JP3462924B2 - Degradable writing instrument - Google Patents
Degradable writing instrumentInfo
- Publication number
- JP3462924B2 JP3462924B2 JP04483695A JP4483695A JP3462924B2 JP 3462924 B2 JP3462924 B2 JP 3462924B2 JP 04483695 A JP04483695 A JP 04483695A JP 4483695 A JP4483695 A JP 4483695A JP 3462924 B2 JP3462924 B2 JP 3462924B2
- Authority
- JP
- Japan
- Prior art keywords
- writing instrument
- cap
- molecular weight
- tip
- barrel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Biological Depolymerization Polymers (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、分解性筆記具に係り、
詳しくは廃棄物として土中や水中に投棄されることで、
紙や木材等の天然物と同じように自然環境下で微生物の
働きにより無害な炭酸ガス(CO2 )と水(H2 O)に
生分解されて自然に戻される乳酸系の分解性筆記具に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a degradable writing instrument,
For details, by dumping it in the soil or water as waste,
The present invention relates to a lactic acid-based degradable writing instrument that is biodegraded into harmless carbon dioxide gas (CO 2 ) and water (H 2 O) by the action of microorganisms in a natural environment like a natural product such as paper or wood and is returned to nature. It is a thing.
【0002】[0002]
【従来の技術】近年、廃棄プラスチックの処理問題に対
する回答の一つとして話題になっている生分解性プラス
チックが脚光を浴びている。この生分解性プラスチック
は土中や水中に投棄されると、紙や木材等の天然物と同
じように自然環境下で土中や水中の微生物の働きにより
無害な炭酸ガスと水に生分解されて自然に戻される自然
に優しい生分解性材料として世界的に注目されており、
その実用化が望まれている。2. Description of the Related Art In recent years, biodegradable plastics, which have been talked about as one of the answers to the problem of disposal of waste plastics, are in the spotlight. When this biodegradable plastic is dumped in soil or water, it is biodegraded into harmless carbon dioxide gas and water by the action of microorganisms in the soil or water in the natural environment like natural products such as paper and wood. It is attracting worldwide attention as a natural, biodegradable material that is returned to nature.
Its practical application is desired.
【0003】[0003]
【発明が解決しようとする課題】ところで、ボールペン
やサインペン等の筆記具類はプラスチック成型品である
が、生分解性プラスチックを用いて成形されたこれらの
筆記具類は知られていない。従って、プラスチック製の
ボールペンやサインペン等が不要となって自然に投棄さ
れた場合、分解されずに残骸として半永久的に残り、環
境保全に対する必要性と意識が高まってきている近代社
会において問題視されている。そのために、従来では廃
棄プラスチックの処理としては焼却に依存しているとこ
ろが多く、焼却処理を行った場合、プラスチック特有の
有害な臭気や黒煙(有害ガス)等の発生量が多く、問題
となる。By the way, writing instruments such as ballpoint pens and felt-tip pens are plastic molded products, but these writing instruments molded using biodegradable plastic are not known. Therefore, when plastic ballpoint pens, felt-tip pens, etc. are no longer needed and are dumped naturally, they remain as debris semi-permanently without being decomposed, which is regarded as a problem in modern society where the need and awareness for environmental conservation are increasing. ing. Therefore, in the past, waste plastics often depended on incineration, and when incinerated, the amount of harmful odors and black smoke (poisonous gas) peculiar to plastics was large, which was a problem. .
【0004】本発明はこの様な従来事情に鑑みてなされ
たもので、筆記具として要求される筆記時の筆圧等に対
する強度(材料強度)を有し、一方不要となって投棄さ
れた時には自然環境下で容易に分解して自然に戻される
分解性筆記具を提供することを目的とする。然るに、本
発明者らは紙や木材等の天然物と同じように自然環境下
で分解が可能で、しかも筆記時の筆圧等に対する強度を
有する筆記具を得る目的で、種々の研究を行ってきた結
果、前記分解性を損なうことなく、しかも分子量の増減
コントロールにより材料物性の硬度調整が可能な生分解
材料としてポリ乳酸に着目し、本発明の完成に至ったも
のである。The present invention has been made in view of such conventional circumstances, and has strength (material strength) against writing pressure and the like required for writing as a writing instrument, while it is natural when it is discarded as unnecessary. An object of the present invention is to provide a degradable writing instrument that is easily decomposed in an environment and is returned to nature. However, the present inventors have conducted various studies for the purpose of obtaining a writing instrument that can be decomposed in a natural environment like natural products such as paper and wood and has strength against writing pressure at the time of writing. As a result, the present invention has been completed by paying attention to polylactic acid as a biodegradable material capable of adjusting the hardness of material physical properties by controlling the increase or decrease of the molecular weight without impairing the degradability.
