US1683453A - Coated paper - Google Patents

Description

Sept. 4, 1928.

F. w. FARRELL COATED PAYER Filed July 17, 1925 ADHESIVE COATING ADHEJ/Vf COATING PAPER FILLER Patented Sept. 4, 1928.

UNITED STATES PATENT OFFICE.

FREDERICK W. FARRELL, OEBROOKFIELI), MASSACHUSETTS, ASSIGNOBTO MCLAURIN- JONES (70., OF BRO OKFIELD, MASSACHUSETTS, A CORPORATION OF MASSACHU- SETTS.

COATED PAPER.

Application filed July 17, 1925. Serial No. 44,358.

This invention relates to coated papers, and more especially to gumined papers, cloth, and other sheet ma terials, hereinafter referred to as paper.

It is now a common practice to apply paint, varnish, and the like, to furniture, automobiles, and other articles, bymeans of a spray gun. In sprayingthe paint onsome kinds of work, it is necessary to protect some parts of the work from the spray. This is particularly true in painting automobiles since different parts of an automobile. are often painted in different colors and some parts, such as the windshield, windows and upholstery must always be protected from the paint or varnish. At present the usual practice is to cover the parts to be protected with newspapers, or other cheap paper, and to hold the paper in' place by means of surgeons tape or ordinary gumme'd sealingtape.

The surgeons tape is expensive, and the sealing tape can be removed after the work is finished only with considerable difficulty.

It is essential that the adhesive tape used shall have sufficient strength and adhesi ii to hold the covering paper from being blow off the workby the force of the blast of air which creates the spray. At the same time it is desirable that the paper be stripped ofi o easily when the work is finished, and-that any of the adhesive 'whichis left on the work be of such a character-that it can be easily removed. I

The present invention aims to devise an 5 adhesively coated paper whi'chwill berelatively inexpensive to manufacture and will be especially adapted for use under the conditions above described. I

I have found that the foregoing. require- 40 ments are satisfied by a paper coated with a water soluble adhesive carrying a sufficient quantity of glycerine' or some other hygroscopic agent to keep the adhesive tacky under normal atmospheric conditions. The adhegive used may consist of Irish moss, latine glue, gum tragacanth, or the like. of its low price I prefer to-us'e'Irish'moss, but since the adhesive properties of thismaterial vary considerably, I add to it a certain percentage of gelatine glue or some equivalent material which is of a more uniform character. A formula which has proved sat nisfj cjpry consists of- 10 parts, by weight, of Irish iToss',8 parts of gelatme glue, 125 parts ecause of water, and'60 parts of glycerine. This formula may, however, be varied considerably, and I have found that good results are produced by using from 8 to 15 parts 'of' Irish moss, with gelatine glue varying from zero to 10 parts, glycerine from 45 to 75 parts, and water from 125 to 275 parts. Also, other water soluble adhesives may be used in .place of those mentioned.

An adhesive material made by formulae such as those above given can be applied to the paperwith the usual coating machinery. A large art of the water subsequently is driven oil by drying so that the quantity of water remaining in the coated paper when it is ready for the market is approximatel equal to the glycerine. In this condition e coating is tacky under normal atmospheric conditions and will remain tacky practically indefinitely. p v

I prefer to use a relatively strong paper, such as a kraft paper, and to coat one side of the paper with starch; casein, or some other filling material which will protect the paper from abrasion. The BdhQSIVG COatiIIg is-applied to the opposite side of the paper.

Figs. 1- and 2 of the accompanying draw ings are perspective and cross-sectional views, respectively, illustratin a coated paper embodying this invention. he paper sheet is shown at 2, the adhesive coating at 3, and

the filling material at 4. It will be understood that the thickness of the paper and coatings necessarily is exaggerated in Fig. 2.

In order to prevent the paper when wound in rolls or stacked in sheets from sticking together andcaking, I-prefer to insert a strip or sheet of glassine or' other moisture resist- 'ing paper between adjacent sheets of the g'ummed paper.

This gummed paper is-used in the. usual manner either directly to cover the surface to be protected from the paint or varnish spray, or in strips to secure another protective paper to the work. The adhesive coating is usually moistened before the paper is-applied to the work in order to increase the tackiness of the coating, and whenthe 'work is finished the paper can easil be stripped ,o'fi due to the act'that the a hesive coating has remained A tacky or sticky. The paper can then be used again eitherwith or without additional moistening. Usually it is not-necessary to .moistenlit for subsequent applicationabut I this may be necessary occasionally due to the fact that the solvent used 'in the paint sometimes dries out a certain amount of the water in the adhesive coating. The fact that the back of the paper, that is, the surface which is not covered with adhesive, is coated with a filler which protects the paper against roughing up when it is rubbed in being applied to the work, greatly increases the life of the paper.

While I have herein disclosed the best embodiment of my invention that I have so far devised, it will be appreciated that the inven tion is susceptible "of embodiment in many forms without departing 'from the spirit or scope thereof.

Having thus described my invention,*what I desire to claim as new is:

1. An article of the character described comprising paper having one side thereof 2 ing a small percentage of a water soluble adhesive, a larger percentage of glycerine, and a proportion of water approximately equal to that of glycerine. I I

3. An article of the character described comprising a relatively strong sheet of paper having on one side thereof a coating to protect it against abrasion, and on its opposite side a coating of a relatively weak water soluble adhesive including a substantial percentage of glycerine.

FREDERICK W. FARRELL.

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