US2358831A - Pressure sealing paper tape - Google Patents

Description

' Sept. 26, 1944. G. scHlEMAN PRESSURE SEALING PAPER TAPE Filed March 26, 1942 IVEN'ILOR.. Bygwywe czlewm/p @M ma Patented Sept. 26, 1944 j PRESSURE sEALrNG PAPER TAPE Gustave Schieman, Bronx, N. Y., assignor to International Plastic Corporation, a corporation of Illinois Application March 26, 1942, Serial No. 436,221

8 Claims. (Cl. 117-685) 'I'his invention relates to a paper tape and more particularly to a pressure sealing paper tape.

An object of the present invention is to provide a pressure sealing paper tape which is water and vapor proof.

It is a further object of my invention to provide a paper tape which is resistant to most solvents such as gasoline, naphtha, benzol, and corrosive substances such asalkali solutions, concentrated acetic acid, dilute nitric and dilute hydrochloric acids, etc., and which is fast sealing and adheres aggressively to paper, metals and other surfaces.

The advantages of such a self-sealing water and vapor proof paper tape are tremendous be'- cause of the many iields of its application in use. Many repeated attempts have been made for more than the past twenty years, and a large amount of time and money expended to produce such a tape but without success.

The above and other features, advantages, capabilities will become apparent from a detailed description of the accompanying drawing in which I have illustrated one form of my paper tape structure but the structure there shown is to be understood as illustrative only and not as dening the limits of my invention. It is of course understood that tapes, as initially manufactured are wound in convolute rolls or if cut in sheets, the sheets are superimposed and when desired to use, the roll must be unwound or the sheets separated. It is also generally known that in the tapes heretofore on the market, particularly paper tape, that if when the roll becomes soaked with moisture, as frequently happens in the different places or under the diierent lconditions in which such tapes are used, the unused portion of the roll is rendered worthless, as it is impossible to separate or unwind the roll. However, with my invention it affords a paper tape which will solve this problem, for with mylinproved paper tape, even though it vmay become soaked for a long time in water it can be readily and quickly dried and -used as initially intended, as all of its initial characteristicsnotwithstanding it has thus been soaked in water or moisture,v

are automatically re-established to the fullest extent by merely drying the tape. y Referring to the drawing: Fig. 1 is a perspective of a roll of tape embodying the invention; and

Fig. 2 is a longitudinal sectional enlarged view of the finished tape. a e Referring to the drawing in detail, in the preierred form my composite paper tape is composed of live separate and distinct layers. laminations or sections. The base I0 consists of any suitable paper on the market such as'kraft, rag, glassine or parchment, the particular type of paper being determined to some extent by the use for which the completed tape is intended.I Forexample, if great strength is required a relatively heavy long bred stock is utilized. To one side vof the paper base I apply directly a separator Il. One of the important functions of this separator is to lay the fibres of the craft paper, which generally extend outward from thesurface in the form of fuzz discernible to the naked eye, with a sufficient separator in order that no portion or part of the `adhesive I2, which is subsequently imposed upon the separator will touch or come in contact with the paper. The reasonvfor this is that I have found from long experiments and study that should the paper or any of the bres thereof com'e in contact with an adhesive, the impurities in the various papers on the market, for example, traces of metal, tend to break down certain types of adhesive by catalytic action, as shown by my experiments.

The separator Il comprises lacquers composed of cellulosic derivatives such asnitrocellulose, ethyl cellulose, etc. It may also comprise Varnishes comprised of oleo-resinous materials, synthetic resins such as Vinylite, methacrylate, al- Y kyds, etc. This separator in addition to laying the libres flat, also impregnates the paper rendering it moisture and vapor proof.

After the separator above described has been applied to one side of the craft paper, lamination or section, I apply to the opposite side of the paper a repellent primer I3 in the form of a continuous lm which must be very smooth and glossy and capable of bonding the repellent to it. While my experiments have shown that the same substances suitable for use as a separator may also be'used as a suitable repellent primer, I preferv to use a resilient primer with a very high glossy iinish. Varnishes, alkyds, and lacquers high in oil content afford the desired or preferred coating. The repellent primer is prefere ably less than i-mil thick. One reason for ref stricting therepellent primer coating to such thinness is to permit the airbubbles to beremoved or taken out during the subsequent drying operation presently to be described.

. To the repellent primer coating I next apply y ,y directly thereto a repellent coating or lamination il. This repellent coating or lamination preferably consists of 4 parts of an incompletely hydrolyzed, polyvinyl acetate sold under the trade the paper base all likelihood oi the adhesive name.Solvar 405, and 6 parts of a sodium suitonate of an oleic acid ester of an aliphatic compound sold under the trade name "Igepon AP." However, any of the repellents exemplified in my copending application Serial No. 421,927, iiled December 6, 1941, may be utilized. I further-apply on and directly to the surface of the separator a coating or lamination i2 of pressure sealing adhesive. vThis lamination of adhesive preferably consists of 4 parts of polymerized isobutylene having an average molecular weight oi 50,000 sold under the trade name Vistanex', l part of milled crepe and 5 parts of soft hydrogenated terpene resin.4 However, othersuitable pressure sealing adhesives as disclosed in the above mentioned copending -application mayr. be utilized.

