US2370090A - Moistureproofed kraft paper - Google Patents
Moistureproofed kraft paper Download PDFInfo
- Publication number
- US2370090A US2370090A US41240841A US2370090A US 2370090 A US2370090 A US 2370090A US 41240841 A US41240841 A US 41240841A US 2370090 A US2370090 A US 2370090A
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- United States
- Prior art keywords
- coating
- kraft
- moisture
- super
- paper
- Prior art date
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- Expired - Lifetime
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- 239000002655 kraft paper Substances 0.000 title description 26
- 238000000576 coating method Methods 0.000 description 37
- 239000011248 coating agent Substances 0.000 description 29
- 238000003490 calendering Methods 0.000 description 17
- 239000004922 lacquer Substances 0.000 description 14
- 229920001971 elastomer Polymers 0.000 description 11
- 239000000123 paper Substances 0.000 description 11
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 5
- 229920013620 Pliolite Polymers 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 235000019271 petrolatum Nutrition 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- NGNBDVOYPDDBFK-UHFFFAOYSA-N 2-[2,4-di(pentan-2-yl)phenoxy]acetyl chloride Chemical class CCCC(C)C1=CC=C(OCC(Cl)=O)C(C(C)CCC)=C1 NGNBDVOYPDDBFK-UHFFFAOYSA-N 0.000 description 1
- IULJSGIJJZZUMF-UHFFFAOYSA-N 2-hydroxybenzenesulfonic acid Chemical class OC1=CC=CC=C1S(O)(=O)=O IULJSGIJJZZUMF-UHFFFAOYSA-N 0.000 description 1
- QTWJRLJHJPIABL-UHFFFAOYSA-N 2-methylphenol;3-methylphenol;4-methylphenol Chemical compound CC1=CC=C(O)C=C1.CC1=CC=CC(O)=C1.CC1=CC=CC=C1O QTWJRLJHJPIABL-UHFFFAOYSA-N 0.000 description 1
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- PYGXAGIECVVIOZ-UHFFFAOYSA-N Dibutyl decanedioate Chemical compound CCCCOC(=O)CCCCCCCCC(=O)OCCCC PYGXAGIECVVIOZ-UHFFFAOYSA-N 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- XCWPUUGSGHNIDZ-UHFFFAOYSA-N Oxypertine Chemical compound C1=2C=C(OC)C(OC)=CC=2NC(C)=C1CCN(CC1)CCN1C1=CC=CC=C1 XCWPUUGSGHNIDZ-UHFFFAOYSA-N 0.000 description 1
- 229930040373 Paraformaldehyde Natural products 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- YSMRWXYRXBRSND-UHFFFAOYSA-N TOTP Chemical compound CC1=CC=CC=C1OP(=O)(OC=1C(=CC=CC=1)C)OC1=CC=CC=C1C YSMRWXYRXBRSND-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229910021627 Tin(IV) chloride Inorganic materials 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000001175 calcium sulphate Substances 0.000 description 1
- 235000011132 calcium sulphate Nutrition 0.000 description 1
- 239000004359 castor oil Substances 0.000 description 1
- 235000019438 castor oil Nutrition 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229930003836 cresol Natural products 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000011086 glassine Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 235000010985 glycerol esters of wood rosin Nutrition 0.000 description 1
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920002866 paraformaldehyde Polymers 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920001281 polyalkylene Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 150000003505 terpenes Chemical class 0.000 description 1
- 235000007586 terpenes Nutrition 0.000 description 1
- FAGUFWYHJQFNRV-UHFFFAOYSA-N tetraethylenepentamine Chemical compound NCCNCCNCCNCCN FAGUFWYHJQFNRV-UHFFFAOYSA-N 0.000 description 1
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000003871 white petrolatum Substances 0.000 description 1
Images
Classifications
-
- 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
- D21H19/72—Coated paper characterised by the paper substrate
- D21H19/76—Coated paper characterised by the paper substrate the substrate having specific absorbent properties
- D21H19/78—Coated paper characterised by the paper substrate the substrate having specific absorbent properties being substantially impervious to the coating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31826—Of natural rubber
- Y10T428/31841—Next to cellulosic
Definitions
- kraft paper is super-calendered, i; e., it is passed through a high pressure, hot calender, such as, for example, a calender of the type ordinarilylemployed for glassine paper, and this super-calendered kraft is then coated with a moistureprooflng lacquer.
