Abstract: A gutter insert for a roofing gutter is provided. The roofing gutter has a rear wall, a bottom wall and a front wall. The gutter insert includes a body having a generally triangular cross-sectional shape formed from a top face, a back face and a diagonal face. The diagonal face forms a diagonal from one end of the top face to one end of the back face. A plurality of cutouts originate in the diagonal face and extend into the body. A void is defined by the diagonal face of the body of the gutter insert and the interior surfaces of the bottom wall and front wall of the roofing gutter. The cutouts and the void are configured to facilitate the flow of rain water through the roofing gutter.

Abstract: The present invention relates an MDI-based isocyanate-terminated prepolymer suitable for preparing a hydrophilic polyurethane polymer. The MDI-based composition comprises a prepolymer obtained by reacting isocyanate mixture comprising 2,4?-methylene diphenylisocyanate (MDI) and 4,4?-methylene diphenylisocyanate in a molar ratio of from 25:75 to 80:20 with a polyether polyol having an oxyethylene content of at least 30 percent by weight.