JPS5924737A - Paste vinyl chloride resin composition having excellent erasing properties and transparency and eraser composed of same - Google Patents

Abstract

PURPOSE:To provide a vinyl chloride resin compsn. having excellent erasing properties and transparency and an eraser composed of the same, by blending a specified paste vinyl chloride resin with a specified plasticizer and a stabilizer. CONSTITUTION:Butyl benzyl phthalate (BBP) as a plasticizer and a stabilizer (e.g. tin compd., Ba/Zn compd., Ca/Zn compd. or mixtures thereof, such as tin mercaptide) for paste vinyl chloride resin are blended with a paste vinyl chloride resin such as PHS-650A (a product of Kanegafuchi Kagaku Kogyo K.K.) to obtain the titled resin compsn. and an eraser composed of the same. Pref. 60- 200pts.wt. BBP and 0.1-5pts.wt. stabilizer are blended with 100pts.wt. paste vinyl chloride resin. When the titled compsn. is caused to gel to provide an eraser, a pressing step which is an indispensable stage for the production of conventional transparent erasers can be omitted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paste vinyl chloride resin composition having excellent erasability and transparency, and an eraser made from the same.

Today, in the erasing field, in addition to the original function of erasing, decorativeness, hobbies, and playfulness are required.
A wide variety of erasers have been proposed. One of them is a transparent eraser. Transparent letter erasers have been prized for their uniqueness, cleanliness, clarity, and transparency, which have broken the concept of opaque erasers since ancient times.Erasers with popular Mango characters printed and enclosed inside are especially popular. The school children have accepted it.

However, there is a trade-off between increasing transparency and reducing obsoleteness, which is the original requirement for erasure. The reality is that no proposal has been made to eliminate it yet.

In view of the above-mentioned circumstances, the present inventors have conducted intensive research and have arrived at the present invention, which can surprisingly solve the above-mentioned antinomic difficulties.

After various studies on the vast number of combinations of suspension or paste vinyl chloride resins, plasticizers, and stabilizers that could be obtained, the present inventors developed a specific paste vinyl chloride resin, PSH-65, OA. By combining BBP (butylbenzyl phthalate) as a plasticizer and a specific stabilizer, it was discovered that it was possible to surprisingly achieve old character annotations and transparency at the same time. .

The paste vinyl chloride resin used in the present invention is PSH-65OA (grade name) manufactured by Kanekabuchi Chemical Industry. It is not clear why this grade is the only one that gives surprisingly good results out of more than a dozen types of paste vinyl chloride resins available at home and abroad. However, in general, the factors that affect the physical properties of paste vinyl chloride resin are: ■ degree of polymerization, ■
There are four factors that can be considered: homopolymer or copolymer, (1) particle size and particle size distribution, and (2) emulsifier. Regarding the former three factors, among the many examples that have been tested so far, there is a Considering that the expected results were not obtained even though PSH, -650A was included, it is presumed that the emulsifier contained in PSH, -650A is specifically effective.

The stabilizer used in the present invention is a paste vinyl chloride resin stabilizer that can impart transparency, and suitable examples include tin thread compounds such as tin mercaptide and tin maleate, Ba-Zn compounds, and Ca-Zn compounds. And these are 1
It can be used as a species or as a mixture of two or more. As tin mercaptide, 'MAE Hair 1292 (manufactured by Adeka Argus Chemical)' and as tin maleate, 'M ARK.
Examples include 'H'l'-81 (same)'', 'TVS#8881 (manufactured by Nitto Kasei Kogyo)', etc. Also, examples of Ba-Zn stabilizers include 'MARK, 666 (manufactured by Adeka Argus Chemical)'. , 'KV-62B-4 (manufactured by Kyodo Yakuhin)
', etc., while examples of Ca, -Zn stabilizers include 'H-100J (manufactured by Katsuta Kako)'', '''M.757
2 series (manufactured by Dainippon Ink Chemical Co., Ltd.)'.

The blending ratio of each component in the present invention is BBP6 to 100 parts by weight of paste vinyl chloride resin PSH-650A.
0 to 200 parts by weight and 0.1 to 5 parts by weight of the stabilizer are suitable.

