Storage-stable pigmented formulations containing isocyanate groups and use thereof
AssigneeCovestro Deutschland AG
InventorsJoerg Tillack, Dirk Achten, Monika Bach, Achim Weber, Fabian Schuster
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Abstract
The invention relates to storage-stable pigmented formulations containing isocyanate groups, comprising at least one pigment a., at least one component b. containing isocyanate groups, at least one wetting agent and/or dispersant c., at least one grind resin d. and optionally solvents, wherein the formulation has a viscosity increase of less than 500% after storage at 50° C. over a period of at least 3 days. The invention also relates to the production of such formulations and to the use thereof.
Claims15
A storage-stable, isocyanate group-containing formulation comprising the components:
- a. at least one pigment,
- b. 59.2% to 92.1% by weight of at least one isocyanate group-containing component based on a total weight of the storage-stable, isocyanate group-containing formulation,
- c. at least one wetting agent and/or dispersant,
- d. at least one grinding resin, and
- e. optionally solvents,
- wherein the storage-stable, isocyanate group-containing formulation after storage at 50° C. over a period of at least 14 days exhibits a rise in viscosity of less than 300%, based on a starting viscosity of the storage-stable, isocyanate group-containing formulation,
- wherein the storage-stable, isocyanate group-containing formulation comprises at least one component having at least one isocyanate-reactive group, wherein a molar ratio of isocyanate groups of component b to a sum of all isocyanate-reactive groups in the storage-stable, isocyanate group-containing formulation is at least 11:1.
A process for preparing a storage-stable, isocyanate group-containing formulation at least comprising:
- i. dispersing at least one pigment in at least one grinding resin in the presence of at least one wetting agent and/or dispersant, to obtain a pigment dispersion,
- ii. optionally diluting the pigment dispersion with solvent,
- iii. mixing the pigment dispersion with 59.2% to 92.1% by weight of an isocyanate group-containing component based on a total weight of the storage-stable, isocyanate group-containing formulation and at least one component having at least one isocyanate-reactive group to obtain the storage-stable, isocyanate group-containing formulation,
- wherein a ratio of a sum of isocyanate groups to a sum of all isocyanate-reactive groups in the storage-stable, isocyanate group-containing formulation is at least 11:1,
- wherein the storage-stable, isocyanate group-containing formulation after storage at 50° C. over a period of at least 14 days exhibits a rise in viscosity of less than 300%, based on a starting viscosity of the storage-stable, isocyanate group-containing formulation.
Dependencies are inferred from the claim text.