Polyurea coatings compositions and coating having improved flexibility
AssigneeBayer Aktiengesellschaft
InventorsRobert A. Wade, Terrell D. Wayt
Life of this patent
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Abstract
The present invention relates to a coating composition for the preparation of a polyurea coating which contains a) a polyisocyanate component containing one or more aliphatic polyisocyanates, b) at least one polaspartic acid ester c) 0.05 to 5% by weight, based on the total weight of the coating composition, of an organic acid, wherein components a) and b) are present in amounts sufficient to provide an equivalent ratio of isocyanate groups of component a) to isocyanate-reactive groups of component b) of 0.5:1 to 20:1.
Claims19
A coating composition for the preparation of a polyurea coating which comprises
- a) a polyisocyanate component containing one or more aliphatic polyisocyanates,
- b) at least one compound corresponding to the formula ##STR3## wherein X represents an organic group which has a valency of n, is inert towards isocyanate groups at a temperature of 100.degree. C. or less and is obtained by the removal of the amino groups from an aliphatic polyamine,
- R.sub.1 and R.sub.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.sub.3 and R.sub.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 represents an integer with a value of at least 2, and
- c) 0.01 to 5% by weight, based on the total weight of the coating composition, of an organic acid,
- wherein components a) and b) are present in amounts sufficient to provide an equivalent ratio of isocyanate groups of component a) to isocyanate-reactive groups of component b) of 0.5:1 to 20:1.
A coating composition for the preparation of a polyurea coating which comprises
- a) a polyisocyanate component containing one or more polyisocyanate adducts based on 1,6-hexamethylene diisocyanate,
- b) at least one compound corresponding to the formula ##STR4## wherein X represents an organic group which has a valency of n, is inert towards isocyanate groups at a temperature of 100.degree. C. or less and is obtained by the removal of the amino groups from an aliphatic polyamine,
- R.sub.1 and R.sub.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.sub.3 and R.sub.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 represents an integer with a value of at least 2, and
- c) 0.05 to 3% by weight, based on the total weight of the coating composition, of an organic acid,
- wherein components a) and b) are present in amounts sufficient to provide an equivalent ratio of isocyanate groups of component a) to isocyanate-reactive groups of component b) of 0.5:1 to 20:1.
A coating composition for the preparation of a polyurea coating which comprises
- a) a polyisocyanate component containing at least one polyisocyanate containing isocyanurate groups and based on 1,6-hexamethylene diisocyanate,
- 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.sub.1 and R.sub.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.sub.3 and R.sub.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 represents an integer with a value of at least 2, and
- the coating composition additionally contains
- c) 0.05 to 3% by weight, based on the total weight of the coating composition, of an organic acid,
- wherein components a) and b) are present in amounts sufficient to provide an equivalent ratio of isocyanate groups of component a) to isocyanate-reactive groups of component b) of 0.5:1 to 20:1.
Dependencies are inferred from the claim text.