Storage-stable, reactive, pressure-sensitive adhesive tape

US11926769B2 · kind B2 · utility

Assignee

• tesa SE · DE

Inventors

• Klaus Keite-Telgenbüscher · Hamburg, DE
• Frank Hannemann · Roetgen, DE
• Claudia Moehrke · Hamburg, DE
• Stefan Kramp · Villach, AT

Key dates

• Filing date: Jun 29, 2021
• Grant date: Mar 12, 2024
• Expiry date: Dec 26, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09J2475/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A reactive PSA film that includes: (a) a polymeric film former matrix; (b) one or more reactive components; and (c) a reagent selected from an initiator, a curing agent and an activator. The component (b) is present at a mass fraction of ≥30%, as based on the sum of (a), (b) and (c). Further, ≥50 wt % of the film former matrix is a crystallizable polymer which: (i) exhibits a crystallization enthalpy of <1 J/g in a DSC measurement on cooling at 10K/min from at least 30K above a peak temperature of the melting peak of the polymer or ≥100° C., whichever is greater; and (ii) exhibits a crystallite fusion enthalpy of ≥15 mJ/mg in its pure state in a first heating curve of a DSC measurement at 10K/min and after storage for ≥one month from 15 to 25° C. and relative humidity from 30 to 70%.