US2451362A

US2451362A - Lining composition and container wall lined therewith

Info

Publication number: US2451362A
Application number: US585391A
Authority: US
Inventors: Rudolph M Snyder
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-03-28
Filing date: 1945-03-28
Publication date: 1948-10-12
Anticipated expiration: 1965-10-12

Description

Patented Oct. 12, 1948 LINING COMPOSITION AND CONTAINER WALL LINED THEREWITH Rudolph M. Snyder, Kansas City, Mo., assignor to Henry A. Johnson, Kansas City, Mo.

No Drawing. Application March 28, 1945,

Serial No. 585,391

8 Claims. 1

This invention relates to a novel barrier lining or coating composition for cartons, barrels and other containers that are used for storing and shipping solid or semi-solid substances such as asphalt, bitumens, resins, tars and the like which have a tendency to adhere to the walls of the container, and to the method of making it. It also relates to containers lined with the coating of my invention to prevent the solid contents of the container from adhering to the walls thereof.

The containers to which the coating or lining composition of my invention is applied may be of a permanent character such aswood, metal, etc., and they may also be of the so-called throwaway carton or drum type which are used but once, such as containers made from paper board,

box board, wood pulp and like fibrous materials. The fibrous cartons and drums are now more generally used to store and ship such products as solidified asphalt, for example, since these filled containers are more readily transported and are less costly. My invention will be particularly described in connection with such containers, but it is to be understood, however, that it is not to be construed as limited thereto since the lining or coating composition of my invention is also a very eifective barrier lining or coating which prevents thesolid contents from adhering to the walls of the more permanent, type of containers such as wood barrels and metal drums.

Materialswhich are liquid when hot and solids when cooled such as asphalt, for example, when prepared for storage or shipping, are usually piped or poured hot into fibrous cartons or drums and permitted to cool and solidify. On cooling, the asphalt tenaciously adheres to the walls of the container making it exceedingly difficult, if not impossible, to strip the container from the asphalt without leaving adherent pieces of the container on the asphalt. The prior art carton or drum coatings or linings which have been used heretofore to prevent adherence of solidified asphalt to the container walls and permit the ready stripping of the. container from the asphalt have not been entirely satisfactory and/or have been so costly as to make their use prohibitive.

In accordance with the present invention I have provided a novel composition which is unusually effective as a barrier coating or lining for containers adapted to receive hot liquefied products such as asphalt, bitumens, resins, etc., to prevent the adherence of the solidified contents to the container walls and permit the latter to be stripped readily and cleanly from the solidified contents, and which is simple to make and is relatively inexpensive. My composition has other advantages which will be made apparent from the following description of my invention. In this description reference will be made only to the use of the invention as a barrier lining for cartons or drums for storing or shipping asphalt, but it is to be understood that containers lined with the barrier coating of my invention may be used for storing or shipping materials such as bitumens, resins, Waxes and like materials which are liquid when hot and solid when cooled.

The barrier lining or coating composition of my invention comprises an aqueous wax emulsion containing a thickener which also functions as an additional emulsifying agent for the composition, a, material which makes the coating slick and smooth and reduces the penetration of the composition into the fibrous walls of the container when the hot asphalt is poured into it, and a plasticizer which functions to prevent cracking of the coating during drying or bending of the container or of the coated sheets which are to be formed into the container. A preferred composition in accordance with my invention comprises an aqueous wax emulsion in homogeneous admixture with bentonite, graphite and a plasticizer, The preferred plasticizer is a non-crystallizing commercial solution (syrup) of sorbitol sold by Atlas Powder Company under the name Arlex. This composition when made up in accordance with my invention is, preferably, in pasty form and may be spread with a roll or doctor blade upon a sheet of fibrous material which is to be formed into the carton or drum, although it may 5 be applied by a spraying operation. In the latter case, thinning of the composition with water, for example, may be necessary. Regardless of the manner of applying the composition to the fibrous sheet, it adheres to the sheet and the coating is slick and smooth and free from holes or other breaks which would permit the hotasphalt to contact the walls of the container and adhere thereto.

The following is an example of the preferred composition in accordance with my invention and of the method of making it. It being understood that the proportions of the ingredients as well as other details may be varied without departing from the invention claimed in the appended claims.

