WO2011122719A1

WO2011122719A1 - Non-pvc eraser composition

Info

Publication number: WO2011122719A1
Application number: PCT/KR2010/001956
Authority: WO
Inventors: 송하경; 강성초; 강관호
Original assignee: 주식회사 모나미
Priority date: 2010-03-31
Filing date: 2010-03-31
Publication date: 2011-10-06
Also published as: KR101181019B1; KR20110109245A

Abstract

The present invention relates to a non-PVC eraser composition, and more specifically, to a non-PVC eraser composition comprising: a thermoplastic elastomer comprising styrene-butadiene-styrene, nitrile butadiene rubber and a polystyrene copolymer; a wax; a mineral oil; calcium carbonate (CaCO3); magnesium oxide (MgO); and titanium dioxide (TiO2). The eraser according to the present invention is not toxic and is harmless to the human body because of not using polyvinyl chloride (PVC) which has been used in known erasers, and thus allows children to safely use the eraser. Additionally, the eraser is environmentally friendly because of not discharging endocrine disrupters, and can sufficiently display the eraser's function due to excellent letter erasing performance.

Description

Non-FVC Eraser Composition

The present invention relates to a non-fibse eraser composition, and more particularly, thermoplastic elastomer, wax, mineral oil, calcium carbonate (CaCO ₃ ), consisting of styrene-butadiene-styrene, nitrile butadiene rubber and polystyrene copolymer, A non-fibse eraser composition comprising magnesium oxide (MgO) and titanium dioxide (TiO ₂ ).

Generally, the eraser is made of polyvinyl chloride called PVC.

Although polyvinyl chloride is known as one of environmentally harmful substances, it is basically used in almost all plastic products encountered in the life, and it is a level that does not affect health very much because only a very small amount of environmentally harmful substances and environmental hormones are detected. .

The vinyl chloride resin is a hybrid polymer containing at least 50% of a vinyl chloride homopolymer and vinyl chloride, and is one of five general-purpose thermoplastic resins produced by suspension polymerization and emulsion polymerization. The vinyl chloride resin is molded by various processing methods such as compound extrusion molding, injection molding, calendering, sol molding, and the like, such as pipes, building interior and exterior materials, electric wires, electric machine products, toys, films, sheets, artificial leather, and tapes. It is widely used as a material for a variety of products, from food packaging to medical supplies.

PVC resin is used for various purposes because of its excellent water resistance, chemical resistance, and flame retardancy.However, since the resin is incompletely burned, it is polluted, causing dioxin, which causes environmental pollution. The trend is.

The vinyl chloride resin may be imparted with various additives by appropriately adding various additives such as plasticizers, secondary plasticizers, stabilizers, pigments, fillers, blowing agents, lubricants, and viscosity modifiers.

Plasticizers are additives that play a role of improving the processability by reducing the friction coefficient between polymer resins. The types of plasticizers used up to now are very diverse in their types and their uses are different. Plasticizers used in vinyl chloride resins are mainly phthalate plasticizers, especially DEHP (Di-2-EthylHexyl Phthalate), DBP (Di-Butyl Phthalate), DIDP (Di-IsoDecyl Phthalate), BBP (Butyl Benzyl Phthalate), DINP (Di-IsoNonyl Phthalate) and DNOP (Di-n-Octyl Phthalate) are the most widely used. In particular, diethylhexyl phthalate is widely used because it has a good balance of physical properties such as plasticization efficiency and cold resistance.

However, phthalate-based plasticizers are suspected as endocrine disruptors, or environmental hormones, which enter or interfere with the hormonal action of animals or humans, including diethylhexyl phthalate (DEHP) and dibutyl phthalate. (DBP) is particularly dangerous and subject to regulation, requiring alternatives. In addition, DEHP has a low molecular weight and poor heat resistance, which can be easily transformed by heat, causing a demand for alternative materials.

As the erasers used in the related art, vinyl chloride erasers, elastomeric erasers and natural rubber erasers are known. Of these, natural rubber erasers are rarely used due to problems in durability, and elastomeric erasers are not used much due to limitations in their ability to erase. Vinyl chloride erasers are mainly used because of their excellent ability to erase letters, but the development of replacement erasers is urgent due to environmental adverse effects and plasticizer performance by phthalic acid-based plasticizers, especially DEHP and DBP. It is true.

In order to solve the problems of the prior art as described above, the present invention does not use any PVC (polyvinyl chloride) used in the conventional eraser is not toxic and harmless to the human body can be used safely in children, do not emit environmental hormones Therefore, an object of the present invention is to provide an environmentally friendly non-fibse eraser composition.

