US1411371A - Impregnating and coating composition and method of preparing same - Google Patents

Description

I am familiar.

UNITED STATES PATENT OFFICE..-

EARLE T. OAKES, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, T0

NATIONAL BISCUIT COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

IMPREGNATING AND COATING- COMPOSITION AND METHOD OF PREPARING SAME.

No Drawing.

T 0 all whom it may concern.

Be it known that I, EARLE T. Qaxnsmesiding in the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Impregnating and Coating Compositions and Methods of Preparing Same, of which the following is a specification.

My invention relates to a composition embodying gelatinized tung oil contained, in subdivided condition, in a suitable liquid carrier whereby the composition may readily be used for impregnating 'or coating paper and other material. My invention also relate s to processes for producing such a product.

Tung oil, or China Wood oil, may be converted by suitable heat treatment into a rubbery gelatinous condition, which product I refer to as gelatinized tung oil. Thls product is insoluble in all solvents with which I have found that when paper or cardboard is impregnated with this gelatinized tung oil it becomes not only moisture-proof but also grease-proof. Paper or cardboard impregnated or coated with the same is, therefore, a highly desirable material for use, for example, as a container or wrapping for food products, especially since the gelatinized tung oil may be taken into the human system without harmful effect. The gelatinized tung oil has desirable properties in addition to those mentioned above so that paper or fibrous material impregnated with the same will have various uses.

The tung oil may be gelatinized by heating the same to a temperature of approximately 250 degrees C. for about .nine to twelve. minutes. The product may also be formed by heating the same to approximately one hundred degrees C. for a period of from twelve to fourteen hours. Applica tion of the higher temperature. is, however, preferable, not only because of the saving in time but also because a more uniform product is produced and there is less oxidation, as is apt to be the case when the lower temperature for the longer time is employed.

If it be attempted to impregnate paper or other fibrous material with a gelatinized product, by impregnating the material with raw oil and then heating the same to gelatinize the oil, the difliculty at once arises Specification of letters Patent.

Patented Apr. 4, 1922..

Application filed January 19,1920. Seuial No. 352,543.

'gelatinized product and thereafter driving off the solvent has apparently been nonexistent.

' In accordance with my invention, I overcome these difficulties by placing the gelatiniaed product, in a finely subdivided condition, in suspension or colloidal solution in a. suitable liquid carrier. Ihave found that when certainliquids are added to the gelatnized tung oil they have the effect of causing the same to swell or increase in bulk to a considerable extent, apparently to four or five times the original bulk of the gelatinized Oll. When the gelatinized oil, mixed with the liquid carrier and swollen thereby, and ground or otherwise comminuted to a state of fine subdivision, is added toa sufiicient quantity of the liquid carrier it is found that the particles of gelatinized product remain suspended for a considerable time, apparently in a state of colloidal solution, in the liquid carrier.

I have found that various solvents such as those which are commonly used in the making of varnish and the like, are suitable hol, carbon'tetrachloride, ether and acetone.

These liquids are solvents for gums and resins generally and therefore various of the well known gums and resins may be added to the composition, if so desired, to add body and strength to the composition which results after the solvent or liquid carrier has been driven off.

In practicing my improved process and producing the product described herein, the tung oil is gelatinized by heat treatment as above described, preferably by an application'ofheat at about 250 degrees C. for a sufficient length of time. The liquid carrier referred to, such for example as solvent naphtha. or turpentine, may be poured on the gelatinized oil when the latter has been formed and cooled, or at the moment when the oil begins to gelatinize during its heat treatment. Or, the liquid and the gelatinized oil may be mixed during the grindin or comminuting of the gelatinize oil. have found that the presence of the liquid carrier and swelling agent, such as solvent naphtha or tu ntine referred to, results in making the g eldtinized oil very much less sticky and gummy than it otherwise would be so that it is much easier to grind or cut or otherwise comminute the gelatinized oil when the liquid carrier is present.

The gelatinized oil may accordingly be passed through grinding rolls or between suitable cutters together with a sufficient quantity of the li uid carrier of the character referred to. he bestprocedure is probaby to adda sufiicient amount of the li uid carrier to the gelatinized product be ore grinding to cause a considerable swelling of the gelatinized body and to add more of the liquid carrier to the gelatinized product during the grinding of comminuting operation if it is found that the rolls or knives are getting gummed up. After the grinding or comminuting has been finished an additional amount of liquid carrier may be added in accordance with the degree of fluidity which is desired for the product. The solvent or liquid carrier may effectively be used through a wide range of proportions,

' for example, in proportions of from two to ten times the volume of the gelatinized prodnot. The result is a free flowing liquid containing the gelatinized product in colloidal solution or sus nsion.

If added b ies such as the common gums are thought desirable for incorporation in the mass, the same maybe added to the tung oil either before or after the gelatinizing of the oil, preferably before. Among the substances which may effectively be added may be mentioned shellac, resin, sandarac, etc.

If paper or the like is to be coated 01' impregnated with the material, the article may be'dipped or brushed or otherwise treated with the fluid material. Thus paper may be run through a bath of the composition and subsequently thro'u h squeeze rolls in the usual way. After t e paper or fibrous material has been coated or impregnated the material is dried to drive off the solvent or liquid carrier, the resulting product having the desirable properties named.

It will be understood that my invention is not limited strictly to the details particularly described, but is as broad as is indidated by the accompanying claims.

copal, kauri,

What I claim is: 1. A new composition of matter, comprising gelatinizing tung oil in colloidal solution in a suitable liquid carrier adapted to condition, and a solvent for gums and resins,-

having the property of swelling the gelatinized tung oil on additionthereto, the gelatinized tung oil being contained in the solvent 'inthe condition of colloidal solution or suspension.

4. A new composition of matter, con1-' prising gelatinized tung oil in finely subdivided condition, a solvent for gums and resins, having the property of swelling the gelatinizedtung oil on addition thereto, and a substance of the gum class dissolved in said solvent.

5. Theprocess of preparing a composition, comprising, heatin tung oil to gelatinize the same, subdividing the product and adding a liquid, adapted to swell the elatinized product and contain the same in nely subdivided form, in suspension.

6. The process of preparing a composition, comprising, heating tung oil to gelatinize the'same, subdividing the product and adding a solvent for gums and resins, having the property of swelling the gelatinized product, in sufiicient quantity to form a fluid mass containing the swollen subdivided gelatinized product. i

7. The process of preparing a composition, comprising, heating tung oil to gelatiuize the same, adding a liquid, adapted to swell the gelatinized product and to contain the same, when in subdivided form, in sus pension,- and subdividi the gelatinized product in the presence 0 said liquid.

This specification signed and witnessed this 15th day of January, 1920.

EARLE. T. OAKES. Witnesses: CLARKE E. DAVIS, D. J. MAVEETI'.