Urethane-compatible polyester adhesion promoters

A polyester resin according to General Formula I:

• HO—[R1R2C(CH2—)2]a[—OCOCxHyCO2—]b[—CpHzO—]c—H
• wherein:
• R1 and R2 are each independently selected from the group consisting of H, C1-C4alkyl, and —CH2OH;
• x is an integer 1 through 10;
• y is an integer 2 through 20;
• p is an integer 2 through 8;
• z is two times p;
• each CxHy and CpHz are each independently linear or branched alkyl, optionally comprising an aromatic, or saturated or unsaturated alicyclic ring;
• a, b, and c are each independently an integer 1 through 100;
• provided that b<a+c;
• the Mw is less than 10,000;
• the Tg is less than 5° C.;
• the hydroxyl value is 225-300;
• and
• wherein the polyester resin is produced by a reaction of dibasic organic acids, one or more organic compounds with multiple functional groups, and one or more polyols.