US2967781A - Wax coating composition and paperboard coated therewith - Google Patents

Wax coating composition and paperboard coated therewith Download PDF

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US2967781A
US2967781A US844864A US84486459A US2967781A US 2967781 A US2967781 A US 2967781A US 844864 A US844864 A US 844864A US 84486459 A US84486459 A US 84486459A US 2967781 A US2967781 A US 2967781A
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wax
melting point
weight percent
fischer
ranging
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Eugene A Jakaitis
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Atlantic Richfield Co
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Atlantic Refining Co
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/18—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising waxes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D191/00—Coating compositions based on oils, fats or waxes; Coating compositions based on derivatives thereof
    • C09D191/06—Waxes
    • C09D191/08—Mineral waxes

Definitions

  • Such wax coated paperboard is particularly useful in the manufacture of food cartons and milk containers. Since parafiin wax lacks the tensile strength and flexibility characteristics required for a paperboard coating composition, polyethylene in small amounts has been added to the wax to improve these properties.
  • the waxes suitable for coating milk cartons require additional properties in order that they will coat the car-ton uniformly and the finished cartons will have a long shelf life when filled with milk. It has been found that if thicker wax coatings are applied, longer shelf lives can be obtained, such coatings, however, are usually not uniform and tend to flake from the paperboard. This tendency increases as the load of wax on the paperboard increases and, in addition, the material cost of waxing the paperboard increases as the wax load increases.
  • a wax composition comprising a major amount of paraffin wax modified by the addition of small amounts of polyethylene, a microcrystalline wax, and a high melting point synthetic Fischer-Tropsch wax may be utilized at low wax loads to coat paperboard, particularly milk cartons, to provide a uniformly coated carton having an exceedingly long shelf life.
  • the major componentof the wax composition of the instant invention comprises parafiin wax, i.e., the normal and isoparaffin hydrocarbon waxes derived from pctroleum crude oils melting within the range of from about 110 F. to about 140 F.
  • parafiin wax i.e., the normal and isoparaffin hydrocarbon waxes derived from pctroleum crude oils melting within the range of from about 110 F. to about 140 F.
  • paraffin waxes usually predominate in normal parafiins and ordinarily consist of a mixture of hydrocarbons differing only slightly in .structure and molecular weight. They are obtained from waxy lubricating oils by well-known dewaxing procedures, generally by the use of dewaxing solvents.
  • Paraffin waxes are characterized by their melting points and those suitable for use in this invention have melting points ranging from F. to 140 F. and those preferred have melting points ranging from F. to F.
  • the second essential component of the instant wax composition comprises a solid polymer of ethylene, in particular, polyethylene having an average molecular weight of between about 10,000 and 14,000 (Staudinger method).
  • polyethylene having an average molecular weight of between about 10,000 and 14,000 (Staudinger method).
  • the polyethylene should have a molecular weight of about 12,000. Y
  • the third essential component of the instant wax composition is a microcrystalline wax, sometimes designated as amorphous or petrolatum wax, such as that prepared by the solvent dewaxing and deoiling of Mid-Continent petroleum residuum stocks.
  • the microcrystalline waxes preferred for the wax compositions of this invention are those having a melting point within the range from F. to F., a viscosity of from 80 to 90 Saybolt seconds Universal at 210 R, an oil content of not more than about 1.5 percent and a penetration at 77 F. of
  • the fourth essential component of the wax composition of this invention consists of a synthetic Fisher- Tropsch wax.
  • Fischer-Tropsch waxes which in recent years have become available in commercial quantities are produced by the well-known reaction of carbon monoxide with hydrogen.
  • the waxes so produced are characterized by the fact that they contain very high percentage of normal paraffius, generally of the order of 90 percent or more.
  • the remainder of such waxes are composed of slightly branched chain hydrocarbons and trace amounts of unsaturated compounds and oxygenated compounds.
