JPS59191777A - Marker ink for overhead projector - Google Patents

Abstract

PURPOSE:To provide the titled ink excellent in erasability and quick drying, yielding clear, sharp writing with adequate stickiness, by dissolving dyes, resins, and polyether-modified silicone oils in org. solvents. CONSTITUTION:1-30wt% acidic, basic, or salt-forming dye (C.I. Solvent Black 29), 1-40wt% resin (e.g., maleinized rosin), and 0.01-2wt% polyether-modified silicone oil of formula I or formula II [wherein R is an (un)substd. monovalent hydrocarbon group; R' is alkyl or alkyl phenyl ether of polyoxyalkylene; 2<=m+ n<=70] are dissolved in an org. solvent having a vapor pressure (20 deg.C) of 1- 100mm.Hg or a b.p. of 50-180 deg.C (e.g., ethyl alcohol) to yield a marker ink for an overhead projector having a viscosity of 8cps or below and a surface tension (25 deg.C) of 22dyne/cm or below.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a marker ink for an overhead projector. In detail, for overhead projector (hereinafter abbreviated as OHP) films made of polypropylene, polyvinyl chloride, polyester, acetate, etc., we provide handwriting such as a single character with a transparent and sharp design with appropriate adhesion. This invention relates to an OHP marker ink that satisfies handwriting erasability with solvents, quick drying properties, etc.

In OHP marker ink, since the handwriting on the film surface is projected and magnified by white light (visible light), emphasis has traditionally been placed on sharpening the handwriting, especially on suppressing blurring of the handwriting.

Conventionally, methods for suppressing bleeding include (1) increasing the viscosity of the ink, (2) incorporating a solvent that dissolves or swells the applied film, and (8) increasing the surface tension, etc., and various studies have been conducted regarding these. However, it does not have the performance of the present invention described above.

That is, although (1) above can suppress bleeding in a region exceeding approximately 10 cps (20°C), it also reduces the flow of ink from the pen tip, and it often becomes impossible to write due to evaporation of the ink after long-term use. Met. In (2), there is no practical solvent for polypropylene or polyester films, and the target is limited to polyvinyl chloride or acetate films, and the application of solvents that dissolve or swell the film is difficult because the dissolved resin on the film surface It clogs the pen tip and reduces ink flow.Furthermore, this type of ink stains the film, making it impossible to erase handwriting when cleaning it with a solvent, which is undesirable.
3) High surface tension is difficult to put into practical use due to limitations in solvent selection. To explain this point, in order to prevent handwriting from blurring on the film surface.

Conventional inks have a surface tension of at least 40 dyn.
Δm (20°C) or higher is required, but it satisfies quick drying properties. Among practical solvents such as alcohols, ketones, esters, aromatic hydrocarbons, and glycol ethers having a boiling point of 150'C or lower, the above-mentioned high surface tension solvents cannot be found. The surface tension of the practical solvent is approximately B Odyn/I
1. m (206C) or less, metal corrosion and safety even if the specified sintering agent satisfies the above requirements.

It is difficult to put it into practical use due to solubility, drying properties, etc.

As mentioned above, the OHP of the present invention has problems with the conventional means and does not satisfy the various performances of the present invention described at the beginning.
By blending polyether-modified silicone oil into the coloring medium, the marker ink for use in marker ink has the various performances described at the beginning, and also satisfies marker suitability such as ink flowability from the pen tip and storage stability over time.

Next, the present invention will be explained in detail.

The OHP marker ink of the present invention is composed of a dye, a resin, a polyether-modified silicone oil, and an organic solvent that dissolves all of the above components as essential components.

The main feature of the above is that a polyether-modified silicone oil is blended into one coloring medium, thereby achieving a low viscosity and low surface tension (8 cps or less + 22 dyn%m or less, (25°C)) that is effective for writing. ) is required to produce sharp handwriting without blurring.

As specific examples of polyether-modified silicone oils, those represented by the following general formula (1) or (2) are particularly effective.