- a plasticizer such as glycerine, etc. may be added to it to keep its'moisture' content, up.'
- Super-calendered kraft has-such a glaze on its surface that its power of absorbing liquids is "greatly reduced. A few pounds of of moistureproofing lacquer per ream ofpaper will render this type of kraft very resistant tothe passage of water-vapor.
- the paper itself is cheap. nd it can be super-calendered for not more than one cent per pound, and because it can be made'mois tureproof by a very thin coating of lacquer, a low cost moistureproof sheet is obtained which has a wide range of usefulness.
- Molstureproof super-calendered kraft is im- 'mediately replacing more expensive materials and is being used where paper products'have not ping of photographic films, etc. It may be used as a linerfor barrelsand for strawboarcl cartons and for freight cars, etc. It may be used as the inner ply of multiple-ply kraft bags, such as those used for packaging salt, lime, calcium sulphate,
- the degree of distribution of the .flbers is determined by the treatment of the pulp in the beater.
- a kraft in which the fibers are more evenly distributed than in ordinary kraft requires less labquer per ream to' produce any desiredmoisture resistance; and is therefore preferred in making the moisture proof sheet of this invention.
- I weight of the sheet which 'is'lacquered may vary.
- dered kraft may be used.
- Wax alone is unsatisfactory, because it cracks when thepaper is wrinkled or creased. Wax may be usedadvantageously wit a film-forming lacquer, such as a cellulosic prci uct, e. g nitrocellulose; or a rubber derivative, e.
- Marbon B the product manufac tured by the Marbon Corporation of Gary, In-- dlana, which is mad by dissolving rubber-in cresol and treating e solution with hydrogen chloride as described in'McKenzie United States Patent No. 2,230,359; or a cyclized rubber such as one of the moistureprooflng Pliolite compositions sold by.
- the Goodyear Tire I Rubber Company of Akron, Ohio (which may be made by treating rubber with chlorostannic acid or tin tetrachloride as described in Endres United States Patent No.
- a chlorinated rubin the insulation of telephone cables and in wrapbar, such as Parlon, etc., or rubber hydrochloride may be used as the moistureproofing coating.
- - Isolac phenol sulphonic acid derivative of rubber
- a coating of a synthetic material, such as a polyvinyl derivative may be used.
- Other coatings which may be used include ethyl cellulose, etc.
- the sheet is preferably coated on both sides, but may be coated on only one side. For example, three to nine pounds of the coatings of Examples 2, 3 and 4, below, one-half applied to each side of a supercalendered kraft, give a moisture transmission as low as one to six grams.
- the coating is preferably applied as a lacquer, and in driving off the solvent the coating in each instance should be heated to a temperature suflicient to dissolve the wax.
- the accompanying graph shows the relative moistureproofness of ordinary kraft paper and super-calendered kraft to which varying amounts of a moistureproofing lacquer were applied.
- an equal amount of the The moisture-vapor transfer rate of ordinary kraft, uncoated is several thousand grams per square meter in twenty-four hours. It will be noted that the lacquer coating reduces this very appreciably, but due to recentimprovements in technique a moisture-vapor transfer rate of no more than eight grams per square meter per twenty-four hours is now demanded for many uses. Thislow transfer rate cannot be obtained by coating ordinary kraft. The.
- moisture transmission is expressed in grams per square meter per twenty-four hours.
- Example 1 Parts Cyclized'rubber (Pliolite with a distortion point of 55 C.).; l5 Parafiin, 134 F 15 Toluol 70 This formula is designed for use where anon glossy coating is desired.
- This coating heat-seals when heated at about 200250 F.
- This coating heat-seals at 300-400 F.
- a small amount, e. g., 0.75 part of the reaction product of tetraethylene pentamine and formaldehyde (either paraformaldehyde or Formalin) added to the composition of Example 1, 2, 3 or 4with either type of parainn gives a coating which maintains high moisture resistance over a much-longer time than the identical .Pliolite coating which contains no antioxidant or stabilizer. for the cycllzed rubber.
- This particular stabilizer and. related compounds such as other aldehyde and ketone derivatives of polyalkylene polyamines are not afiected by heat and therefore withstand accelerated oven-aging tests as well as giving prolonged life under normal the production of a comparable coating on ordinary ln'aft'.
- Equal amounts -ot'laoquer produce a much more impervious coating on the supercalendered' sheet.