  • the synthetic Fischer-Tropsch waxes suitable for use in the instant compositions are those of high melting point ranging from 215 F. to 230 F. and preferably from 220 F. to 225 F.
  • the quantity of each component used to modify the paraffin wax is exceedingly critical in order to obtain the objectives of the invention.
  • the quantity of polyethylene should range from 0.3 to 1.0 weight percent based on the weight of the finished composition
  • this microcrystalline wax should range from 2.0 to 4.0 weight percent based on the weight of the final composition
  • the microcrystalline wax should amount to about 3.0 percent
  • the Fischer-Tropsch wax should range from 1.0 to 2.0 weight percent based on the weight of the final composition.
  • the paraffin wax may range from 93.0 to 96.7 weight percent and preferably from 94.0 to 95.7 weight percent.
  • compositions of this invention are easily prepared. Parafiin wax is melted and the microcrystalline wax added thereto with vigorous agitation. This mixture is then heated to a temperature of approximately 240 F. and the polyethylene and the Fischer-Tropsch wax added with additional vigorous agitation.
  • the final coating composition may be utilized for coating paperboard at coating temperatures of preferably F.
  • a Model E Pure-Pak machine which takes carton blanks, forms them into cartons, waxes the cartons, fills the cartons with milk and seals the cartons in successive steps was utilized in these tests.
  • the paperboard utilized was milk carton stock, 0.16 inch in thickneSSQhaV ing 250-second Gurley densometer porosity.
  • the ma chine was operated in the normal way with the coating being carried out at 170 F. except that the cartons were not .filled with milk.
  • the. wax loads ob Patented Jan. 10, 1961 tained were solely dependent upon the wax being employed.
  • a predetermined number of cartons was weighed before and after waxing.
  • the diflference in weight was determined for the number of cartons utilized in the test and the wax load expressed in pounds per 1000 cartons. Thus, if cartons were utilized in the test the diiference in weight before and after waxing would be multiplied by 100 in order to obtain the wax load in pounds per 1000 cartons.
  • a waxed carton was filled with an aqueous solution of methylene blue, 0.1 percent by weight and the solution allowed to stand in the carton for 10 minutes at room temperature (73 F.). The solution was then poured from the carton and the carton opened and fiattened. Wherever the wax had failed to coat the paper, a blue stain appeared. The total area stained was measured with a grid ruled in squares measuring 0.25 centimeter on each side. The total area stained in terms of the number of such squares was reported as the staining number. Thus, the higher numbers indicate poor uniformity whereas low numbers correspond to a more uniform coating.
  • the shelf life of the waxed cartons was measured by filling the carton with a 1.0 percent aqueous solution of lactic acid also containing 0.1 percent methylene blue and allowing the filled cartons to stand at room temperature (73 F.). The cartons were inspected twice daily to note the development of leaks. The number of hours required for a leak to develop was reported as the shelf life of the carton. The methylene blue, of course, facilitated the detection of the leaks. It was found that the lactic acid solution simulated aged milk and therefore correlated very well with actual shelf life of cartons containing milk.
  • the parafiin wax utilized in these examples had a melting point of 124 F. according to ASTM Method D-87 and an oil content of 0.8 percent according to ASTM Method D-721.
  • the polyethylene employed had a molecular weight of 12,000.
  • the microcrystalline wax had a melting point (drop) of 146 F. according to the ASTM Method D-127, an oil content of 1.5 percent as measured by ASTM Method D-721, a viscosity of 87 Saybolt second Universal at 210 F. and a penetration at 77 F. of 26.2 asmeasured by ASTM Method D- 1321.
  • the synthetic Fischer-Tropsch wax was a commercial material sold under the trade name Parafiint and had a capillary melting ,point of 221 F., a solidification point (rotating thermometer) of from 208.4 to 215.6 F., a drop melting point of about 230 F., a penetration at 77 F. of less than 1, an iodine number of from 3 to 5, an acid number of 0.0, a saponification number of 0.0, and a hydroxyl number of 0.0.
