| 摘要 |
Regenerated cellulose fibres are treated so that they fibrillate when mixed with water by treating them with a dilute aqueous solution of a highly ionizable mineral acid under such conditions of acid concentration, temperature and time as to hydrolyse partially the cellulose of the fibres until its "average basic D.P." has been reduced to between 20 and 75% of the average basic D.P. of the cellulose of the original regenerated cellulose fibres without substantially reducing the weight of the fibres by partial solution. The acids may be hydrochloric or sulphuric, and a catalyst such as ferric chloride added, and the hydrolysis carried out under pressure. Temperatures of 95 DEG C. or above may be employed. The fibres may be from 2 mm. to 3/4 inch in length and may be blended with natural or synthetic paper-making fibres and converted into paper by known methods.
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