10 PSH-65OA as paste vinyl chloride resin
When using 0% chloride, excellent character strength of 90% or more can be obtained by the test method specified in JIS 56050, and transparency is also very good. Even if a vinyl resin is used in combination, a sufficiently practical product can be obtained.

As mentioned above, a stabilizer that can impart transparency to paste vinyl chloride resin is suitable as a stabilizer, but even if a small amount of other stabilizers are used in combination with this stabilizer, the transparency is sufficient for practical use. can get things.

Further, as the plasticizer, BBP and a small amount of other known plasticizers can be used together.

The above-mentioned paste vinyl chloride resin composition may contain fragrance, if necessary.
Face r1 is added and kneaded in a blender to form a sol. After defoaming, the mixture is heated and heated to gel and form a sol. For defoaming, vacuum defoaming at a temperature of -740 MMH7 or higher is preferably employed, and heating at about 100° C. to 120° C. for about 10 to 13 minutes is preferred.

When the composition of the present invention is gelled to form an eraser, there is an advantage that the pressing step, which is an essential step in the production of conventional transparent erasers, can be omitted. That is, in the production of conventional transparent erasers, a pressing process is essential to expel air bubbles or finely crush and contain air bubbles, but in the present invention, there is no problem even if this process is omitted. There is no.

Hereinafter, the present invention will be explained in more detail by giving Examples and Comparative Examples.

Examples 1 to B, Comparative Examples 1 to 6 Paste vinyl chloride resin, plasticizer, and stabilizer are shown in Table 1; i! Jl+<, add appropriate amounts of fragrance and pigment, knead using a blender to form a sol, defoam this, then place in a mold and heat at 120°C for 10 minutes to gel, then It was cooled and taken out from the mold.

The obtained product was subjected to an extinguishing power test based on 1 King SS 6050, and the transparency was determined by placing a test piece of thickness Iz on top of the printed matter and judging the transparency by five panelists. Observed. The results obtained are shown in Table 1.

*+ PSH-650A (manufactured by Kanebuchi Chemical) PSH-6
80 (// ) PSH-10 (// ) L'-440 (manufactured by Mitsubishi Morsant) PX-A (manufactured by Sumitomo Chemical) *20 13 Nibutylbenzyl phthalate 1) OA Nidioctyl adipate *a MARK EP 13: Epoxy System stabilizer (manufactured by Adeka Argus Chemical) As is clear from the results in Table 1 above, the paste vinyl chloride resin PSH-65OA of the present invention.

BBP as a plasticizer, tin-based stabilizer, Ba-
It is recognized that the combination of Zn-based and Ca--Zn-based compounds surprisingly satisfies both traditional character strength and transparency.

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Claims (1)

[Claims] 1. Erasable material made by blending paste vinyl chloride resin PSH, -650A (manufactured by Kanebuchi Chemical Industry Co., Ltd.) with BBP as a plasticizer and a paste vinyl chloride resin stabilizer that imparts transparency. and a paste vinyl chloride resin composition with excellent transparency. 2. The stabilizer is a tin-based compound, a Ba-Zn-based compound,
The resin composition according to claim 1, which is selected from Ca, -zn type compounds and mixtures thereof. 3. B to 100 parts by weight of paste vinyl chloride resin
The resin composition according to claim 1, which contains 60 to 200 parts by weight of BP and 1 to 5 parts by weight of a stabilizer. 4. A paste vinyl chloride resin PSH-650A (manufactured by Kanebuchi Chemical Industry Co., Ltd.) is blended with BBP as a plasticizer and a paste vinyl chloride resin stabilizer that imparts transparency to form a sol, and after the sol is defoamed, gold is added. It is made by filling a mold and heating it. 5. Stabilizer is a tin-based compound, Ba-Zn 4 compound,
The eraser according to claim 4, which is selected from Ca-Zn compounds and mixtures thereof. 6. B to 100 parts by weight of paste vinyl chloride resin
The eraser according to claim 4, which contains 60 to 200 parts by weight of BP and 0.1 to 5 parts by weight of a stabilizer.