  • compositions which were prepared and tested together with the results of the performance tests carried out thereon are set forth in Table I.
  • Example 3 shows that the composition of Example 2 may 'be improved by the addition of the Fischer-Tropsch wax as far as the uniformity is concerned, but the load is increased.
  • Example 4 shows that the shelf life of the composition of Example 2 may be improved by the addition of microcrystalline wax, but the load is materially increased and the coating again becomes rather non-uniform.
  • Example 5 shows the necessity-of employing all three of the paralfin wax moditiers. This composition has a low load level, is uniform and has a superior shelf life.
  • a high melting point microcrystalline wax was substituted for the Fischer-Tropsch wax in the composition of Example 5.
  • This microcrystalline wax was a commercial product having a melting point of approximately 185 F.
  • the paraffin wax, polyethylene, and lower melting point microcrystalline wax were the same as those employed in Example 5 and in the same amounts.
  • the amount of high melting point microcrystalline wax employed was 1.5 percent by weight, i.e. the same as that of the Fischer-Tropsch wax in Example 5.
  • the results of the tests on this composition are shown under Example 6 in Table II.
  • Example 7 In another experiment the highest melting point petroleum paraiiin wax available commercially, melting point 163.4 F., was substituted for the Fischer-Tropsch wax of Example 5.
  • This composition designated Example 7 in Table II employed the same paraflin wax base material, polyethylene and microcrystalline wax of Example 5 and in the same amounts as in Example 5.
  • the high melting point parafiin wax was used in the amount of 1.5 percent by weight, the amount of the Fischer-Tropsch wax in Example 5.
  • a wax coating composition for paperboard consisting essentially of from 93.0 to 96.7 weight percent of a paraffin wax having a melting point ranging from F. to -F., from 0.3 to 1.0 weight percent of polyethylene having an average molecular weight ranging from 10,000 .to 14,000, from 2.0 to 4.0 weight percent of a microcrystalline wax having a melting point ranging from 145 F. to 160 F., and from 1.0 to 2.0 weight percent of a Fischer-Tropsch wax having a melting point ranging from 215 F. to 230 F.
  • a wax coating composition for paperboard consisting essentially of from 93.0 to 96.7 weight percent of a paralfin wax having a melting point ranging from 120 F. to 125 F., from 0.3 to 1.0 weight percent of polyethylene having an average molecular weight ranging from 10,000 to 14,000, from 2.0 to 4.0 weight percent of a microcrystalline wax having a melting point ranging from about 145 F. to 160 F., and from 1.0 to 2.0 weight percent of a Fischer-Tropsch wax having a melting point ranging from 220 F. to 225 F.
  • a wax coating composition for paperboard consisting essentially of from 94.0 to 95.7 weight percent of a parafiin wax having a melting point ranging from 110 F. to 140 F., from 0.3 to 1.0 weight percent of polyethylene having an average molecular weight ranging from 10,000 to 14,000, about 3.0 weight percent of a microcrystalline wax having a molecular weight ranging from 145 F. to 160 F. and from 1.0 to 2.0 weight percent of a Fischer- Tropsch wax having a melting point ranging from 215 F. to 230 F.
  • a wax coating composition for paperboard consisting essentially of 94.0 to 95 .7 weight percent of a paraffin wax having a melting point ranging from 120 F. to 125 F., from 0.3 to 1.0 weight percent of polyethylene having an average molecular weight ranging from 10,000 to 14,000, about 3.0 percent by weight of a microcrystalline wax having a molecular weight ranging from 145 F. to 160 F. and from 1.0 to 2.0 weight percent of a Fischer- 'Iropsch wax having a melting point ranging from 220 F. to 225 F.