In the formula, R is an alkyl group, an alkenyl group, a 71J-l group,
An unsubstituted monovalent hydrocarbon group or a substituted-valent hydrocarbon group exemplified by an aralkyl group, R゛ is an alkyl or alkyl of polyoxyalkylene such as polyethylene glycol, polypropylene glycol, or ethylene glycol-propylene glycol copolymer It represents a phenyl ether group and is 2 m + n l, 70.

Specifically, commercially available products include KF-851, KF-852, and K
F-853KF-610, KF-611, KF-907
, KF-945, KF-911 (Shin-Etsu Chemical Co., Ltd.
), Decoprene 100, Decoprene 425 (manufactured by Goldschmidt, West Germany), and the like.

The above polyether-modified silicone oil is 0 in the ink.
0.01 to 2% by weight, preferably 0.05 to 0.05% by weight.
It can be applied in a range of 8% by weight. (The following percentages indicate weight percentages.) The polyether-modified silicone oil in the above range has an affinity for the film surface due to the action of a nonionic surfactant, as shown by R'' in the structure, and an organopolymer of the basic skeleton. It is presumed that the anti-compatibility of siloxane with film is balanced and clear handwriting without bleeding can be obtained.

Let's talk about dyes. Any of acidic, basic and salt-forming dyes can be used as long as they are well soluble in solvents.

C9 engineering, 5olvent Black 29, O
, Eng., 5O1-vent Black 5, O, ■
, black dye such as 5olvent Black 7,
C1■, 5olvent Red 1B, C, Engineering, 5olvent R6d82.0. Engineering, Ba5i
c Red 1, O, Engineering, Ac14 Yellow
2!3 and C8■-Basic Red 1, a red dye such as a salt-forming body.

C0■, Ba5ic Blue 7, O, Engineering, 5
olive Blue 5, C0■.

Ba5ic Elue 55, C0■, 5olv
ent Blue 25, O, ■, 5ol-ven
t Blue dye such as Wa0, C0■, Solv
entYellow 84, C1■, Ac1d Y
yellow 2B, O, Engineering, AcidYello
w 42, O, ■, 5olvent Yellow
Yellow dye such as 80, 0. Engineering, Ba5ic Vio
let l, C0■, 5olvent Viol
et8-19 etc. are used. In the ink of the present invention, at least one of the dyes is used in an amount of 1 to 80%, more preferably 5 to 20%. Organic amines, organic acids, resin acids, etc. may be used as necessary to promote the dissolution and stability of the dye.

Let's talk about resin. The resin used in the ink of the present invention may be any air-drying resin as long as it is compatible with the dye and provides good adhesion and gloss to the film. For example, ketone resin, pure phenol fat, alkylphenol 1m fat.

Allylphenol resin, rosin, maleated rosin, esterified rosin, acrylic ester resin, styrene
maleic acid resin, pvp (polyvinylpyrrolidone),
Examples include P'VP-vinyl acetate copolymer, polyvinyl butyral, cellulose derivatives, sulfoamide-formaldehyde resin, vinyl chloride-vinyl acetate copolymer, and the like. In the ink of the present invention, at least one of the trees 11ff is used in an amount of 1 to 40%, more preferably 5%.
It is used in the range of 80% to 80%. As the solvent, water, alcohol, glycol ether, glycol ether acetate, ketone, ester, aromatic hydrocarbon, etc. are used, but since quick drying is required, the vapor pressure is 1 to 100 tMl/7 at 20°C or Boiling point is 50°C under monotonous pressure
Those having a boiling point of 80°C to 150°C, preferably a vapor pressure of 5 to 50°C, are used.

Next, examples of the present invention are shown in Table 1, and their performances are listed in Table 1.

As shown in Table 2, the ink of the present invention to which polyether-modified silicone oil was added was lower than the comparative ink.
All of them are good and have a good combination of performance.

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Claims (1)

[Claims] A marker ink for an overhead projector whose essential components are a dye, a resin, a polyether-modified silicone oil, and an organic solvent that dissolves all of the above components.