In addition, an object of the present invention is to provide a non-fibrous eraser composition which is non-toxic and has excellent letter erasing performance and can sufficiently exhibit the original function of the eraser.

In order to achieve the above object, the present invention is a thermoplastic elastomer, wax, mineral oil, calcium carbonate (CaCO ₃ ), magnesium oxide (MgO) and titanium dioxide composed of styrene-butadiene-styrene, nitrile butadiene rubber and polystyrene copolymer It provides a (non-fib) C eraser composition comprising (TiO ₂ ).

Preferably, the eraser composition is 10 to 40% by weight of thermoplastic elastomer consisting of 6 to 15% by weight of styrene-butadiene-styrene, 5 to 15% by weight of nitrile butadiene rubber and 1 to 6% by weight of polystyrene copolymer, and 1 to wax. 5 wt%, mineral oil 5-20 wt%, calcium carbonate (CaCO ₃ ) 50-70 wt%, magnesium oxide (MgO) 0.1-5 phr and titanium dioxide (TiO ₂ ) 0.5-5 phr.

Eraser according to the present invention does not use any PVC (polyvinyl chloride) used in the conventional eraser is not toxic and harmless to the human body can be used with confidence, it does not emit environmental hormones environmentally friendly at the same time erase performance It is excellent in this and can fully exhibit the eraser original function.

Hereinafter, the present invention will be described in detail.

Since the eraser composition of the present invention does not use the PVC used in the conventional eraser, no harmful substances such as phthalate-based plasticizers, formaldehyde, and lead are detected, and thus non-toxic children can be used safely, and do not emit environmental hormones. It is environmentally friendly. In addition, the non-fib C eraser composition of the present invention is excellent in the erase performance, even compared to the conventional PVC eraser can fully exhibit the original function of the eraser.

The non-fibse eraser composition of the present invention is a thermoplastic elastomer consisting of styrene-butadiene-styrene, nitrile butadiene rubber and polystyrene copolymer, wax, mineral oil, calcium carbonate (CaCO ₃ ), magnesium oxide (MgO) and dioxide Titanium (TiO ₂ ).

The thermoplastic elastomer is a polymer material having a rubber elasticity such as vulcanized rubber at room temperature, melt plasticized when heated to high temperature, and can be molded into a conventional plastic molding machine.

The thermoplastic elastomer used in the present invention may be used by mixing a styrene-butadiene-styrene (SBS, stylene-butadiene-stylene) and nitrile butadiene rubber (NBR, nitrile butadiene rubber) and polystyrene (PS, polystylene) copolymer have.

The styrene-butadiene-styrene acts to give elasticity to the eraser. The styrene-butadiene-styrene is preferably included in the eraser composition in 6 to 15% by weight. If the content is less than 6% by weight, it is impossible to generate the styrene block to impart elasticity, so that the final eraser is brittle, and the shape cannot be maintained due to cold flow phenomenon at room temperature. In addition, when it exceeds 15% by weight, the elasticity and strength of the eraser may increase, and dust may not be separated.

The nitrile butadiene rubber acts to impart viscosity to the eraser. The nitrile butadiene rubber is preferably included in the eraser composition 5 to 15% by weight. If the content is less than 5% by weight, the viscosity of the eraser is lost and the dust of the eraser does not aggregate.If the content exceeds 15% by weight, the elongation is increased in proportion to the viscosity of the eraser. It may not be separated as well.

The polystyrene is preferably contained in 1 to 6% by weight in the eraser composition. If the content is less than 1% by weight, the eraser (erasing performance) of the eraser may be weakened. If the content exceeds 6% by weight, the eraser may not be used beyond the allowable range of hardness.

The thermoplastic elastomer consisting of styrene-butadiene-styrene, nitrile butadiene rubber and polystyrene copolymers contained in the above content is preferably included in the eraser composition in an amount of 10 to 40% by weight. When the content is within the above range, it is possible to impart an appropriate hardness to the eraser produced.

The thermoplastic elastomer may be a styrene-butadiene copolymer (SBR), a styrene-isoprene copolymer, a styrene-ethylene-butadiene (styrene) in addition to styrene-butadiene-styrene, nitrile butadiene rubber and polystyrene copolymer. It can also be used in combination with a styrene-based thermoplastic resin or thermoplastic elastomer such as -ethylene-buthylene copolymer, styrene-ethylene-propylene copolymer.