  • a wax coating composition for paperboard consisting essentially of 94.0 to 95.7 weight percent of a paratfin wax having a melting point ranging from 120 F. to
  • Paperboard having a wax coating consisting essentially of from 93.0 to 96.7 weight percent of a paraflin wax having a melting point ranging from F. to F., from 0.3 to 1.0 weight percent of polyethylene having an average molecular weight ranging from 10,000 to 14,000, from 2.0 to 4.0 weight percent of a microcrystalline wax having a melting point ranging from about F. to F. and from 1.0 to 2.0 weight percent of a Fischer- Tropsch wax having a melting point ranging from 220 F. to 225 F.

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Description

United States Patent WAX COATING COMPOSITION AND PAPER- BOARD COATED THEREWITH Eugene A. Jakaitis, Morton, Pa., assignor to The Atlantic Refining Company, Philadelphia, Pa., a corporation of Pennsylvania No Drawing. Filed Oct. 7,1959, Ser. No. 844,864
7 Claims. (Cl. 106-270) such materials. Such wax coated paperboard is particularly useful in the manufacture of food cartons and milk containers. Since parafiin wax lacks the tensile strength and flexibility characteristics required for a paperboard coating composition, polyethylene in small amounts has been added to the wax to improve these properties. The waxes suitable for coating milk cartons, however, require additional properties in order that they will coat the car-ton uniformly and the finished cartons will have a long shelf life when filled with milk. It has been found that if thicker wax coatings are applied, longer shelf lives can be obtained, such coatings, however, are usually not uniform and tend to flake from the paperboard. This tendency increases as the load of wax on the paperboard increases and, in addition, the material cost of waxing the paperboard increases as the wax load increases.
A wax composition now has been found wherein a paraffin wax-polyethylene composition is modified by the addition of small amounts of a microcrystalline wax and a high melting point synthetic Fischer-Tropsch wax to produce a wax composition which, when utilized to coat paperboard, provides superior performance characteristies at low wax loads.
It is an object therefore of this invention to provide an improved wax coating composition.
It is another object of this invention to provide paperboard coated with an improved wax coating composition.
It is another object of this invention to provide a wax coating composition possessing superior performance characteristics at low load levels.
Other objects of this invention will be apparent from the following description of the invention and the claims.
In accordance with the present invention, a wax composition comprising a major amount of paraffin wax modified by the addition of small amounts of polyethylene, a microcrystalline wax, and a high melting point synthetic Fischer-Tropsch wax may be utilized at low wax loads to coat paperboard, particularly milk cartons, to provide a uniformly coated carton having an exceedingly long shelf life.
The major componentof the wax composition of the instant invention comprises parafiin wax, i.e., the normal and isoparaffin hydrocarbon waxes derived from pctroleum crude oils melting within the range of from about 110 F. to about 140 F. These paraffin waxes usually predominate in normal parafiins and ordinarily consist of a mixture of hydrocarbons differing only slightly in .structure and molecular weight. They are obtained from waxy lubricating oils by well-known dewaxing procedures, generally by the use of dewaxing solvents. Paraffin waxes are characterized by their melting points and those suitable for use in this invention have melting points ranging from F. to 140 F. and those preferred have melting points ranging from F. to F.
The second essential component of the instant wax composition comprises a solid polymer of ethylene, in particular, polyethylene having an average molecular weight of between about 10,000 and 14,000 (Staudinger method). Preferably the polyethylene should have a molecular weight of about 12,000. Y
The third essential component of the instant wax composition is a microcrystalline wax, sometimes designated as amorphous or petrolatum wax, such as that prepared by the solvent dewaxing and deoiling of Mid-Continent petroleum residuum stocks. The microcrystalline waxes preferred for the wax compositions of this invention are those having a melting point within the range from F. to F., a viscosity of from 80 to 90 Saybolt seconds Universal at 210 R, an oil content of not more than about 1.5 percent and a penetration at 77 F. of
from about 23 to 30.
