US1901799A - Preservative composition - Google Patents

Description

Fatenterl Mar. 14, i933 STA ES JAMES ONE-FOURTH T W. TA?LII I AND ONE-FOURTH T0 DONALD OF EGEILAND, OREGQN E. BROOKS AND JACOB GOLDSTONE, 0F PQRTLADID, OBEGGN, ASSIGNOES OF RZCHABDS, BOTH PRESERVATIVE COMIOSITIUN N0 lirawing. Application filed July 23,

This invention relates to a preservative composition designed primarily for rubber blankets employed in printing presses, but it is to be understood that a composition, in

accordance with this invention may be used to obtain'a preservative action for and in connection with any type of blanket or for any other article or object for which it is found applicable, and the invention has for its object to provide, in a manner as herein after set forth, a composition of the class referred to which, when applied to the blank et will form a coating or film on the face, back and edges thereof and be permanently associated with the blanket to make the latter ink repellent, impervious to ink, oil, water and allied products without in any manner destroying or impairing the pliability, flexibility and resiliency of the material from which the blanket is formed under such conditions materially prolonging the life of the blanket.

Stereotype, electrotype and other kinds of printing plates used for printing on printing presses a e seldom accurate on the printing plane and on the printing surfaces. F or the purpose of correcting said imperfections a pliable, flexible and resilient blanket or packing having uniform thicknesses and of a sufficie t height and thickness for printing thereon, is necessary to be placed and fastened upon the face of the impression cylinders, so as to support the paper while in the process of being printed, adjusting uniform- 35 ly the printed impression, and thereby producing auniform and clear printed impression on the paper.

The various kinds of printing press blankets heretofore produced, made from different kinds of pliable, flexible and resilient substances, deteriorate readily unless the substances contained in the blankets are made impervient to ink, oils contained in ink, other oils and water.

Printing press blanks s composed of vulcanized rubber contain great pliability, flexibi .y and uniform resiliency, and by the use produce uniform printed impression at all points, and makes possible the pro- 1929. Serial No. 380,453.

duction of uniform printed impressions on the paper, but the life thereof is short, because of the fact that they are not repellent to ink, nor impervious to oils contained in printers ink, or other oils, and because of said fact their use has been of comparatively short duration.

Ink, oil contained in oils used in and about a printing plant or printing press, and water readily destroy the elasticity, pliability and resiliency of the substances contained in printing press blankets.

The purpose of this invention is to provide a. composition (in liquid form) which, when properly applied, will produce a smooth, uniform, non-porous, elastic and flexible coating or film, permanently associated tothe body portion, on the face, back and edges of a vulcanized rubber blanket, and other kinds of blankets made from pliable, flexible and resilient substances, repellentto ink and impervious to printers ink, oils contained in printers ink, other oils and water, without in any manner deteriorating or destroying the elasticity, pliability or resiliency of the various substances containedin printing press blankets.

To produce a smooth, non-porous, uniform, elastic and flexible coating or film, and which will become permanently associated to the body portion, on a vulcanized rubber printing press blanket and other blankets made from pliable, flexible and resilient substances, and which is repellent to ink, and impervious to ink, oils contained in printers ink, other oils and water, and without destroying the elasticity, pliability and resiliency of the substances contained in printing press blankets is the primary object of this invention and which is attained by a composition formed from a coloring substance, waX, varnish, a drier, pure gum spirits of turpentine and mineral turpentine.

Preferably the composition will be formed from a coloring substance, such as carborvar carbon black or a mineral coloring to provide the composition of a color other than black, it carborvar carbon black was employed, bees wax, W68 long China jVOOCl oil varnish, a

printers ink, other drier such as suprex japan, pure gum spirits of turpentine and mineral turpentine. In lieu of the #208 long China wood oil-varnish, there may be substituted any varnish made with China wood oil, long China wood oil or a combination of China wood oil and linseed oil varnish.

Preferably theproportions of the ingredients are as follows:

Coloring substance 5 pounds ax 6/10 pound Varnish 8 gallons Drier gallon Pure gum turpentine 2 gallons Mineral turpentine 1 gallons The proportions as named will make about twelve (12) gallons of the composition in liquid form. The same proportions should be used if a lesser quantity is desired.

The pure gum turpentine used is the commonly know turpentine as obtained by the distillation of a natural oleo-resin which exudes from various species of trees belonging to the Conifer. he mineral turpentine em ployed is the commonly used substitute for turpentine which is a distillate of petroleum.

The foregoing ingredients are combined in a finished product by the following method:

Take four (l) gallons of #268 long China wood oil varnish and heat to 300 degrees; then add 6/10 lb. bees wax (or other wax) stir thoroughly until wax is thoroughly dissolved; then add five lbs. of carborvar carbon black, (if other colors are desired add '5 lbs. of any other mineral coloring); then add remaining 4 gallons of 68 long China wood oil varnish; gallon of dryer (suprex japan), or any other good dryer; 2 gallons pure gum spirits turpentine, and 1 gallons mineral turpentine; mix thoroughly.

The foregoing ingredients when properly mixed, are applied to both sides and the edges of a vulcanized rubber printing press blanket, and to other printing press blankets made of elastic, pliable and resilient substances, by applying the same with a brush or by the use of a spray or other mechanical means. After the substance has been allowed to dry any additional coats of the same compound can be applied in a like manner.

The physical and chemical characteristics of mineral turpentine and gum turpentine are as follows:

Mineral turpentine Color (Saybolt) Not darker than 21 Flash point (tag. closed) Not below 100 F. \Vhite lead test Negative Doctor test Negative Corrosion test A clean copper strip when submerged for hour in the Mineral Turps at its boiling point shall show no marked tarnishing. A very slight tarnish will be disregarded. Distillation The distillate below 320 F. (150 C.) shall not exceed 5%. The end point shall not be higher than 146 F. (230 C.) Acidity The residue remaining in the flask after distillation is completed shall be neutral in residue.

What we claim is:

1. An ink repellant, preservative composition for printing press blankets consisting of five pounds of a coloring substance sixtenths of a pound of bees wax, eight gallons of long China wood oil varnish, threequarters of a gallon of drier, two gallons of pure gum spirits of turpentine, and one and one-quarter gallons of mineral turpentine.

2. A combined ink repellant and preservative for printing press blankets comprising a liquid body for coating the blanket in a film like form, said body consisting of live pounds of a coloring substance, six-tenths of a pound. r of beeswax, eight gallons of long China wood oil varnish, three-quarters of a gallon of a drier, two gallons of pure gum spirits of turpentine and one and one-quarter gallons of mineral turpentine, said body possessing a the characteristics of uniting with and preserving the blanket when applied to the latter without destroying or injuring the elasticity, pliability or resiliency of the blanket, and said body possessing pliable, elastic, flexible, a soft, smooth, non-porous, ink-repellant, an impervious characteristics.

In testimony whereof, we aiflx our signatures hereto.

- JAMES H. BROOKS. JACOB GOLDSTONE.