It is preferable that the wax is liquid, and the other composition entering the eraser lowers the melting temperature, thereby lowering the processing temperature of the product and providing flowability.

It is preferable that the wax is included in the eraser composition in an amount of 1 to 5% by weight. If the content is within the above range, the wax may be provided with an appropriate processing temperature and flowability, and the hardness of the eraser may be properly maintained.

The mineral oil acts as a softener, the content of which is preferably contained in 5 to 20% by weight in the eraser composition. When the mineral oil is within the above range, an appropriate amount of mineral oil may be used to soften properly without bleeding out when the eraser is manufactured.

The calcium carbonate (CaCO ₃ ), magnesium oxide (MgO) and titanium dioxide (TiO ₂ ) is used as a filler, respectively, in addition to the calcium carbonate, magnesium oxide and titanium dioxide, silica, alumina, diatomaceous earth, glass, talc, It can also be used in combination with conventional fillers such as sericite, quartz powder, montmorillonite, scallops, oyster shells, clam shell powder, egg shell powder, organic hollow particles, inorganic hollow particles.

The calcium carbonate (CaCO ₃ ), magnesium oxide (MgO) and titanium dioxide (TiO ₂ ) is preferably included in the eraser composition 50 to 70% by weight, 0.1 to 5phr, 0.5 to 5phr. When the content is in the above range, sufficient rubber elasticity is expressed, and the eraser can achieve the maximum erase performance.

The non-fibse eraser composition of the present invention composed of the above components may contain, in addition to the above components, a softener such as process oil, polybutylene, polychlorinated paraffin, macerated paraffin, colorants, A fragrance, a stabilizer, a lubricant, a thermoplastic resin or thermoplastic elastomer other than the above-described styrene-butadiene-styrene, nitrile butadiene rubber, and polystyrene copolymer may be further included.

The non-fibrous eraser of the present invention using the above-described eraser composition is molded into a product by press molding, injection molding, extrusion molding, etc., and cutting the eraser composition.

Specifically, the eraser composition is extruded at a molding speed of 15 to 25 rpm at a cylinder temperature of 65 to 85 ° C., a die temperature of 50 to 60 ° C., and a head temperature of 60 to 70 ° C., and cut to a predetermined dimension to provide the present invention. Non-fibse eraser can be prepared.

The non-fibrous eraser of the present invention obtained as described above is excellent in letter erasing performance without using vinyl chloride resin (PVC), and thus can sufficiently exhibit the original function of the eraser. In addition, no harmful substances such as phthalate-based plasticizers, formaldehyde, lead, etc. are detected, non-toxic children can safely use, it does not emit environmental hormones, it is environmentally friendly.

Hereinafter, the present invention will be described in more detail with reference to Examples. These examples are for illustrative purposes only and are not intended to limit the protection scope of the present invention.

Example 1

10% by weight of styrene-butadiene-styrene, 7% by weight of nitrile butadiene rubber, 2% by weight of polystyrene and 3% by weight of wax, 15% by weight of mineral oil, 63% by weight of calcium carbonate (CaCO ₃ ), magnesium oxide ( 2phr of MgO) and 2phr of titanium dioxide (TiO ₂ ) were kneaded and extruded at a molding speed of 15 to 25 rpm at a cylinder temperature of 65 to 85 ° C, a die temperature of 50 to 60 ° C, and a head temperature of 60 to 70 ° C. FVC eraser was prepared.

Example 2

13% by weight of styrene-butadiene-styrene, 6% by weight of nitrile butadiene rubber, 3% by weight of polystyrene and 2% by weight of wax, 15% by weight of mineral oil, 61% by weight of calcium carbonate (CaCO ₃ ), magnesium oxide ( 2phr of MgO) and 2phr of titanium dioxide (TiO ₂ ) were kneaded and extruded at a molding speed of 15 to 25 rpm at a cylinder temperature of 65 to 85 ° C, a die temperature of 50 to 60 ° C, and a head temperature of 60 to 70 ° C. FVC eraser was prepared.

Comparative Example 1

Cylinder temperature 65 ~ 85 after kneading 26% by weight of polyvinyl chloride (PVC) resin, 30% by weight of natural plasticizer, 44% by weight of calcium carbonate (CaCO ₃ ), 2phr of magnesium oxide (MgO) and 2phr of titanium dioxide (TiO ₂ ) A PVC eraser was prepared by extrusion molding at a molding speed of 18 to 30 rpm at a temperature of 50 ° C., a die temperature of 50 ° C. to 60 ° C., and a head temperature of 60 ° C. to 70 ° C.

