Two-component solventless adhesive compositions for adhesion to polymeric barrier substrates

A two-component solventless adhesive composition, comprising:

• (A) an isocyanate component comprising an isocyanate blend of
• (i) an aromatic isocyanate,
• (ii) an aliphatic isocyanate, and
• the blend contains more aromatic isocyanate than aliphatic isocyanate;
• and
• (B) a polyol component comprising
• (i) from 2 wt % to 10 wt % of an amine-initiated polyol comprising two or more primary hydroxyl groups and a backbone incorporating a plurality of tertiary amines and having the Structure I:
• wherein
• R1 is a C1 alkyl group and R2 and R3 are independently a linear or branched alkyl group, the amine-initiated polyol has
• a functionality from 4 to 8,
• a hydroxyl number from 31 to 40 and
• a viscosity at 25° C. from 500 to 20,000 mPa·s,
• (ii) a plurality of non-amine-initiated polyols comprising
• (a) a polyether polyol, and
• (b) a polyester polyol;
• (iii) from 0.05 wt % to 0.2 wt % of a silicone-based additive, and weight percent is based on the total weight of the adhesive composition.

An article comprising:

• (1) a first film having a surface;
• and
• a first layer applied to the first film surface, the first layer comprising an isocyanate component (A) that is an isocyanate blend of
• (i) an aromatic isocyanate,
• (ii) an aliphatic isocyanate, and
• the blend contains more aromatic isocyanate than aliphatic isocyanate;
• (2) a second film having a surface;
• a second layer applied to the second film surface, the second layer comprising a polyol component (B) comprising
• (i) an amine-initiated polyol comprising two or more primary hydroxyl groups and a backbone incorporating a plurality of tertiary amines and having the Structure I:
• wherein
• R1 is a C1 alkyl group and R2 and R3 are independently a linear or branched alkyl group, the amine-initiated polyol has
• a functionality from 4 to 8,
• a hydroxyl number from 31 to 40 and
• a viscosity at 25° C. from 500 to 20,000 mPa·s,
• (ii) a plurality of non-amine-initiated polyols comprising
• (a) a polyether polyol, and
• (b) a polyester polyol;
• and
• (iii) a silicone-based additive.