Preparation of adhesive bonds using carbodiimide-containing dispersions with heat activation
AssigneeBASF SE
InventorsUlrike Licht, Eckehardt Wistuba, Hans J. Neumann
Life of this patent
Estimating the term…
Abstract
Adhesive bonds can be formed by a process that includes applying a dispersion containing a polyurethane which has structural units of formula (I) —N═C═N— (I) to a surface. The dispersion is first coated onto the surface to form a coating. The coating is dried to give an essentially anhydrous coating. The dried coating is then subjected to heat activation. The adhesive bond is formed by joining the heat activated coating to itself or to another surface.
Claims9
A process for producing an adhesive bond, said process comprising
- coating at least a portion of a surface of an article with a dispersion D to give a coating I,
- drying said dispersion D coated on said article to give an essentially anhydrous coating II,
- subjecting said coating II to heat activation to give a coating III, and
- joining said coating III to either a surface of another article or to itself to form an adhesive bond,
- wherein said dispersion D comprises a polyurethane (1), said polyurethane (1) comprising one or more carbodiimide structural units of the formula (I)
- —N═C═N— (I),
- wherein said one or more carbodiimide structural units are incorporated within the polymer structure of said polyurethane.
The process as claimed in claim 6, wherein the one or more polyisocyanates comprise polymerized units of tetramethylxylylene diisocyanate (TMXDI).
Dependencies are inferred from the claim text.