Comparative Example 2

18% by weight of styrene-butadiene-styrene, 6% by weight of nitrile butadiene rubber, 3% by weight of polystyrene and 2% by weight of wax, 15% by weight of mineral oil, 56% by weight of calcium carbonate (CaCO ₃ ), magnesium oxide ( ₂ phr of MgO) and ₂ phr of titanium dioxide (TiO ₂ ) were kneaded and then extruded at a molding speed of 15 to 25 rpm at a cylinder temperature of 65 to 85 ° C., a die temperature of 50 to 60 ° C., and a head temperature of 60 to 70 ° C. FV C Eraser was prepared.

Comparative Example 3

10% by weight of styrene-butadiene-styrene, 4% by weight of nitrile butadiene rubber, 3% by weight of polystyrene and 3% by weight of wax, 15% by weight of mineral oil, 65% by weight of calcium carbonate (CaCO ₃ ), magnesium oxide ( 2phr of MgO) and 2phr of titanium dioxide (TiO ₂ ) were kneaded and extruded at a molding speed of 15 to 25 rpm at a cylinder temperature of 65 to 85 ° C, a die temperature of 50 to 60 ° C, and a head temperature of 60 to 70 ° C. FVC eraser was prepared.

Comparative Example 4

8% by weight of styrene-butadiene-styrene, 16% by weight of nitrile butadiene rubber, 1% by weight of polystyrene and 2% by weight of wax, 10% by weight of mineral oil, 63% by weight of calcium carbonate (CaCO ₃ ), magnesium oxide ( 2phr of MgO) and 2phr of titanium dioxide (TiO ₂ ) were kneaded and extruded at a molding speed of 15 to 25 rpm at a cylinder temperature of 65 to 85 ° C, a die temperature of 50 to 60 ° C, and a head temperature of 60 to 70 ° C. FVC eraser was prepared.

Comparative Example 5

10% by weight of styrene-butadiene-styrene, 7% by weight of nitrile butadiene rubber, 0% by weight of polystyrene and 2% by weight of wax, 18% by weight of mineral oil, 63% by weight of calcium carbonate (CaCO ₃ ), magnesium oxide ( ₂ phr of MgO) and ₂ phr of titanium dioxide (TiO ₂ ) were kneaded and then extruded at a molding speed of 15 to 25 rpm at a cylinder temperature of 65 to 85 ° C., a die temperature of 50 to 60 ° C., and a head temperature of 60 to 70 ° C. FVC eraser was prepared.

Comparative Example 6

10% by weight of styrene-butadiene-styrene, 6% by weight of nitrile butadiene rubber, 8% by weight of polystyrene and 2% by weight of wax, 14% by weight of mineral oil, 60% by weight of calcium carbonate (CaCO ₃ ), magnesium oxide ( 2phr of MgO) and 2phr of titanium dioxide (TiO ₂ ) were kneaded and extruded at a molding speed of 15 to 25 rpm at a cylinder temperature of 65 to 85 ° C, a die temperature of 50 to 60 ° C, and a head temperature of 60 to 70 ° C. FVC eraser was prepared.

Comparative Example 7

10% by weight of styrene-butadiene-styrene, 6% by weight of nitrile butadiene rubber, 2% by weight of polystyrene and 0% by weight of wax, 17% by weight of mineral oil, 65% by weight of calcium carbonate (CaCO ₃ ), magnesium oxide ( 2phr of MgO) and 2phr of titanium dioxide (TiO ₂ ) were kneaded and extruded at a molding speed of 15 to 25 rpm at a cylinder temperature of 65 to 85 ° C, a die temperature of 50 to 60 ° C, and a head temperature of 60 to 70 ° C. FVC eraser was prepared.

Comparative Example 8

5% by weight of styrene-butadiene-styrene, 5% by weight of nitrile butadiene rubber, 1% by weight of polystyrene and 2% by weight of wax, 22% by weight of mineral oil, 65% by weight of calcium carbonate (CaCO ₃ ), magnesium oxide ( 2phr of MgO) and 2phr of titanium dioxide (TiO ₂ ) were kneaded and extruded at a molding speed of 15 to 25 rpm at a cylinder temperature of 65 to 85 ° C, a die temperature of 50 to 60 ° C, and a head temperature of 60 to 70 ° C. FVC eraser was prepared.

