Coating composition
AssigneeBollig & Kemper KG
InventorsHans-Dieter Hille, Horst Müller
Life of this patent
Estimating the term…
Abstract
Coating composition obtainable by mixing a) a composition A containing a dispersion of a polyurethane having an acid number of more than 20 and comprising as its soft segment at least one polytetrahydrofuran segment having a number-average molecular weight of between 650 and 5000 and as its hard segment at least one segment derived from a diisocyanate; with b) a composition B containing a dispersion of a polyurethane having an acid number of less than 20 and comprising as its soft segment at least one polytetrahydrofuran segment having a number-average molecular weight of between 800 and 5000 and as its hard segment at least one segment derived from a diisocyanate.
Claims33
Coating composition comprising a mixture of:
- a) composition A, comprising a dispersion of a polyurethane having an acid number of more than 20 and comprising as its soft segment at least one polytetrahydrofuran segment having a number-average molecular weight of between 650 and 5000 and as its hard segment at least one segment derived from a diisocyanate;
- with
- b) a composition B, comprising a dispersion of a polyurethane having an acid number of less than 20 and comprising as its soft segment at least one polytetrahydrofuran segment having a number-average molecular weight of between 800 and 5000 and as its hard segment at least one segment derived from a diisocyanate.
A process for producing a coating for an electrically conductive substrate or a plastic surface, comprising a step of mixing:
- a composition A comprising a dispersion of a polyurethane having an acid number of more than 20 and comprising as its soft segment at least one polytetrahydrofuran segment having a number-average molecular weight of between 650 and 5,000 and as its hard segment at least one segment derived from a diisocyanate;
- with
- a composition B comprising a dispersion of a polyurethane having an acid number of less than 20 and comprising as its soft segment at least one polytetrahydrofuran segment having a number-average molecular weight of between 800 and 5,000 and as its hard segment at least one segment derived from a diisocyanate.
A multicoat paint system comprising:
- a first coat situated on an electricall conductive substrate and comprising an electrophoretically disposed coating material;
- a second, color-imparting coat comprising a coating composition composed of a mixture of a composition A comprising a dispersion of a polyurethane having an acid number of more than 20 and comprising as its soft segment at least one polytetrahydrofuran segment having a number-average molecular weight of between 650 and 5,000 and as its hard segment at least one segment derived from a diisocyanate, with a composition B comprising a dispersion of a polyurethane having an acid number of less than 20 and comprising as its soft segment at least one polytetrahydrofuran segment having a number-average molecular weight of between 800 and 5,000 and as its hard segment at least one segment derived from a diisocyanate;
- and
- a third coat comprising a clear coat.
A multicoat paint system consisting of:
- a first coat situated on an electrically conductive substrate and comprising an electrophoretically deposited coating material;
- a second coat comprising one of a primer and surfacer;
- a third, color imparting coat comprising a coating comprising a coating composition form from a mixture of a composition A comprising a dispersion of a polyurethane having an acid number of more than 20 and comprising as its soft segment at least one polytetrahydrofuran segment having a number-average molecular weight of between 650 and 5,000 and as its hard segment at least one segment derived from a diisocyanate, with a composition B comprising a dispersion of a polyurethane having an acid number of less than 20 and comprising as its soft segment at least one polytetrahydrofuran segment having a number-average molecular weight of between 800 and 5,000 and as its hard segment at least one segment derived from a diisocyanate;
- and
- a fourth coat comprising a clear coat.
Dependencies are inferred from the claim text.