【0005】[0005]
【課題を達成するための手段】上記目的を達成するため
に本発明が講じる技術的手段は、先端口が装着されてい
る軸筒と、該軸筒の先端に装着されるキャップとを具備
してなる分解性筆記具において、前記軸筒、前記先端口
及び前記キャップを、分子量が5万〜30万までコントロ
ール可能なポリ乳酸から形成するとともに、前記キャッ
プを形成するポリ乳酸の分子量を、前記軸筒及び前記先
端口を形成するポリ乳酸の分子量よりも減らしたことを
特徴とする。また、本発明の他の技術的手段は、上記軸
筒及び上記先端口を硬質タイプに成形するとともに、上
記キャップを軟質タイプに成形したことを特徴とする。 [Means for Achieving the Object] The technical means taken by the present invention to achieve the above-mentioned object is equipped with a tip opening.
And a cap attached to the tip of the barrel.
A decomposable writing instrument comprising: the barrel, the tip opening
And the cap, with the molecular weight to form a controllable polylactic to 50,000 to 300,000, wherein the cap
The molecular weight of the polylactic acid forming the
That the molecular weight of the polylactic acid that forms the end opening is reduced
Characterize. Another technical means of the present invention is the above shaft.
While molding the cylinder and the above-mentioned tip opening into a rigid type,
It is characterized in that the cap is molded into a soft type.
【0006】[0006]
【作 用】而して、上記した本発明の技術的手段によ
れば、5万〜30万の範囲内で分子量の増減コントロール
により軟質タイプから硬質タイプのポリ乳酸が得られ
る。それにより、筆記具に要求される特に筆記時の筆圧
等に対する強度が得られる。一方、不要になって投棄さ
れた場合には紙や木等の天然物と同じように自然環境下
で土中や水中の微生物の働きにより無害な炭酸ガスと水
に分解されて自然に戻される。しかも、乳酸系であるこ
とから、安全性が高い。[Operation] Thus, according to the above-mentioned technical means of the present invention, soft to hard polylactic acid can be obtained by controlling the increase or decrease of the molecular weight within the range of 50,000 to 300,000. As a result, the strength required for a writing instrument, especially for writing pressure during writing, can be obtained. On the other hand, when it is no longer needed and is discarded, it is decomposed into harmless carbon dioxide gas and water by the action of microorganisms in the soil and water in the natural environment, and returned to nature just like natural products such as paper and wood. . Moreover, since it is a lactic acid type, it is highly safe.
【0007】[0007]
【実 施 例】本発明の実施の一例を以下説明すると、
本発明で用いるポリ乳酸は乳酸を主材料として、これに
透明性の高い熱可塑性プラスチックを化学反応により共
重合させた組成からなる生分解性プラスチックであり、
その分子量の増減コントロールは自然界における土中や
水中の微生物の働きによる分解性と材料として強度を要
求することから、本発明においてはポリ乳酸の分子量を
5万〜30万の範囲内に抑える。即ち、本発明に求められ
ることは筆記時の筆圧等に対する強度を有し、しかも自
然環境下での分解性が得られる双方の効果を維持する必
要があることから、分子量を5万〜30万の範囲内に抑え
る。[Example] An example of the implementation of the present invention will be described below.
The polylactic acid used in the present invention is a biodegradable plastic having a composition in which lactic acid is a main material and a highly transparent thermoplastic resin is copolymerized by a chemical reaction,
Controlling the increase or decrease of the molecular weight requires degradability due to the action of microorganisms in soil or water in nature and requires strength as a material, and therefore the molecular weight of polylactic acid is suppressed within the range of 50,000 to 300,000 in the present invention. That is, what is required of the present invention is to have strength against writing pressure at the time of writing, and to maintain both effects of obtaining decomposability in a natural environment. Therefore, the molecular weight is 50,000 to 30. Keep within the range of 10,000.
【0008】乳酸は、トウモロコシ、ジャガイモ、ブド
ウ糖などを発酵させて得るものである。その発酵法とし
ては例えばトウモロコシやジャガイモの澱粉を原料とし
た場合、まず麦芽で澱粉を糖化し、これにその半量のC
aCO2 を加え、次に麦芽汁に培養した純粋の乳酸菌を
加えて発酵させる。更に、弱アルカリ性を呈するまで石
灰乳を加えて煮沸し、冷却後少量の熱湯から再結晶し、
50%硫酸を加えて分解して石こうをろ別し、最後にろ液
を減圧下で蒸発濃縮することで乳酸を得ることができ
る。そして、この乳酸を主材料として、ポリエステル類
の熱可塑性プラスチックと反応させて共重合させた分子
量が5万〜30万までコントロールが可能なポリ乳酸が得
られる。Lactic acid is obtained by fermenting corn, potato, glucose and the like. As a fermentation method, for example, when corn or potato starch is used as a raw material, first, malt is used to saccharify the starch, and a half amount of C
aCO 2 is added, and then pure lactic acid bacteria cultured in wort are added and fermented. Furthermore, lime milk is added and boiled until it exhibits weak alkalinity, and after cooling, recrystallized from a small amount of hot water,
Lactic acid can be obtained by adding 50% sulfuric acid to decompose and separating gypsum, and finally evaporating and concentrating the filtrate under reduced pressure. Then, using this lactic acid as a main material, it is possible to obtain polylactic acid which is copolymerized by reacting with a thermoplastic such as polyester and whose molecular weight can be controlled from 50,000 to 300,000.
