Active Polymer Modification of Bitumen for Use in Roofing Materials

摘要

A modified bitumen consisting of a polyurethane wherein the polyisocyanate or polyisocyanate-dominated polyurethane prepolymer (or prepolymers) is first reacted with the bitumen to take advantage of the bitumen's hydroxyl and amine functionality and form an isocyanate-bitumen adduct to form a weatherproofing product.

主权项

1. An actively modified polymer-modified bitumen formulation comprising:
25-75 wt. % of a first component that consists of bitumen, coal tar, or combinations thereof; 2-45% wt. % of a second component that consists of polyurethane, or blend of polyurethane and rubber; wherein a weight percent of said first component is greater than a weight percent of said second component, said isocyanate end groups in said polyurethane reacting with hydroxyl end groups in bitumen, coal tar, or combinations thereof, said formulation can be used to create a membrane having improved mineral retention and weatherability.