JPS6129596A - Vinyl chloride resin composition for erasing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] "Industrial application field" The present invention relates to a vinyl chloride resin composition for erasing characters.

``Conventional Technology J Currently, erasers made of synthetic rubber and vinyl chloride resin are often used.However, depending on the type of paper, the former may contaminate the surface of the paper or leave scraps. It often adheres to sticky outer letter erasers (furthermore, the biggest drawback in commercially available products is that they are opaque and lack aesthetic appeal).

The latter is manufactured from vinyl chloride resin with an average degree of polymerization of 1000 or more, and it alone has little eraser effect, and the shavings from the eraser are difficult to separate from the eraser, and calcium carbonate, Various fillers such as lath powder are blended to improve the erasing effect (erasing effect) and the separation effect of shavings. This improved eraser contains a filler, so it is opaque, and even if it is colored, it does not look beautiful.

"Problems to be Solved by the Invention" As a result of intensive study on the erasability and transparency of erasers made of vinyl chloride resin, the present inventors discovered that the main components are vinyl chloride TMM with a low degree of polymerization and a plasticizer. In particular, if the eraser is composed of butylbenzyl 7-thalerate or butylbenzyl 7-thalerate, it will have excellent transparency, and even without the use of a filler, it will have excellent characterability, and the shavings will be easily removed. It has been found that the eraser can be separated from the eraser, and since it is transparent, it can be easily colored, and that an eraser with extremely good appearance can be obtained.

[Means for Solving the Problems] That is, the object of the present invention is to provide a vinyl chloride resin composition for erasing characters that exhibits the above-mentioned effects. 100 parts by weight, and 3-0 to 150 parts by weight of butylbenzyl 7-thalerate or butylbenzyl adipate.

To explain the present invention in detail, the vinyl chloride resin used in the present invention is not limited to a homopolymer of vinyl chloride,
Comonomers mainly composed of vinyl chloride and copolymerizable with vinyl chloride, such as vinyl chloride, vinyl acetate, vinyl propionate, vinyl butyrate, methyl acrylate, methyl methacrylate, ethyl methacrylate, maleic acid,
Examples include copolymers with marleic anhydride and the like. The method for producing the vinyl chloride resin is not particularly limited either, and it may be obtained by suspension polymerization or emulsion polymerization. However, transparent fish to vinyl chloride homopolymers are preferred.

Therefore, the average degree of polymerization of the vinyl chloride resin needs to be 800 or less, and is preferably in the range of 100 to 600, particularly in the range of 200 to 500. Erasers obtained from compositions using vinyl chloride resins with an average degree of polymerization greater than 800 do not allow shavings to be easily separated from the erasers; The eraser obtained from the above tends to become brittle and have poor erasing effect as the average degree of polymerization decreases.

The vinyl chloride resin composition of the present invention contains 7 butylbenzyl 1. or butylbenzyl adipate.

Therefore, the distribution ratio of plasticizer is 10° for vinyl chloride resin.
30 to 150 parts by weight are used, especially 5 parts by weight.
It is desirable to use it in a range of 0 to 100 parts by weight. Composition 1 of the present invention also contains a plasticizer commonly used for vinyl chloride resin, within a range that does not deteriorate the transparency of the eraser.
For example, dioctyl 7 tallate, dibutyl 7 tallate,
Diisodecyl 7-talate, ditridecyl 7-talate, dinonyl 7-talate, diisodecyl 7-talate, and mixtures of higher alcohols with different alkyl groups are combined with 7-talic acid-based plasticizers such as ester compounds of 7-talic anhydride, trioctyl trimellitate, trioctyl isooctyl trimellitate,
trioctyl trimellitate, dioctyl adipate,
Small amounts of epoxidized soybean oil, epoxidized fatty acid esters, chlorinated fatty acid esters, tris-β-nichloroethyl phosphate, chlorinated paraffin, etc. can be added6. However, the amount of plasticizer added is limited to the above-mentioned range. It is desirable to do so.

The resin composition of the present invention may also contain a stabilizer commonly used for vinyl chloride resins. Stabilizers that do not cause the composition to lose transparency include epoxy stabilizers, barium stabilizers, calcium stabilizers, tin (Sn) stabilizers, and zinc stabilizers. It is desirable to have at least one selected from these.

Of course, commercially available calcium-zinc type (Ca Zn type),
Composite stabilizers such as barium-zinc P (Ba-Zn type) can also be used. The epoxy stabilizer may also be epoxidized soybean oil used as a plasticizer.
1゜The amount of these stabilizers added is O0゛1 to 10 with respect to 100 parts by weight of the total amount of vinyl chloride resin and plasticizer.
Preferably, they are used in parts by weight.

