Rigid polyisocyanurate and polyurethane foams and methods for preparing the same

A composition for preparing polyisocyanurate and polyurethane foams, comprising:

• A) a first isocyanate-reactive component comprising a bisphenol represented by Formula 1,
• wherein L is a direct bond, an oxygen atom, a sulfur atom,
• —CH═CH— or a C1 to C8 alkylene group;
• X and X′ are independently selected from the group consisting of hydrogen atom, halogen atom and C1-C8 alkyl groups;
• n and m are independently an integer of 0, 1, 2, 3 or 4;
• B) a second isocyanate-reactive component different said first isocyanate-reactive component, wherein the second isocyanate-reactive component comprising one or more polyols having a hydroxyl value of 100 to 700 mg KOH/g;
• C) a polyisocyanate component comprising one or more compounds having at least two isocyanate groups;
• and
• wherein the amount of the bisphenol is from 5 wt % to 50 wt %, based on the combined weight of the first and the second isocyanate-reactive component.