| 摘要 |
<p>The invention is a process for preparing a chemical pulp useful for preparation of cellulose derivatives and cellulose fibers. It involves first treating a conventional kraft pulp with an aqueous alkali to swell the fibers. The swollen fibers are then washed and further treated with an enzyme having cellulase activity. Temperature, concentration, and time of enzyme treatment are controlled so that a desired degree of polymerization is reached. Conditions are also controlled so that the pulp preferably remains in the Cellulose I phase during swelling and washing. The swelling and enzyme treatment can be made at any time before, during, or following the bleaching sequence. Endogluconases having a cellulose binding domain portion are preferred. The products of the invention are particularly useful in the manufacture of lyocell fibers.</p> |