Furthermore, additives such as lubricants such as stearic acid, pigments, and dyes may be mixed into the composition of the present invention within a range that does not impair erasing performance or aesthetic appearance.

The composition of the present invention can be produced by adding vinyl chloride resin, plasticizers, stabilizers, and other additives, and using conventional methods such as mixing rolls, extrusion mixers, Banbury mixers, Henschelmi mixers, etc. In order to obtain an eraser from the composition of the present invention, the composition is heated and gelled.The means for this is injection molding, depending on the desired shape. Various molding methods such as an extrusion molding method, a pressure molding method, and a cast molding method are appropriately employed.

The eraser obtained from the vinyl chloride resin composition of the present invention is
It has extremely good transparency, produces an excellent lovemaking effect, and the shavings after the eraser are easily separated from the eraser, giving it an unprecedented surname function. In addition, since the eraser is transparent, it can be colored as desired and is beautiful, making it extremely useful as a toy and eraser.

Hereinafter, the present invention will be explained in detail with reference to Examples, but the present invention is not limited to the following Examples unless it departs from the gist thereof.

Example 1 and Comparative Examples 1 to 3 100 parts by weight of vinyl chloride resin having various average degrees of polymerization shown in Table 1, 76 parts by weight of various plasticizers, 2 parts by weight of epoxidized soybean oil, and 0.5 parts by weight of stearic acid. parts were blended and thoroughly mixed to prepare vinyl chloride resin M for erasing. The composition was prepared with a diameter of 2301φ and a length of 350. mm, number of revolutions 1
7r, p, m, front and rear roll rotation ratio 1:1, 120 of 25
Knead for 5 minutes with a roll heated to ℃ to a thickness of 2Io11.
A composition sheet of No. 1 was obtained. This sheet was preheated at a temperature of 150°C for 2 minutes, and at the same temperature, 190-200 kg/e
Heat and pressure molding was carried out under a pressure of 112 mm, followed by cooling to room temperature to obtain an eraser with a thickness of 7III111, a width of 20 aha, and a length of 30 IaI11.

The surname effect was investigated using a testing machine shown in the drawing, and the transparency was observed, and the results are shown in Table 1.

In addition, a commercially available ML (containing vinyl chloride resin and filler) was also tested.

As shown in the drawing, the structure of the surname character tester is such that a gripping tool 4 weighing 2 kg is reciprocated on the base 1 by rotating a handle 3 through a base 1 and a support 2 attached to it. It consists of a rank device. 5 indicates a pencil or eraser.

E Last name test method] Fix an HB pencil (Mitsubishi 9800) to the clamping tool 4, and once by rotating the handle 3 on the paper surface on the base 1, give a thickness of 211 mm.
+1, a line with a length of 50 mm was drawn, then the pencil was changed to an eraser, and the number of reciprocating movements until the line disappeared (one time each) was measured to determine the surname quality.

[Transparency Observation Test Method] The same eraser as in the above Examples and Comparative Examples was applied to a 2 mm2 letter written on a white paper using an HB pencil, and the appearance of the letter was observed with the naked eye. It was observed and evaluated as follows. The thickness of the commercially available eraser was adjusted to 7III+6.

◎ Clearly visible ○ Adequately visible Δ Difficult to see × Not visible at all From the results shown in Table 1 above, the eraser obtained from the composition of the present invention has extremely excellent surname properties and transparency, and also shows that it does not remove shavings after an affair. It tends to erase characters and separates very easily. Erasers obtained from vinyl chloride resins having a high average degree of polymerization are not as good as those obtained from the compositions of the present invention, and are also inferior in transparency. And the shavings do not separate from the eraser.

Commercially available erasers contain a filler, so they have almost the same quality as the present invention, but they roughen the paper surface and are opaque.

Furthermore, the shavings get tangled in the eraser.

[Brief explanation of drawings]

The drawing is a front view of the last name test Tsuki. In the figure, 1 is a base, 2 is a support, 3 is a handle, 4 is a clamp, and 5 is a pencil or an eraser. Patent applicant Misara Monsanto Chemical Vinyl Co., Ltd. Representative Patent attorney Hase - (1 other person)

Claims (3)

[Claims] (1) A vinyl chloride resin composition for erasing, comprising 100 parts by weight of a vinyl chloride resin having an average degree of polymerization of 800 or less and 30 to 150 parts by weight of butylbenzyl phthalate or butylbenzyl adipate. (2) The vinyl chloride resin composition for erasing according to claim 1, wherein the vinyl chloride resin has an average degree of polymerization of 100 to 600. (3) The eraser according to claim 1, which contains at least one stabilizer selected from epoxy stabilizers, barium stabilizers, calcium stabilizers, tin stabilizers, and zinc stabilizers. Vinyl chloride resin composition for use.