15 lbs. of bentonite are mixed with 12 gals. of water in a suitable container and allowed to stand for about 12 to 24 hours to permit the mixture to become homogeneous and. smooth. In general,

the longer this mixture stands the more homogeneous and smooth it becomes.

lbs. of parafiin wax and 2 lbs. of oleic acid are heated to about 160 F. to form a homogeneous mixture and lbs. of water and 1 lb. of triethanolamine are mixed and heated to about 160 F. The two mixtures are mixed hot, thereby effecting a reaction between the oleic acidandthe triethanolamine to form an emulsifying agent which serves to maintain the dispersed particles of wax in stable emulsion form throughout the resulting emulsion.

To form the barrier lining or coating composi-v tion of my invention, the wax emulsion is permitted to cool to about 80 to 90 F. and lbs. thereof are then thoroughly mixed with 55 lbs. of the bentonite-Water mixture. The mixing may be effected in any suitable container, preferably one provided with mechanical agitating devices. After the wax emulsion and the bentonitewater mixture have been mixed, 7 /2, lbs. of water, 2 1bs.,of graphite and 3% lbs. of Arlex are added and the ingredients are thoroughly mixed. The resulting mixture is a homogeneous, pasty mass which remains stable for reasonably long periods of time. It may *be applied readily to the fiber sheet to be formed into the drum or directly to the walls of a drum by spreading with a doctor blade or other device in accordance with conventional procedures. The coating is slick and smooth and adheres to the fibrous material, and there is very little penetration of the coating into the fibers.

When hot asphalt is poured into a container lined with the composition of my invention and strikes the coating it causes all or most of the Wax constituent thereof to be driven therefrom into the fibrous wall, leaving the other solids at the surface to act as a barrier between the. as-- phalt and the container wall, thereby preventing adherence of the asphalt to the container wall.

Since the original adhering constituent of the composition of my invention. is driven. from the composition into the wall of the container, the

residual coating is essentially of a non-adherent character and permits the ready removal, as by stripping, of the container from the solidified asphalt. The stripping of the container is clean because the coating effectively prevents direct contact of the asphalt with the walls of the container at all times. 1

While Arlex is the preferred plasticizeror flexibilizer in accordance with my invention, other conventional aqueous-soluble or aqueousmiscible plasticizers of the hygroscopic type such as glycerine and the like may be used. The bentonite is preferred because it serves not only to thicken the composition but to assist in maintaining it in homogeneous form. Kaolin may be 'used in lieu of the bentonite, but it. is not as effective and requires considerably larger proportions' of this material than of the bentonite. Talc, soapstone or other similar materials may be used in lieu of the graphite. As for the wax emulsion, other waxes such as beeswax and other conventional emulsifying agents may be used. Also, if desired, any wax emulsion, regardless of the manner of making it, may be used in lieu of the wax emulsion of my preferred example, the only limitation upon such emulsion being that the wax constituent be capable of functioning in the same manner as the paraflln wax of the preferred example.

The proportions of the ingredients of the coating. composition of my invention may be varied rather widely as will be readily' apparent to a skilled worker in the art; however, the best re;- sults are secured with the ingredients of the pre ferred example in the proportions there set forthl.

I claim:

1. A. coating composition adapted particularly for lining fiber containers to prevent the sticking thereto of asphaltand the like when the same is poured hot into the container and permitted to cool, said composition consisting essentially of water, dispersed particles of wax, bentonite and graphite, and a plasticizer of the hygroscopic type, .saidzconstituents. being in. homogeneous; admixture and being present in proportions-to provide a pasty, spreadable mass, with the bentomte. present therein in. substantially greater proportime than the graphite and: thewaxin suhstane tially the same proportions; as the bentonite, the said bentonite and graphite serving. as; the har ri-er constituents. y

2-. The coating; compositionset ffii'thlin claim 1 wherein the: wax paramn wax- 3. The. coating composition. set. forthinclai m 1 wherein the plasticizer is :sorbitol.

4. The. coating composition set forth in, claim 1. wherein the plasticizer is glycerine.

51 A fibrous container wall lined with .anade herent, pasw coatingv consisting essentially of a homogeneous. mixture of bentonite, wax, graphite, water and a plasticizerof. the hygroscopic type, the said, constituents being present in proportions to provide the; aforesaid. mating; with the.

bentonite present therein. substantially greaterproportions. than the graphite and the. waxin. substantially the some proportions as thebentonite.

e. The fibrous container wall at claim a wherein the wax in the coating paraflin: Wall.

7. The fibrous container wall of 52 wherein the plasticizer in the coating is sorbitnL '8. The fibrous. container wall of 5 wherein the plasticizer in the coating is gl'yoerine.

RUDOLPH M.

REFERENCES CITED The following references are of record in the file of this patent:

Q STATES PATENTS