Latent reactive adhesive preparations
AssigneeCovestro Deutschland AG
InventorsJoerg Buechner, Hans-Josef Laas, Harald Kraus, Martin Melchiors
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Abstract
The invention relates to the use of solid polycarbodiimide resins having a softening temperature of >+30° C. as cross-linking agents for adhesive dispersions polymers. The mixtures from at least one solid polycarbodiimide resin and at least one polymer dispersion are suitable for producing storage stable latent-reactive adhesive dispersions, latent-reactive adhesive layers, self-supporting latent reactive adhesive films or latent-reactive adhesive powders.
Claims14
A latently reactive, dispersion polymer-based preparation having a minimum film-forming temperature of ≤+23° C. and a glass transition temperature measured by DSC (heating rate 20 K/min) of ≤0° C. that can be crosslinked with carbodiimides and that comprises at least one polycarbodiimide having a glass transition temperature of at least +30° C. and an average functionality of at least 2, wherein the dispersion polymer is a semicrystalline polyurethane polymer or polyurethane-polyurea polymer.
An adhesive comprising a latently reactive, dispersion polymer-based preparation having a minimum film-forming temperature of ≤+23° C. and a glass transition temperature measured by DSC (heating rate 20 K/min) of ≤0° C. that can be crosslinked with carbodiimides and that comprises at least one polycarbodiimide having a glass transition temperature of at least +30° C. and an average functionality of at least 2, wherein
- the adhesive is a storage-stable, self-supporting latently reactive adhesive film, or
- the adhesive is a storage-stable, self-supporting latently reactive adhesive powder.
Dependencies are inferred from the claim text.