Ii the separator; is composed Vci .water-prooi substances such as styrenapolystyrene, or waterprooi varnishes, the vcornrmsed tape is rendered water-prooi. However, ii gasoline prooi tape is desired, then polystyrene woulolnot be satisfactory but a separator of vinyl chloride-vinyl acetate resin would be satisfactory as I have found from my experimentations. When it is desired to produce a paper tape resistantto both water and gasoline then i have found from my experiments that two dierent substances can he used, one as a separator and another as a repellent primer. have also found from esperimentations that where a tape is desired which is resistant to both water .and gasoline that vinyl chloridevinyl acetate resin and/or varnish on both sides of the paper craft would be satisfactory.

In the process of manufacture, after the separator lamination has been applied to one side of the paper craft and the repellent primer to the other, the next step is to apply the repellent directly to the repellent primer coating. After the repellent is applied directly to the repellent primer coating the tape is passed through a drier and the repellent properly dried. Thereafter in consecutive order the adhesive is applied on the separator coating or lamination and the structure is again passed through a drier for drying operating or drying the adhesive and removing the solvent therefrom. In other words there are two separate and consecutive coating and drying operations. As the structure is passed through the drying operations, the solvent is removed. During each drying operation there is a temperature maintained ranging progressively from 120 F. to 275 F. during which operation all the solvent is removed from the adhesive and the repellent.

The pressure sealing adhesive lamination which I have heretofore exemplified maintains its pressure self-sealing capacity or characteristics over very long periods of time, indeed, we might say permanently for all intents and purposes, and by providing the separator between the adhesive and being broken down or its intended functions impaired by impurities in the paper setting up a catalytic action is entirely overcome.

Having thus described my invention, I claim:

1. A pressure sealing adhesive tape comprising five layers of materialrmly secured together,

` including in order a pressure vsealing adhesive layer, a water and moisture proof separator layer, a base comprising a paper tape, a' repellent primer layer and a layer of material repellent to said pressure sealing adhesive, said separator layer serving to prevent the adhesive composition from contacting the paper tape.

accessi 2. A pressure sealing adhesive tape comprising ve layers of material iirmly secured together, including in order a pressure sealing adhesi've layer, a. separator layer, a base comprising a paper-tape, a repellent primer layer and a. layer of material repellent to said pressure sealing adhesive, said separator layer serving to prevent the adhesive composition from contacting the paper tape.

3. A pressure sealingadhesive tape comprising ve layers of material ilrmly secured together, includingin order a pressure sealing adhesive i layer, a plastic separator layer, a base comprising a paper tape, a repellent primer layer and a layer of material repellent to said pressure sealing adhesive, said separator layer serving to prevent the adhesive composition from contacting the paper-tape.

4. A pressure sealing adhesive tape comprising ve layers of material firmly secured together, including in order a pressure sealing adhesive layer, a plastic separator layer, a base comprising a paper tape, a repellent primer layer and a layer oi material repellent to said pressure sealing adhesive, the material of said separator layer being impregnated in said paper tape, and said separator layer serving to prevent the adhesive composition from contacting the paper tape.

' 5. A pressure sealing adhesive tape comprising ve layers of material iirmly secured together, including in order a pressure sealing adhesive layer, a plastic separator layer, a base comprising a paper tape, a relatively thin, glossy surfaced plastic repellent primer layer and a layer of material repellent to said pressure sealing adhcsive, said separator layer serving to prevent the adhesive composition from contacting the paper tape.

6. A pressure sealing adhesive tape comprising Y lve layers of material firmly secured together, including in order a pressure sealing adhesive layer, a plastic separator layer, a base comprising a paper tape, a repellent primer layer and a layer of material repellent to said pressure sealing adhesive, said separator layer serving to prevent the adhesive composition from contacting the paper tape, said adhesive composition comprising polymerized, isobutylene of a relatively high average weight, natural crepe rubber and soft hydrogenated terpene resin, and said repellent comprising an incompletely hydrolyzed polyvinyl acetate and a sodium sulfonate of an oleic acid ester of an aliphatic compound.

'1. A pressure sealing adhesive tape comprising ve layers of material iirmly secured together, including in order a pressure sealing adhesive layer comprising polymerized isobutylene of a relatively high average weight, natural crepe rubber and soft hydrogenated terpene resin. a plastic separator layer comprising vinyl chloridevinyl acetate resin, a base comprising a paper tape impregnated with the material of said sepaf rator layer, a repellent primer layer comprising said vinyl chloride-vinyl acetate resin material serving to give the tape resistance to water, gasoline and the like.

8. A pressure sealing adhesive tape comprising five layers of material firmly secured together,

including in order a. pressure sealing adhesive layer, a plastic separator layer, a base comprising a paper tape, a repellent primer layer and a layer of material repellent to said pressure sealing adhesive, said separator layer serving to prevent the adhesive composition from contacting the paper tape, said adhesive composition comprising four parts of polymerized isobutylene having an average molecular weight of 50,000 sold under.

the trade name "Vistanex, one part of milled crepe and ve parts of soft hydrogenated terpene resin, and said repellent comprising four parts of an incompletely hydrolyzed polyvinyl acetate sold under the trade name "Solvar 405" and six parts of e sodium sulfonate' of an oleic acid ester of an aliphatic compound sold under the trade name Igepon AP.

GUSTAVE SCHIEMAN.

` CERTIFICATE 0E CORRECTION. Patent No.' 2,558,851. september 26, 191m.

GUsTAvE SCHIEMAN.

It is hereby certified that error appears in the printed specification of the above 11L1Jr1`0er3 Patent requiring correction as follows: Page l, second column, line h2, for the word" "resilient" read --I-repellentu; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

signed and sea1ed this 2nd day of January, A. D.v 1915.

Leslie Frazer (Seal) Acting Commissioner of Patents

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