| 摘要 |
<p>SIZING COMPOSITIONS CONTAINING A FORMIC ACID SALT, PROCESSES, AND PAPER SIZED WITH THE COMPOSITIONS Novel sizing comprising an aqueous mixture of ammonia, an ammonium salt of formic acid, and a rosin that is modified with from about 5 to 50 percent, based on the weight of the rosin, of an organic acidic compound selected from the group consisting of an .alpha.,.beta. -unsaturated organic acid, an anhydride thereof, and their mixtures. In one embodiment, the ammonia and ammonium salt are produced as the reaction product of urea and formic acid. A method of making the sizing compositions and paper which is sized with the sizing compositions are also provided.</p> |
