Polyurethane foam and pneumatic tire

摘要

A polyurethane foam which is obtained by a reaction between a diol component and a diisocyanate component, with the diol component being a mixture of a polyether-based diol and a polyester-based diol, and a pneumatic tire to which the polyurethane foam is applied are provided. When a soft polyurethane foam is produced using a mixture of a polyether-based diol and a polyester-based diol as the diol component, and by varying the content of the expanding agent during the production process, and when the polyurethane foam is disposed in the cavity of a pneumatic tire, the polyurethane foam thus produced has an effect of reducing the resonance noise generated in the cavity of the tire and improving durability of the tire.

主权项

1. A pneumatic tire including a polyurethane foam in its internal cavity wherein the polyurethane foam is obtained by using a composition for forming the polyurethane foam comprising a diol component and a diisocyanate component, wherein the diol component is a mixture of a polyether-based diol and a polyester-based diol,
wherein the polyether-based diol is polypropylene oxide and the polyester-based diol is polycaprolactone; wherein the polyester-based diol has a hydroxyl group value of 260 to 325 mg KOH/g.