| abstract |
PROBLEM TO BE SOLVED: To provide a novel purified solid natural rubber having excellent mechanical properties, high insulation properties, low water absorption and allergy-free properties, and excellent in processability, and a method for producing the same. I do. SOLUTION: The purified solid natural rubber of the present invention has a protein content of 0.02% or less in terms of nitrogen content and a bound fatty acid content of 0.05% by weight or less, and substantially It is characterized by not containing proteins and bound fatty acids. Such a purified solid natural rubber, a solid natural rubber, a vulcanized natural rubber or a material obtained by swelling them in advance with a hydrocarbon solvent, was immersed in a mixture of a predetermined amount of an alkali hydroxide, a specific alcohol and water. Thereafter, it is manufactured by washing with water and drying. |