Patent ID: 8318822

Claim:
A vibration damping and sound absorbing material comprising a polyurethane foam which comprises, as raw materials, a polyol, water, a catalyst and a polyisocyanate, wherein the polyol comprises: (A) a plant-derived polyol having a hydroxyl group value of from 65 to 170 mgKOH/g, a polyoxyalkylene polyol having a hydroxyl group value of from 15 to 60 mgKOH/g, and a polymer-dispersed polyol in which polymer fine particles obtained by polymerizing an unsaturated bond-containing compound are dispersed in a polyol, wherein the plant-derived polyol (A) comprises at least one plant-derived polyol selected from the group consisting of: (A4) a plant-derived polyester polyol at least having a structure such that a hydroxycarboxylic acid, which comprises a castor oil aliphatic acid containing, as a main component, recinoleic acid obtained from castor oil and/or a hydrogenated castor oil aliphatic acid containing, as a main component, 12-hydroxystearic acid obtained by saturating carbon-carbon double bond in the castor oil aliphatic acid, is condensed in a polyhydric alcohol having 2 to 6 hydroxyl groups in one molecule, (A5) a polyol obtained by, further, adding lactone to the plant-derived polyester polyol (A4), and (A6) a polyol obtained by, further, adding a hydroxy carboxylic acid having a primary hydroxyl group to the plant-derived polyester polyol (A4), wherein a test piece having a thickness of 20 mm obtained by the vibration damping and sound absorbing material has a maximum sound absorbing coefficient, as measured in accordance with a 2 microphone method by ISO10534-2, of from 0.80 to 1.0.