The fourth essential component of the wax composition of this invention consists of a synthetic Fisher- Tropsch wax. Fischer-Tropsch waxes which in recent years have become available in commercial quantities are produced by the well-known reaction of carbon monoxide with hydrogen. The waxes so produced are characterized by the fact that they contain very high percentage of normal paraffius, generally of the order of 90 percent or more. The remainder of such waxes are composed of slightly branched chain hydrocarbons and trace amounts of unsaturated compounds and oxygenated compounds. The synthetic Fischer-Tropsch waxes suitable for use in the instant compositions are those of high melting point ranging from 215 F. to 230 F. and preferably from 220 F. to 225 F.
It has been found that the quantity of each component used to modify the paraffin wax is exceedingly critical in order to obtain the objectives of the invention. Thus, the quantity of polyethylene should range from 0.3 to 1.0 weight percent based on the weight of the finished composition, this microcrystalline wax should range from 2.0 to 4.0 weight percent based on the weight of the final composition, preferably the microcrystalline wax should amount to about 3.0 percent, and the Fischer-Tropsch wax should range from 1.0 to 2.0 weight percent based on the weight of the final composition. Thus the paraffin wax may range from 93.0 to 96.7 weight percent and preferably from 94.0 to 95.7 weight percent.
The compositions of this invention are easily prepared. Parafiin wax is melted and the microcrystalline wax added thereto with vigorous agitation. This mixture is then heated to a temperature of approximately 240 F. and the polyethylene and the Fischer-Tropsch wax added with additional vigorous agitation. The final coating composition may be utilized for coating paperboard at coating temperatures of preferably F.
In order to demonstrate the utility of the wax coating compositions of this invention as well as the criticality of each of the components and the amounts thereof, a large number of compositions were prepared and utilized to coat milk cartons according to a standard method and thereafter the coated cartons were subjected to certain performance tests.
A Model E Pure-Pak machine which takes carton blanks, forms them into cartons, waxes the cartons, fills the cartons with milk and seals the cartons in successive steps was utilized in these tests. The paperboard utilized was milk carton stock, 0.16 inch in thickneSSQhaV ing 250-second Gurley densometer porosity. The ma chine was operated in the normal way with the coating being carried out at 170 F. except that the cartons were not .filled with milk. Thus, the. wax loads ob Patented Jan. 10, 1961 tained were solely dependent upon the wax being employed. In order to determine the amount of wax load on the cartons a predetermined number of cartons was weighed before and after waxing. The diflference in weight was determined for the number of cartons utilized in the test and the wax load expressed in pounds per 1000 cartons. Thus, if cartons were utilized in the test the diiference in weight before and after waxing would be multiplied by 100 in order to obtain the wax load in pounds per 1000 cartons.
In order to determine the uniformity of the wax coating, a waxed carton was filled with an aqueous solution of methylene blue, 0.1 percent by weight and the solution allowed to stand in the carton for 10 minutes at room temperature (73 F.). The solution was then poured from the carton and the carton opened and fiattened. Wherever the wax had failed to coat the paper, a blue stain appeared. The total area stained was measured with a grid ruled in squares measuring 0.25 centimeter on each side. The total area stained in terms of the number of such squares was reported as the staining number. Thus, the higher numbers indicate poor uniformity whereas low numbers correspond to a more uniform coating.
The shelf life of the waxed cartons was measured by filling the carton with a 1.0 percent aqueous solution of lactic acid also containing 0.1 percent methylene blue and allowing the filled cartons to stand at room temperature (73 F.). The cartons were inspected twice daily to note the development of leaks. The number of hours required for a leak to develop was reported as the shelf life of the carton. The methylene blue, of course, facilitated the detection of the leaks. It was found that the lactic acid solution simulated aged milk and therefore correlated very well with actual shelf life of cartons containing milk.