Comparative Example 9

8% by weight of styrene-butadiene-styrene, 5% by weight of nitrile butadiene rubber, 2% by weight of polystyrene and 2% by weight of wax, 13% by weight of mineral oil, 70% by weight of calcium carbonate (CaCO ₃ ), magnesium oxide ( 2phr of MgO) and 2phr of titanium dioxide (TiO ₂ ) were kneaded and extruded at a molding speed of 15 to 25 rpm at a cylinder temperature of 65 to 85 ° C, a die temperature of 50 to 60 ° C, and a head temperature of 60 to 70 ° C. FVC eraser was prepared.

Table 1

ingredient	Example 1	Example 2	Comparative Example 2	Comparative Example 3	Comparative Example 4	Comparative Example 5	Comparative Example 6	Comparative Example 7	Comparative Example 8	Comparative Example 9
SBS	10	13	18	10	8	10	10	10	5	8
NBR	7	6	6	4	16	7	6	6	5	5
PS	2	3	3	3	One	0	8	2	One	2
Wax	3	2	2	3	2	2	2	0	2	2
Oil	15	15	15	15	10	18	14	17	22	13
CaCO ₃	63	61	56	65	63	63	60	65	65	70
Total	100	100	100	100	100	100	100	100	100	100
TiO ₂ (phr)	2	2	2	2	2	2	2	2	2	2
MgO (phr)	2	2	2	2	2	2	2	2	2	2

Using the erasers prepared in Examples 1 to 2 and Comparative Examples 1 to 9, the appearance state, color, erase rate, paper wrinkle, hardness, transferability, residue generation degree and molding performance were measured, and the results are shown in the following table. 2 and Table 3.

TABLE 2

Evaluation item	Example 1	Example 2	Comparative Example 1
Appearance	Good	Good	Good
color	White	White	White
Erase rate	90	90	97
Paper crumpled	Good	Good	Good
Hardness	65	70	73
Performance	Good	Good	Good
leftover	4 ~ 6	5	One
Molding performance	Good	Good	Good

TABLE 3

division	Example 1	Example 2	Comparative Example 2	Comparative Example 3	Comparative Example 4	Comparative Example 5	Comparative Example 6	Comparative Example 7	Comparative Example 8	Comparative Example 9
Appearance	Good	Good	Good	Good	Good	Good	Good	Bad	Bad	Bad
color	White	White	White	White	White	White	White	White	White	White
Erase rate	90	90	85	85	75	60	90	80	80	70
Crumpled up paper	Good	Good	Good	Good	Good	Good	Good	Good	Good	Good
Hardness	65	70	70	60	75	40	90	50	35	70
Performance	Good	Good	Good	Good	Good	Bad	Good	Bad	Bad	Good
leftover	4 ~ 6	5	4	2	3	One	many	5	One	6
Molding performance	Good	Good	Good	Good	Good	Good	Good	Bad	Bad	Bad

As shown in Table 1 and Table 3, the erasers of Examples 1 and 2 according to the present invention are compared with Comparative Examples 1 to 9 in appearance, color, erase rate, paper wrinkle degree, hardness, transferability, Excellent results were obtained in terms of residue generation and molding performance.

Although the present invention has been described as the preferred embodiment mentioned above, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. The appended claims also cover such modifications and variations as fall within the spirit of the invention.

Claims

Thermoplastic elastomers composed of styrene-butadiene-styrene, nitrile butadiene rubber and polystyrene copolymers;

Wax;

Mineral oils;

Calcium carbonate (CaCO 3 );

Magnesium oxide (MgO); And

Titanium dioxide (TiO 2 );

Non-fib C eraser composition comprising a.
The method of claim 1,

10 to 40% by weight of thermoplastic elastomer composed of 6 to 15% by weight of styrene-butadiene-styrene, 5 to 15% by weight of nitrile butadiene rubber and 1 to 6% by weight of polystyrene copolymer;

1 to 5 weight percent wax;

Mineral oil 5-20% by weight;

Calcium carbonate (CaCO 3 ) 50-70% by weight;

Magnesium oxide (MgO) 0.1-5 phr; And

Titanium dioxide (TiO 2 ) 0.5-5phr;

Non-fib C eraser composition comprising a.
The method of claim 1,

The eraser composition may be used in thermoplastic resins or thermoplastic elastomers other than fillers, process oils, polybutylenes, softeners, colorants, flavoring agents, stabilizers, lubricants, and styrene-butadiene-styrene and ethylene-propylene copolymers. The non-fib C eraser composition further comprises any one or more additives selected.
The method of claim 1,

The eraser composition is extruded at a molding speed of 15-25 rpm at a temperature of 65 to 85 ° C., a die temperature of 50 to 60 ° C., and a head temperature of 60 to 70 ° C.