- the moisture-vapor herein are determined by measuring the rate of moisture. transfer between atmospheres of no humidity and one hundred per cent humidity, re-' spectively, at 40 C. for twenty four hours.
- a large number of other materials may be compounded with Pliolite and wax to form satise factory coatings for specific purposes.
- suitable coatings may be made using one to twenty-five per cent :of such resins as ester gum, cumar, polymerized terpenes, cyclohexanone, Aroclorsv and rosin esters added as diluents' or as gloss producers; and such plasticizers as, diarnylnaphthalene, tricresyl phosphate, dibutyl sebacate,.mineral oil, paraflln oil and many similar liquids may be used'ln proportions from one-to twenty per cent for specific purposes.
- All of these solutions may be applied on a conventional type coating machine in which the paper is passed through a tank containing the coating solution, thence over doctor knives or fine the coating to the super-calendered 8H1!- face and being plasticized to keep its moisture I content up.
- a moisture-vapor-proot wrapping material consisting otesuper-caiendered kraft paper ,with
- the paper being super-caiendered to confine the coating to the super-calendered' surface and being piasticized to keep its moisture content up.
- a moisture-vapor prooi wrapping material consisting of super-caiendered kraft paper with, Q a moistureproof lacquer skin coating of cyclized rubber thereon, the paper being'super-calendered to confine the coating to the super-calend'ered surface and being 'piasticized to keep its moisture content up.
Landscapes
- Paper (AREA)
Description
- Feb. '20, 1945. H. R. ms Er AL 2,370,090
Iva/slur: V400)- Wawzmswoa fife Iva/24in:
MOISTUREPROOFED KRAFT PAPER Filed Sept. 26, 1941 0 IJ W Ckramsfi arm/1' Patented Feb. 2c, 1945 ,UNITED STATES PATENT, OFFlCE 2.370.090 MOISTUBEPROOFED 1mm PAPER Herman B. Thies, Kent, and Clarence M. Carson,
Cuyahoga Falls, Ohio, assignors to Wingfoot Ohio, a corporation of Corporation, Akron,
Delaware Application Septemberitli, 1941 SerialNo. 412,408
4 Claims. (01. 111-155) I made by uniting two sheets of kraft paper with a layer of as phalt, but the number of places where such a sheet can be used is limited.
For some time there has been a water-finished kraft on the market, and this has sometimes been referred to as a calendered kraft. Even after this treatment the kraft is so absorbent that it is im- I practical to. coat it with a moistureprooflng lac- According to this invention kraft paper is super-calendered, i; e., it is passed through a high pressure, hot calender, such as, for example, a calender of the type ordinarilylemployed for glassine paper, and this super-calendered kraft is then coated with a moistureprooflng lacquer. Be-
cause such calendering tends toembrittle the paper a plasticizer such as glycerine, etc. may be added to it to keep its'moisture' content, up.'
Super-calendered kraft has-such a glaze on its surface that its power of absorbing liquids is "greatly reduced. A few pounds of of moistureproofing lacquer per ream ofpaper will render this type of kraft very resistant tothe passage of water-vapor. The paper itself is cheap. nd it can be super-calendered for not more than one cent per pound, and because it can be made'mois tureproof by a very thin coating of lacquer, a low cost moistureproof sheet is obtained which has a wide range of usefulness.
Molstureproof super-calendered kraft is im- 'mediately replacing more expensive materials and is being used where paper products'have not ping of photographic films, etc. It may be used as a linerfor barrelsand for strawboarcl cartons and for freight cars, etc. It may be used as the inner ply of multiple-ply kraft bags, such as those used for packaging salt, lime, calcium sulphate,
calcium chloride and other. hydroscopic chemicals etc. It may be used for wrapping automobile or airplane parts for export. .There are numerous possible uses forit where it is desired either to keep moisture ina packaged product or to protect a packaged product from the moisture vapor in theatmosphere.
There are various grades of kraft on the market. Any pf these may be super-calendered and lacquered to form the moisture-proof sheet 0!.
this invention. By holding a sheet of kraft paper to the light it will be observed that in certain of them the fibers are bunched together whereas in others the fibers are more uniformly distributed.
