Patent ID: 9580538
Date: 2017-02-28
CPC Classifications: B32B,C08G,C09J,Y10T

Claim:
1. A two component adhesive suitable for use in transfer roll lamination equipment to make flexible packaging material comprising Component A and Component B; Component A comprising an isocyanate-functionalized polyurethane prepolymer; and Component B comprising a mixture of a high functionality polyol containing at least four hydroxyl groups per molecule with at least two primary OH groups on the molecule and two secondary OH groups on the molecule and a trifunctional polyol containing three OH groups on the molecule; wherein a mixture of Component A and Component B at a predetermined weight ratio has a pot-life based on viscosity doubling of at least about 25 minutes at a temperature of 40° C., a bond strength at 70° C. of at least 200 grams per inch after 24 hours of cure and has a BfR migration after 3 days of cure of less than 2 parts per billion, and each of these properties remains present throughout the range of Component A:Component B weight ratios of 25% less component A than the predetermined weight ratio, to the predetermined weight ratio, to 25 wt % more Component A than the predetermined weight ratio.