The parafiin wax utilized in these examples had a melting point of 124 F. according to ASTM Method D-87 and an oil content of 0.8 percent according to ASTM Method D-721. The polyethylene employed had a molecular weight of 12,000. The microcrystalline wax had a melting point (drop) of 146 F. according to the ASTM Method D-127, an oil content of 1.5 percent as measured by ASTM Method D-721, a viscosity of 87 Saybolt second Universal at 210 F. and a penetration at 77 F. of 26.2 asmeasured by ASTM Method D- 1321.
The synthetic Fischer-Tropsch wax was a commercial material sold under the trade name Parafiint and had a capillary melting ,point of 221 F., a solidification point (rotating thermometer) of from 208.4 to 215.6 F., a drop melting point of about 230 F., a penetration at 77 F. of less than 1, an iodine number of from 3 to 5, an acid number of 0.0, a saponification number of 0.0, and a hydroxyl number of 0.0.
The compositions which were prepared and tested together with the results of the performance tests carried out thereon are set forth in Table I.
It .will be seen from these data that the paraffin wax alone ggives a high load and short shelf life whereas if the paraffin wax is modified with polyethylene the wax load is decreased to a satisfactory level, but the shelf life is not increased to a satisfactory degree and the coating is rather non-uniform as shown by the high staining number. Example 3 shows that the composition of Example 2 may 'be improved by the addition of the Fischer-Tropsch wax as far as the uniformity is concerned, but the load is increased. Example 4 shows that the shelf life of the composition of Example 2 may be improved by the addition of microcrystalline wax, but the load is materially increased and the coating again becomes rather non-uniform. Example 5 shows the necessity-of employing all three of the paralfin wax moditiers. This composition has a low load level, is uniform and has a superior shelf life.
In order to demonstrate the criticality of employing the high melting point Fischer-Tropsch wax in the composition of this invention, a high melting point microcrystalline wax was substituted for the Fischer-Tropsch wax in the composition of Example 5. This microcrystalline wax was a commercial product having a melting point of approximately 185 F. The paraffin wax, polyethylene, and lower melting point microcrystalline wax were the same as those employed in Example 5 and in the same amounts. The amount of high melting point microcrystalline wax employed was 1.5 percent by weight, i.e. the same as that of the Fischer-Tropsch wax in Example 5. The results of the tests on this composition are shown under Example 6 in Table II.
In another experiment the highest melting point petroleum paraiiin wax available commercially, melting point 163.4 F., was substituted for the Fischer-Tropsch wax of Example 5. This composition designated Example 7 in Table II, employed the same paraflin wax base material, polyethylene and microcrystalline wax of Example 5 and in the same amounts as in Example 5. Likewise the high melting point parafiin wax was used in the amount of 1.5 percent by weight, the amount of the Fischer-Tropsch wax in Example 5.
Table II Wax Load, Shelf Life, Example No. Pounds Staining Hours at For 1,000 Number 73 F.
Cartons These results show that neither a high melting point microcrystalline wax nor a high melting point petroleum paraflin wax can be substituted for the Fischer-Tropsch wax of this invention.
A large series of experiments were carried out in which the molecular weight and concentration of the polyethyl one were varied and the wax load determined for each composition. From the correlation curves obtained it was determined that in order to obtain a wax load not greater than 32.5 pounds per 1000 cartons the average molecular weight of the polyethylene should range from 10,000 to 14,000 molecular weight (Staudinger method), preferably about 12,000, and the concentration should range from 0.3 to 1.0 Weight percent based on the weight of the final composition. The concentration ranges of the microcrystalline wax (2.0 to 4.0 weight percent, about 3.0 percent preferred) and Fischer-Tropsch wax (1.0 to 2.0 weight percent) were determined from similar test data.