The degree of distribution of the .flbers is determined by the treatment of the pulp in the beater. A kraft in which the fibers are more evenly distributed than in ordinary kraft requires less labquer per ream to' produce any desiredmoisture resistance; and is therefore preferred in making the moisture proof sheet of this invention. the
I weight of the sheet which 'is'lacquered may vary.
. dered kraft may be used.
heretofore been employed, because no moistureproof paper of sufficient strength-was available. The combination of high strength and moisture-' proofness of the type produced by a lacquer coating has not heretofore been available in a paper product. Many uses for this new sheet have 'ala ready beenfound. For example, it may be used where metal foils are now used, as, for example,
For example. it may -be twenty or sixty pounds, more or less, per three-thousand square foot ream. Both bleached and white super-calen- A wide variety of coating materials may be used for moistureprooflng. Wax alone is unsatisfactory, because it cracks when thepaper is wrinkled or creased. Wax may be usedadvantageously wit a film-forming lacquer, such as a cellulosic prci uct, e. g nitrocellulose; or a rubber derivative, e. g., Marbon B, the product manufac tured by the Marbon Corporation of Gary, In-- dlana, which is mad by dissolving rubber-in cresol and treating e solution with hydrogen chloride as described in'McKenzie United States Patent No. 2,230,359; or a cyclized rubber such as one of the moistureprooflng Pliolite compositions sold by. The Goodyear Tire I: Rubber Company of Akron, Ohio (which may be made by treating rubber with chlorostannic acid or tin tetrachloride as described in Endres United States Patent No. 2,052,391) A chlorinated rubin the insulation of telephone cables and in wrapbar, such as Parlon, etc., or rubber hydrochloride may be used as the moistureproofing coating.- Isolac (phenol sulphonic acid derivative of rubber) may be used where its reddish color-is not objectionable. A coating of a synthetic material, such as a polyvinyl derivative may be used. Other coatings which may be used include ethyl cellulose, etc. Although the film-forming materials may be used without wax a more moistureproof product will ordinarily be obtained by compounding wax with the fllm-forming material. Fusible coatings. such as those of high wax content may be applied by the hot-melt method. The invention relates more particularly to the use of non-fusible coatings which must be applied in solution.
The following coating compositions-when applied to a super-calendered kraft in an amount (on the dry basis) of several pounds per ream, not exceeding about ten or twelve pounds per ream and in some cases not over four or five pounds per ream, will give a coated product of very low moisture transmission. The sheet is preferably coated on both sides, but may be coated on only one side. For example, three to nine pounds of the coatings of Examples 2, 3 and 4, below, one-half applied to each side of a supercalendered kraft, give a moisture transmission as low as one to six grams. The coating is preferably applied as a lacquer, and in driving off the solvent the coating in each instance should be heated to a temperature suflicient to dissolve the wax.
The accompanying graph shows the relative moistureproofness of ordinary kraft paper and super-calendered kraft to which varying amounts of a moistureproofing lacquer were applied. In treating both sheets, an equal amount of the The moisture-vapor transfer rate of ordinary kraft, uncoated, is several thousand grams per square meter in twenty-four hours. It will be noted that the lacquer coating reduces this very appreciably, but due to recentimprovements in technique a moisture-vapor transfer rate of no more than eight grams per square meter per twenty-four hours is now demanded for many uses. Thislow transfer rate cannot be obtained by coating ordinary kraft. The. cost of the amount of lacquer required makes such a pro- Cedure unprofitable, and impregnation and coatand this facilitates the formation of a skin coating .of the lacquer on thesur'face of the sheet. By retarding penetration and confining the lacquer coating to the surface of the sheet the super-calendered surface produces a skin coating from much lesslacquer than isrequired for lacquer was applied to each side of the sheet.
moisture transmission is expressed in grams per square meter per twenty-four hours.
The followingexamples are illustrative:
Example 1 Parts Cyclized'rubber (Pliolite with a distortion point of 55 C.).; l5 Parafiin, 134 F 15 Toluol 70 This formula is designed for use where anon glossy coating is desired.
Antioxidant (monobenzyl p a r a a. min 0 phenol) .72 Toluol 79.48
This coating heat-seals when heated at about 200250 F.
Example 4 Parts Partially oxidized cyclized rubber (Pliolite,
P-12'30) 18.7 Parafiin, 134 F 3.3 White petrolatum (petroleum jelly) 1.0
Toluol 77.0
This coating heat-seals at 300-400 F.
