PRESSURE-SENSITIVE ADHESIVES EXHIBITING AN IMPROVED SHEAR STRENGTH AT ELEVATED TEMPERATURES

Production of an adhesive layer containing at least one isocyanate reactive polymer and a solid surface-deactivated polyisocyanate and to increase its shear strength, comprises heat treatment at a temperature, preferably ≥ 40 degrees C above the drying temperature. The shear strength of the resultin...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
1. Verfasser:	ABEND, THOMAS, P
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE ADHESIVES CHEMISTRY COMPOSITIONS BASED THEREON DYES MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL ORGANIC MACROMOLECULAR COMPOUNDS PAINTS POLISHES THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF MATERIALS AS ADHESIVES
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	Production of an adhesive layer containing at least one isocyanate reactive polymer and a solid surface-deactivated polyisocyanate and to increase its shear strength, comprises heat treatment at a temperature, preferably ≥ 40 degrees C above the drying temperature. The shear strength of the resulting adhesive joint is at least 10% higher than without the heat treatment. A process for the production of an adhesive layer and to increase its shear strength comprises: (A) preparation of an aqueous dispersion or solution containing at least one isocyanate reactive polymer and a solid surface-deactivated polyisocyanate; (B) application of the aqueous dispersion or solution onto a substrate; (C) production of an adhesive layer by removal of the water by drying at 20-95 degrees C (preferably 50-95 degrees C); and (D) performing heat treatment where the layer is heated continuously, stepwise or directly to a temperature, preferably at least 40 degrees C above the drying temperature. The shear strength of the resulting adhesive joint is at least 10% higher than without the heat treatment and the isocyanate reactive polymer and the solid surface-deactivated polyisocyanate are chosen such that following step (C), the adhesive layer has a loop tack of at least 2 N/inch.