| abstract |
(57) [Problem] To provide a foam which has high oil absorption ability, is biodegradable, and floats on the water surface. SOLUTION: A foam containing 0.15 to 5 parts by mass of a crosslinking agent added to 95.0 to 99.0 parts by mass of a starch-containing substance and extruded has a diameter of 1 to 5 times the die diameter, and a bulk ratio of A foam having a volume of 1 to 20 ml / g, an oil absorption capacity of 0.3 to 5 times its own weight, and floating in water for 10 minutes or more. |