I claim:
1. A wax coating composition for paperboard consisting essentially of from 93.0 to 96.7 weight percent of a paraffin wax having a melting point ranging from F. to -F., from 0.3 to 1.0 weight percent of polyethylene having an average molecular weight ranging from 10,000 .to 14,000, from 2.0 to 4.0 weight percent of a microcrystalline wax having a melting point ranging from 145 F. to 160 F., and from 1.0 to 2.0 weight percent of a Fischer-Tropsch wax having a melting point ranging from 215 F. to 230 F.
2. A wax coating composition for paperboard consisting essentially of from 93.0 to 96.7 weight percent of a paralfin wax having a melting point ranging from 120 F. to 125 F., from 0.3 to 1.0 weight percent of polyethylene having an average molecular weight ranging from 10,000 to 14,000, from 2.0 to 4.0 weight percent of a microcrystalline wax having a melting point ranging from about 145 F. to 160 F., and from 1.0 to 2.0 weight percent of a Fischer-Tropsch wax having a melting point ranging from 220 F. to 225 F.
3. A wax coating composition for paperboard consisting essentially of from 94.0 to 95.7 weight percent of a parafiin wax having a melting point ranging from 110 F. to 140 F., from 0.3 to 1.0 weight percent of polyethylene having an average molecular weight ranging from 10,000 to 14,000, about 3.0 weight percent of a microcrystalline wax having a molecular weight ranging from 145 F. to 160 F. and from 1.0 to 2.0 weight percent of a Fischer- Tropsch wax having a melting point ranging from 215 F. to 230 F.
4. A wax coating composition for paperboard consisting essentially of 94.0 to 95 .7 weight percent of a paraffin wax having a melting point ranging from 120 F. to 125 F., from 0.3 to 1.0 weight percent of polyethylene having an average molecular weight ranging from 10,000 to 14,000, about 3.0 percent by weight of a microcrystalline wax having a molecular weight ranging from 145 F. to 160 F. and from 1.0 to 2.0 weight percent of a Fischer- 'Iropsch wax having a melting point ranging from 220 F. to 225 F.
5. A wax coating composition for paperboard consisting essentially of 94.0 to 95.7 weight percent of a paratfin wax having a melting point ranging from 120 F. to
125 F., from 0.3 to 1.0 weight percent of polyethylene having an average molecular weight of about 12,000,
about 3.0 weight percent of a microcrystalline wax having a molecular weight ranging from 145 F. to 160 F.
and from 1.0 to 2.0 weight percent of a Fischer-Tropsch to 14,000, from 2.0 to 4.0 weight percent of a microcrys-' talline wax having a melting point ranging from 145 F. to 160 F. and from 1.0 to 2.0 weight percent of a Fischer-Tropsch wax having a melting point ranging from 215 F. to 230 F.
7. Paperboard having a wax coating consisting essentially of from 93.0 to 96.7 weight percent of a paraflin wax having a melting point ranging from F. to F., from 0.3 to 1.0 weight percent of polyethylene having an average molecular weight ranging from 10,000 to 14,000, from 2.0 to 4.0 weight percent of a microcrystalline wax having a melting point ranging from about F. to F. and from 1.0 to 2.0 weight percent of a Fischer- Tropsch wax having a melting point ranging from 220 F. to 225 F.
References Cited in the file of this patent UNITED STATES PATENTS 2,731,370 Tramm Ian. 17, 1956 2,733,225 Smith Jan. 31, 1956 2,773,045 Simerl Dec. 4, 1956 2,810,678 Eflron Oct. 22,1957 2,816,845 Capell Dec. 17, 1957 2,857,350 Thompson Oct. 21, 1958 2,867,596 Bennett Jan. 6, 1959 UNITED STATES PATENT OFFICE CERTIFICATION OF CORRECTION Patent No. 2,967,781 January 10, 1961 Eugene A. Jakaitis that error appears in the above numbered pat- It is h'ereby certified that the said Letters Patent should read as ent requiring correction and corrected below.
