VISCOELASTIC FOAM SYSTEM

摘要

A viscoelastic foam system comprises a viscoelastic foam and spheres dispersed in the viscoelastic foam. Each sphere comprises a gas-filled spherical particle and a polyurethane coating disposed about the gas-filled spherical particle. The polyurethane coating comprises the reaction product of a prepolymer and a polyol component. The prepolymer comprises the reaction product of an isocyanate component and an isocyanate-reactive component, and the prepolymer comprises from 2.5 to 3.6 % by weight of urethane groups based on 100 % by weight of the prepolymer. The polyurethane coating disposed about the gas-filled spherical particle has a shore OO hardness value of from about 20 to about 50 measured according to ASTM D2240 type OO hardness scale.