US2265144A - Adhesive - Google Patents

Description

Patented Dec. 9, 1941 ADHESIVE Edward F, Christopher and Frank D. De Beukelaer, Chicago, Ill.

No Drawing.

Application December 24, 1938,

,. Serial No. 241,705

Claims. (Cl. 106-125) This invention relates to an improved animal glue, glue-like substance, gelatin or mixtures'of these materials.

One of the objects of this invention is to provide a glue substance whose original flexibility and prompt remoistening properties-are not adversely afi'ected, although the products may be held for long periods'of storage.

Another object oi this invention is to provide a glue substance which possesses the property of rapidly resetting after application of moisture.

Other objects and advantages of this invention will become apparent from the following description and claims.

In the manufacture of a wide variety of articles, a base material, such as paper, cloth and the like, is provided with a coating of a glue substance. In such products as gummed tape the ideal properties of a glue substance coating are .more or less conflicting. For such uses, it is desired that the glue substance'possess a property of retaining its original flexibility and prompt remoistening value over long periods of storage. It is also desired that such a coating shall have a very rapid resetting property after application 01' moisture to the coating.

The term hygroscopic is employed to designate the property of the glue to absorb moisture from the atmosphere in such quantities that the glue becomes tacky. The term prompt remoistening value" is employed to designate the property of theglue to take up water on application K directly to the surface of the glue and to pass into colloidal solution.

It has been proposed to prepare glue substances for such purposes by the addition of hygroscopic materials, such as glucose, sugar, glycerin or combinations of these materials. In the preparation of glue substances by the addition of such hygroscopic materials, such large amounts of the materials are necessary to produce the desired flexibility and remoistening valuesthat the products possess the undesirable property of becoming very tacky in moist or humid weather. In the case 01' gummed tape, for example, in moist or humid weather, an adhesive layer prepared with such hygroscopic materials becomes sufliciently tacky to adhere it to the uncoated side of the paper in the roll,'or in the stack it the tape is in sheet form.

groscopic when dried. In practicing the invention therein disclosed, quantities of the reagent are added to impart the desired properties.

The present invention contemplates the addition of small amounts of urea, or urea derivatives, such as biuret, to dry glue after the glue has been ground, or the addition of small amounts of the reagents to the glue-liquor during the process of manuiacture. The quantity oi. reagent added to the glue is within a range which is below the range employed in the process disclosed in Patent No. 1,950,483. The amount of reagent added to, the glue is a small amount sui- In our Patent No. 1,950,483 we disclose the use oi urea and urea derivatives in the preparation of adhesives from animal glue to impart to the animal glues the properties of existing in a liquid state at ordinary temperatures and of being hyflcient to impart the desired properties, but is insufficient to impart the properties of existing in a liquid state at ordinary temperatures and 0! being hygroscopic when dry.

We have discovered that the amount of urea or urea derivative which must be added to the glue substance to obtain the desirable properties varies with the grade of glue, the higher grade glues requiring larger proportions of the modifyto ten per cent by weight of urea will not become tacky although the atmosphere may be very moist or humid.

We have also iound that a mixture of urea and calcium nitrate, for example, from two and one-half per cent to twenty per cent 01 the commercial mixture of equal parts of these two sub stances which is known as Calurea, may be substituted for pure or commercial urea. The use of a-mixture of calcium nitrate and urea permits the preparation of a glue having a greater de- Gummed tape, for example, having a coating without adversely afiecting the original flexibility and the prompt remoistening properties of the glue coating. The glue coating will not absorb. suflicient moisture from the atmosphere in humid weather to cause the glue coating to become tacky.

We claim: 1. Dry animal glue consisting of animal glue and from two and one-half per cent to ten per cent urea, the urea imparting to the glue the properties of having a prompt remoistening value and a rapid resetting quality, but being insufiicient to impart tothe glue the property of being hygroscopic when dry.

2. Dry animal glue consisting of animal glue and from two and one-half per cent to ten per cent of a mixture 0! equal parts of urea and calcium nitrate, the reagent imparting to the glue the properties of having a prompt remoistening value and a rapid resetting quality but being insumcient to impart to the glue the property of being hygroscopic when dry.

3. A dried glue composition consisting of animal glue and from two and one-half per cent to ten per cent of a reagent selected from the group consisting of urea, biuret and a mixture of equal amounts of urea and biuret, the amount 0! reagent 'being sufllcient to impart prompt remoistening values and a rapid resetting quality but being insuillcient to impart to the glue the property of being hygroscopic when dry.

4. A dried non-hygroscopic glue composition consisting as the essential ingredients glue and a reagent selected from the group consisting of urea, biuret and a mixture of about equal amounts of urea and calcium nitrate, the amount of the reagent being present not in excess of about 10% but in sufilcient amount to impart remoistening values and a rapid setting quality.

5. A dried glue composition consisting of animal glue and from two and one-half to ten per cent biuret, the biuret imparting to the glue the properties of having a prompt remoistening value and a rapid resetting quality but being insumcient to impart to the glue the property of being hygroscopic when dry.

EDWARD F. CHRISTOPHER. FRANK L. DE BEUKELAER.

7 Patent No. 2,265,114.14;-

CERTIFICATE OF CORRECTION" December 9, l9LLl.

EDWARD F. CHRISTOPHER, ET AL.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows{ Page 2, sec-- 0nd column, line- 5, claim 5, for "biur-et" read -calcium nitrate-; 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 sealed this 27th ,day of January, A. D. 1914.2.

. Henry Van Arsdale, (Seal) Acting Commissioner of Pa