DE1669111A1 - Water-soluble writing fluid for writing instruments with a writing tip made of fibrous or similar material - Google Patents

Description

Water-soluble writing fluid for writing implements with asaa == a == cc = aa = axxsaaaaaasaaaa3aamaa = aaaaa: aa: asasasana Writing tip made of fibrous or similar material asca = cx_cmaaaaa == naaasaaaa = aaaaxaaaa = aaxsassa = aaaaxaaa Screibflüssigkeit the like for a writing instrument with a felt wick or, thus, which is coated with an oil film sheet steel, can be written on and which can be removed with an aqueous material according to the label.

It was particularly important for the rolling industry to create inks for writing implements, the ink of which can be used to write on the metal surface which is coated with a rolling oil film and which can be removed with an aqueous material.

Usual writing implements with water-soluble writing fluid can cannot be used to write on metal surfaces that have an oil film are coated because the writing fluid is repelled by it. On the other hand is it is possible with known writing implements whose writing fluids do not in Water soluble, write on metal surfaces that are covered with an oil film are, however, these marks cannot be easily removed with water.

A water-soluble writing fluid was also created with which inscriptions can be applied to such metal surfaces and which can be removed with an aqueous material. However, such a writing fluid could not be used for marker pens because it did not flow to the writing tip, but instead led to clogging. From the metal surface may further write the liquid will not be removed simultaneously with the washing operation of the oil film.

Writing fluids removed from the metal surface with the aid of a solvent other than water leave a film or mark that would be detrimental to painting or other treatment of the surface to which the ink was applied .

It is an object of the present invention to provide a water-soluble writing fluid for a writing instrument, wherein the writing fluid adheres to a metal surface coated with an oil film, and where the writing fluid can be removed at the same time as the oil film washing operation.

Another goal is to let the writing fluid pass through the felt wick core of a writing instrument can flow without clogging the capillaries of the felt core and without the writing fluid drying up on the tip of the writing instrument.

It is a further object of the present invention that the writing fluid not leave a film or residue which would be detrimental to painting or other treatment of the surface to which the writing fluid has been applied. An example of the usefulness of the writing fluid for the writing instrument can be seen in the marking of rolled steel sheet such as is used in the automotive industry. This type of steel is coated with a rolling oil. The writing fluid mark should be easily erasable by normal water treatment to which the steel is subjected to wash off the oil. After such a water treatment, the steel is coated with a primer or a varnish. In accordance with the present invention , there is provided a writing fluid that contains a combination of chemicals. The mixture includes silicon dioxide (white carbon) to prevent needle hit and to facilitate the adhesion of the writing fluid to the oily metal surface. Carbolic acid is used as a preservative. Polyethylene glycol is used to keep the writing tip of the writing instrument from drying out and to make it possible to easily wipe out the writing fluid without smearing the mark, the latter being effected in cooperation with ethylene glycol monoethyl ether or anionic surfactants. Ethylene glycol monoethyl ether or anionic surfactants are used to smoothly transfer the writing fluid from the tip of the felt-tip pen to the metal surface. Furthermore, it helps to dry the written marking and improves the permeability of the writing fluid on the written material. Furthermore , it creates an affinity for oil, so that you can also see small letters on the surface of a plate that is covered with oil. Casein is used as a fixative and as a means to prevent precipitation. The use of casein as a fixative is very important for the writing fluid according to the invention. In particular, known fixing agents such as starch, natural resins, synthetic resins, gum arabic and alkali silicates cannot achieve the objects of the present invention. The writing fluid that uses starch or natural resins is repelled by the rolling oil. so that the written markings are difficult to read. Furthermore, these markings are not removed by detergent P 3 (this is an international trademark for an alkaline detergent, the main ingredients of which are sodium metasilicate, sodium acetate and a small amount of sodium hydroxide solution), which is used according to the international washing process when mineral oil is to be washed off under conditions below 3 atmospheres pressure and below 70 ° C. The writing fluid that the synthetic resin uses will be dispersed and decomposed. The writing fluid, the rubber. When arabic is used, it will react with the rolling oil and active agents resulting in the production of gel-like material that clogs the felt core. Therefore, gum arabic cannot be used for the writing fluid for writing implements. The writing fluid using alkali silicate will be repelled by the rolling oil, and the written characters will be difficult to read. Since the alkali silicate is in the form of a colloid, the writing fluid using such a material cannot be used for writing implements . However, a writing fluid using casein is free from these drawbacks. The writing fluid according to the invention is obtained by mixing the particular materials described above according to the following examples.