Column 1, line 19, for "coacting" read coating column 2, line 22, for "Fisher" read Fischer column 3, line 45, for "second read Seconds 1(sEAL) Attest:
DAVID L. LADD Commissioner of Patents ERNEST W. SWIDER Attesting Officer

Claims (1)

1. A WAX COATING COMPOSITION FOR PAPERBOARD CONSISTING ESSENTIALLY OF FROM 93.0 TO 96.7 WEIGHT PERCENT OF A PARAFFIN WAX HAVING A MELTING POINT RANGING FROM 110*F. TO 140*F., FROM 0.3 TO 1.0 WEIGHT PERCENT OF POLYETHLENE HAVING AN AVERAGE MOLECULAR WEIGHT RANGING FROM 10,000 TO 14,000, FROM 2.0 TO 4.0 WEIGHT PERCENT OF A MICROCRYSTALLINE WAX HAVING A MELTING POINT RANGING FROM 145*F. TO 160*F., AND FROM 1.0 TO 2.0 WEIGHT PERCENT OF A FISCHER-TROPSCH WAX HAVING A MELTING POINT RANGING FROM 215*F TO 230*F.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3085026A (en) * 1960-09-28 1963-04-09 Exxon Research Engineering Co Impregnated corrugated paperboard and process of making same
US3102040A (en) * 1960-03-31 1963-08-27 California Research Corp Paraffin wax compositions
US3394096A (en) * 1965-03-11 1968-07-23 Sun Oil Co Wax compositions for impregnating paperboard
WO2016073219A1 (en) 2014-11-03 2016-05-12 Exxonmobil Research And Engineering Company Saturating wax coating composition and associated methods of use

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US2731370A (en) * 1952-05-14 1956-01-17 Ruhrchemie Ag Package coated with paraffin and a polymerized product of a cyclopentadiene
US2733225A (en) * 1956-01-31 P composition sa
US2773045A (en) * 1951-02-20 1956-12-04 Marathon Corp Wax compositions and sheet materials coated therewith
US2810678A (en) * 1954-09-23 1957-10-22 Exxon Research Engineering Co Method of improving storage characteristics of wax and product thereof
US2816845A (en) * 1955-06-13 1957-12-17 Gulf Research Development Co Petroleum wax compositions
US2857350A (en) * 1952-10-15 1958-10-21 Dussek Brothers & Company Ltd Electric cable and condenser insulation including fischer-tropsch wax
US2867596A (en) * 1953-08-13 1959-01-06 Dussek Brothers & Company Ltd Electric cables and condenser insulation including wax and petroleum

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US2733225A (en) * 1956-01-31 P composition sa
US2773045A (en) * 1951-02-20 1956-12-04 Marathon Corp Wax compositions and sheet materials coated therewith
US2731370A (en) * 1952-05-14 1956-01-17 Ruhrchemie Ag Package coated with paraffin and a polymerized product of a cyclopentadiene
US2857350A (en) * 1952-10-15 1958-10-21 Dussek Brothers & Company Ltd Electric cable and condenser insulation including fischer-tropsch wax
US2867596A (en) * 1953-08-13 1959-01-06 Dussek Brothers & Company Ltd Electric cables and condenser insulation including wax and petroleum
US2810678A (en) * 1954-09-23 1957-10-22 Exxon Research Engineering Co Method of improving storage characteristics of wax and product thereof
US2816845A (en) * 1955-06-13 1957-12-17 Gulf Research Development Co Petroleum wax compositions

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3102040A (en) * 1960-03-31 1963-08-27 California Research Corp Paraffin wax compositions
US3085026A (en) * 1960-09-28 1963-04-09 Exxon Research Engineering Co Impregnated corrugated paperboard and process of making same
US3394096A (en) * 1965-03-11 1968-07-23 Sun Oil Co Wax compositions for impregnating paperboard
WO2016073219A1 (en) 2014-11-03 2016-05-12 Exxonmobil Research And Engineering Company Saturating wax coating composition and associated methods of use

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