US1929115A - Sizing composition for paper or the like - Google Patents

Description

Patented'oct. 3, i933 I Edward J. Johnstone, Lockport, N. Y.

No Drawing. Application November 29, 1929 Serial No. 410,656

. 4 Claims. .(ol. 134-21) More particularly, my invention pertains in part to that portion'of the fieldfor sizing compositions of matter made wholly or in part of cellulose fibres, wherein such compositions ofmatter do not receive either a degree of heat or" a length of drying time, or both, that is commonly used in the manufacture of paper.

Also, through using the products and processes embodied in the present invention, it is possible to reduce, in the manufacture of paper, paper board and other fibrous products composed wholly or in part of cellulose fibres, the use of high temperatures andprolonged drying time heretofore necessary in the prior art.

It is a fact that, in order to secure the optimum sizing effect in compositions of matter containing cellulose fibres, either wholly or in part, it has hithertobeen necessary to very thoroughly dry such compositions of. matter. This extreme degree of drying has entailed much difficulty in its accomplishment, particularly when the cellulose compositions hereinbeforementioned have been thick and possess a high degree of insulating .value. However, in any case, even in thin sheets of paper, unless a most exacting and-rigorous degree of dryness is attained, the paper will-not be adequately sized to the optimum degree.

The scope of the present invention is, therefore, twofold, first, to increase'the sizing of relatively thick compositions of matter composed wholly or in part of'cellulose fibres, and which offer a high degree of insulating value during their drying process; and, second, to permit of making relatively thin compositions of matter composed wholly or in part of cellulose fibres in a more expeditious manner with the same amount of heat as hitherto used, and at thesamerate of present production with less drying equipment.

From the foregoing it is possible, although not proven, that ordinary rosin size such as'papermakers use requires the a removal of -moisture from it beyond a certain point or degree in order to have it exert its optimum sizing effect. Whether this is true or not, it is a fact that, unless compositions of mattersized in the ordinary,

manner with rosin size, are dried to a certain point the optimum degree of sizing is not attained. I havefound that the hereinbefore-mentioned and other disadvantages of ordinary rosin size can be overcome wholly or in part by incorporating into the rosinsize an oleaginous material derived from the so-called tall pine, particularly, but not wholly, indigenous to the Scandinavian countries.

This oil, known in Sweden as flytande harts,

sir rind coniros'iirron ea-must on THE appears on the market and is commonly known as tallol, Swedish, resinous oil, pineolin, Swedish olein. Inmost cases, the just-mentioned oleagi nous material is a by-product derived from the well-known soda pulp. It also may be specially extracted from the wood by suitable alkaline solutions and is obtained in Scandinavia by treating rosin-rich conifer wood with B. sodium hydroxide and hydrolyzing-the soaps obtained by mineral acids. It is a dark brown relatively fluid oil which'does not solidify ordinarily at C., is easily soluble in alcohol, acetone and ether but incompletely-soluble in spirits of turpentine and in benzone. 1

More specifically, in cooking rosin size according to known means, wherein rosin is added to aqueous'solutions of compounds of alkali metals, I add also, and simultaneously cook, the hereinbefore-mentioned Swedish tallol. 1

As an example of the present invention, I may take one hundred parts of rosin, by weight, and

add it little by little to an aqueous solution containing water to the amountof forty parts by weight of the rosin,in which is dissolved twenty parts byweight of soda ash, cook the beforementioned ingredients until the mass is molten, and then addten parts by weight of the rosin of Swedish tallol. I may then cook the resulting mixture about five hours until homogeneity is secured and a chemical, or quasi-chemical, or colloidal paste results.

The foregoing is an example of my process and the product resulting therefrom; but I do not in any wise restrict myself to the hereinbefore-mentioned proportions. I may, withoutin any wise departing from the scope of my invention, add as much as thirty percent of Swedish tallol instead of ten percent as hereinbefore mentioned, both quantities being by weight of the original rosin. And I may use more soda ash, more water, etc., but the feature common in every caseis that I include talloI in the rosin size for the purpose of reducing the melting point of the rosin size; and. through this or other means permitting of the optimum sizing of paper at final moisture contents in excess of those hitherto attained.

In sizing paper, paper board and other compositions of matter composed wholly or in part of cellulose fibres according to the present invention, I take'the hereinbefore-mentioned combination or mixture of Swedish tallol, rosinsize and water, and, according to known means, incorporate the same into the fibrous products hereinbefore mentioned, preferably during their formation and also preferably during the well-- known beating process. i precipitate the hereinbefore-mentioned mixture of tallol, rosin size and water, after adding it to the beater and thoroughly incorporating it with the cellulose pulp,

by the addition of sulphate of alumina, the alums or other known means.

The resulting mixture of sized pulp is then processed according to the desired methodin order to produce the desired finished article, according to known methods; except that, as hereinbefore described, the materials may be run more rapidly during the drying process, or run at the same rate with a shorter drying period.