Example 1 - White Ink The mixture is prepared separately and mixed into two separate mixtures. The first mixture, called portion a, consists of titanium white (titanium white pigment), silicon dioxide (white carbon), calcium carbonate, polyethylene glycol and casein solution. The parts are as follows, with all parts being by weight . Materials Preferred Amounts Range Titanium white 13 parts 11-14 parts Silica (white carbon) 6 "4.5-6.5_" Calcium carbonate 1 part 0.8 - 2 " Polyethylene glycol. 12 parts 6.5-12.5 Casein solution 8 "7 - 12" The next mixture, called portion b, consists of casein solution, ethylene glycol monoethyl ether or surface-active agent and carbolic acid. The proportions are as follows, with all parts being by weight. Materials Preferred Amounts Range Casein solution 20 parts 16-21 parts Ethylene glycol monoethyl ether 2.5 "2 - 2.7 81 Carbolic acid (phenol) 0105 "0.04-0.07 The casein solution is composed of 13 parts of casein, 8 parts of borax and 230 parts of water, all parts being based on weight.

Instead of the ethylene glycol monoethyl ether, another humectant, e.g., an anionic surfactant can be used. A suitable one surfactant is made by adding 'INC 3 "to a 50% strength Dilute paste by adding 500 g of water to 1 g of NC 3. NC 3 is a sodium alkylbenzenesulfonate, manufactured by Nihon Yushi Company, Japan. In this example 1 you can use 2.5 parts of the surfactant can be used.

The two admixtures a and b are then put in a ball mill mixed together and passed through a sieve with a mesh size of 0.044 mm (325 mesh) happened. The resulting product is a liquid white writing fluid. This writing fluid is then used to make a felt tip pen to to fill. It creates a white color that does not peel off.

Example 2 - black ink The mixture is prepared as in Example 1, but using the following components (parts by weight): Before- Materials used area amounts a Carbon black 4 3.5-4.5 Silica (white carbon) 1 0.8 - 1.5 Polyethylene glycol 4.5 4 - 5 Casein solution as in Example 1 10 9-11 b Casein solution as in Example 1 22 21-23 Water 5 4.5-5.5 Ethylene glycol monoethyl ether 2.5 2 - 2.7 Carbolic acid 0.05 0.04 to 0.1 Example 3 - red ink The mixture is prepared as in Example 1 to produce a red colored writing fluid, with the following ingredients: Before- Materials used area amounts a red dye (naphthol art Red) 1.5 1 - 2 Watchung red 3.5 3 - 4 Silica (white carbon) 3 1 - 3.5 Polyethylene glycol 4 3 - 4.5 Casein solution as in Example 1 15 11-18 Before- Materials used area amounts b Casein solution as in Example 1 20 17 - 24 Ethylene glycol monoethyl ether 1.5 1 - 2 Carbolic 0 0 5 0.04-0.06 It is clear that other embodiments are within the scope of the present invention, so that, for example, other coloring materials can be used.

Claims (1)

P a t e n t a n s p r u c h Water-soluble writing fluid for a felt-tip pen for marking-on metal surfaces that are coated with an oil film which is composed of a coloring material, silicon dioxide (white carbon), Polyethylene glycol, ethylene glycol monoethyl ether or aasionic surface-active Agents and binders, characterized in that the binder contains casein.