towards isocyanate groups at a temperature of 100.degree. C. or less, and
• n represent an integer with a value of at least 2, and
• c) 0.01 to 1 weight percent, based on the weight of component a) and b), of a dialkyl tin(IV) compound which contains a group selected from the group consisting of ester, sulfide, bisulfide, thiol and/or halide groups and which increases the reaction rate between isocyanate and hydroxyl groups by a factor of 100 when present in an amount of 1 mole percent in comparison to the reaction of these groups in the absence of a catalyst, yet increases the pot life of said coating composition when compared to the pot life of an identical coating composition which does not contain said tin(IV) compound.

A coating composition for the preparation of a polyurea coating which consists essentially of

• a) a polyisocyanate component,
• b) at least one compound corresponding to the formula ##STR6## wherein X represents an organic group which has a variety of n and is insert towards isocyanate groups at a temperature of 100.degree. C. or less,
• R.sup.1 and R.sup.2 may be identical or different and represent organic groups which are inert towards isocyanate groups at a temperature of 100.degree. C. or less,
• R.sup.3 and R.sup.4 may be identical or different and represent hydrogen or organic groups which are inert toward isocyanate groups at a temperature of 100.degree. C. or less, and
• n represents an integer with a value of at least 2, and
• c) 0.001 to 5 weight percent, based on the weight of components a) and b), of a tin(IV) compound which is a catalyst for the reaction between isocyanate groups and hydroxyl groups, yet increases the pot life of said coating composition when compared to the pot life of an identical coating composition which does not contain said tin(IV) compound.