Patent ID: 11926769
Assignee: TESA SE
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 9:
10. A reactive pressure-sensitive adhesive film, comprising:
(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,
wherein the (b) one or more reactive components is present at a mass fraction of at least 30%, as based on the sum of (a), (b) and (c), and
further wherein at least 50 wt % of the polymeric film former matrix is a crystallizable polymer that is a polyurethane which:
(i) exhibits a crystallization enthalpy of less than 1 J/g in a differential scanning calorimetry (DSC) measurement, as measured on cooling at a rate of 10 K/min from a starting temperature which is at least 30 K above a peak temperature of the melting peak of the crystallizable polymer or at least 100° C., whichever starting temperature is greater; and
(ii) exhibits a crystallite fusion enthalpy of at least 15 mJ/mg in its pure state, as measured in a first heating curve of a DSC measurement at a heating rate of 10 K/min and after storage for at least one month in a temperature range from 15 to 25° C. and at a relative humidity in the range from 30 to 70%.