All of these formulas may be modified by using any other parafiin than those specified. Using a higher melting point parafiln there is less tendency for the treated paper to stick together in the roll.
A small amount, e. g., 0.75 part of the reaction product of tetraethylene pentamine and formaldehyde (either paraformaldehyde or Formalin) added to the composition of Example 1, 2, 3 or 4with either type of parainn gives a coating which maintains high moisture resistance over a much-longer time than the identical .Pliolite coating which contains no antioxidant or stabilizer. for the cycllzed rubber. This particular stabilizer and. related compounds such as other aldehyde and ketone derivatives of polyalkylene polyamines are not afiected by heat and therefore withstand accelerated oven-aging tests as well as giving prolonged life under normal the production of a comparable coating on ordinary ln'aft'. Equal amounts -ot'laoquer produce a much more impervious coating on the supercalendered' sheet.
The moisture-vapor herein are determined by measuring the rate of moisture. transfer between atmospheres of no humidity and one hundred per cent humidity, re-' spectively, at 40 C. for twenty four hours. The
transmissions specified f aging conditions.
A large number of other materials may be compounded with Pliolite and wax to form satise factory coatings for specific purposes. For instance, suitable coatings may be made using one to twenty-five per cent :of such resins as ester gum, cumar, polymerized terpenes, cyclohexanone, Aroclorsv and rosin esters added as diluents' or as gloss producers; and such plasticizers as, diarnylnaphthalene, tricresyl phosphate, dibutyl sebacate,.mineral oil, paraflln oil and many similar liquids may be used'ln proportions from one-to twenty per cent for specific purposes.
, Pigments, dyes, etc.-may be added to the coatings to produce desired colored eflects, although in'general colorless, transparent coatings will be preferred.
solventfthe kraft being super-calendered to con-4 The same general formulations as in Examples 1 to 4 may be used with the othermoistureproofing resins. With Marbon B or Isolac ten to fifteen per cent 'of paraflin wax may be used. Not over ten per cent of paraflin will ordinarily be used with Parlon.
Example 5- Parts Ethocel (8 cps.) I 10.0 Paraflin Castor oil 1.0 Toluol 57.5 Amy! acetate 30.0
All of these solutions may be applied on a conventional type coating machine in which the paper is passed through a tank containing the coating solution, thence over doctor knives or fine the coating to the super-calendered 8H1!- face and being plasticized to keep its moisture I content up.
2. Super-calendered kraft paper coated with a moisture-proof iacquer coating of cylized rubber, the paper being super caiendered to confine the coating to the super-calendered surface and being plasticized to keep its moisture content up..
3. A moisture-vapor-proot wrapping material consisting otesuper-caiendered kraft paper ,with
a moisture-vapor-proof lacquer skin coating thereon, the paper being super-caiendered to confine the coating to the super-calendered' surface and being piasticized to keep its moisture content up.
- 4. A moisture-vapor prooi wrapping material consisting of super-caiendered kraft paper with, Q a moistureproof lacquer skin coating of cyclized rubber thereon, the paper being'super-calendered to confine the coating to the super-calend'ered surface and being 'piasticized to keep its moisture content up.
' HERMAN R.
CLARENCE M. CARSON.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US41240841 US2370090A (en) | 1941-09-26 | 1941-09-26 | Moistureproofed kraft paper |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US41240841 US2370090A (en) | 1941-09-26 | 1941-09-26 | Moistureproofed kraft paper |
Publications (1)
Publication Number | Publication Date |
---|---|
US2370090A true US2370090A (en) | 1945-02-20 |
Family
ID=23632843
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US41240841 Expired - Lifetime US2370090A (en) | 1941-09-26 | 1941-09-26 | Moistureproofed kraft paper |
Country Status (1)
Country | Link |
---|---|
US (1) | US2370090A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2497712A (en) * | 1944-06-05 | 1950-02-14 | Paper Patents Co | Process of manufacturing a fibrous sheet covered plywood |
US2752085A (en) * | 1949-08-03 | 1956-06-26 | Dixie Wax Paper Company | Paper bags |
-
1941
- 1941-09-26 US US41240841 patent/US2370090A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2497712A (en) * | 1944-06-05 | 1950-02-14 | Paper Patents Co | Process of manufacturing a fibrous sheet covered plywood |
US2752085A (en) * | 1949-08-03 | 1956-06-26 | Dixie Wax Paper Company | Paper bags |
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