【0009】次に、このポリ乳酸を用いた筆記具の実施
の一例を図面に基づいて説明すると、図中1は軸筒、2
はキャップ、3は先端口、4は尾栓、5は替芯であり、
これらは周知の形状を成す。Next, an example of the implementation of the writing instrument using this polylactic acid will be explained with reference to the drawings. In FIG.
Is a cap, 3 is a tip opening, 4 is a tail plug, 5 is a refill,
These have known shapes.
【0010】即ち、軸筒1及び先端口3は材料の物性が
硬質タイプになる様に5万〜30万の範囲でコントロール
した分子量のポリ乳酸にて成形する。それにより、軸筒
1及び先端口3に要求される筆記時の強度が得られ、軸
筒1は使用者の筆圧等により撓むなどの変形を起こすこ
となく直線的な軸形態に保たれる。同じく先端口3は突
出する替芯5のチップ5-1 を筆圧時にガタ付かない様に
しっかりと保持する。そして、キャップ2の場合は材料
に適度の弾性が得られる軟質タイプになる様に5万〜30
万の範囲内でコントロールした分子量のポリ乳酸にて成
形する。即ち、軸筒1とは逆に軸筒1を成形した場合の
分子量よりもポリ乳酸の分子量を減らす。それにより、
先端口3が装着されている軸筒1の先端に対してキャッ
プ2を密接させた状態で装着し得、その装着安定性が図
られる。又、尾栓4を5万〜30万の範囲内で増減コント
ロールした分子量のポリ乳酸にて成形するThat is, the barrel 1 and the tip end port 3 are molded with polylactic acid having a molecular weight controlled in the range of 50,000 to 300,000 so that the physical properties of the material are hard type. As a result, the required strength for writing on the barrel 1 and the tip opening 3 is obtained, and the barrel 1 is kept in a linear shaft form without being deformed such as being bent by the writing pressure of the user. Be done. Similarly, the tip opening 3 firmly holds the tip 5-1 of the extra core 5 protruding so as not to rattle during writing pressure. And in the case of the cap 2, it is 50,000 to 30 so that it is a soft type that can obtain appropriate elasticity for the material
Mold with polylactic acid having a controlled molecular weight within the range of 10,000. That is, the molecular weight of polylactic acid is reduced from the molecular weight when the barrel 1 is molded in the opposite manner to the barrel 1. Thereby,
The cap 2 can be mounted in a state in which the cap 2 is in close contact with the tip of the barrel 1 to which the tip port 3 is mounted, and the mounting stability is achieved. Further, the tail plug 4 is molded with polylactic acid having a controlled molecular weight within the range of 50,000 to 300,000.
【0011】尚、替芯5のインクタンク5-2 をポリ乳酸
により生分解可能に形成するも勿論自由である。又、チ
ップ5-1 においてもその成形が可能であるならばポリ乳
酸で形成するも良い。Of course, the ink tank 5-2 of the refill 5 may be formed of polylactic acid so as to be biodegradable. Also, if the chip 5-1 can be molded, polylactic acid may be used.
【0012】従って、本発明の分解性筆記具によれば、
分子量を5万〜30万の範囲で増減コントロールする。即
ち共重合組成をコントロールすることで、例えばポリエ
チレン(PE)のような軟質タイプからポリスチレン
(PS)のような硬質タイプまで可能なポリ乳酸により
軸筒1、キャップ2、先端口3、尾栓4等を成形してな
ることから、筆記具として要求される筆記時の筆圧等に
より撓む等の虞れがない強度(材料強度)にて軸筒1を
成形する事ができる。そして、キャップ2は適度の弾性
を持たせた状態で成形する事ができる。一方、不要にな
って土中や水中等に投棄された場合には軸筒1、キャッ
プ2、先端口3、尾栓4等は土中や水中の微生物の働き
により紙や木等の天然物と同じように自然環境下で無害
な炭酸ガスと水に分解されて自然に戻される。Therefore, according to the degradable writing instrument of the present invention,
The molecular weight is controlled to increase or decrease within the range of 50,000 to 300,000. That is, by controlling the copolymerization composition, for example, a polylactic acid capable of varying from a soft type such as polyethylene (PE) to a hard type such as polystyrene (PS) is used as the barrel 1, the cap 2, the tip end opening 3, and the tail plug 4. Since these are molded, the barrel 1 can be molded with a strength (material strength) that is not likely to bend due to a writing pressure or the like required for writing as a writing instrument. Then, the cap 2 can be molded in a state where it has an appropriate elasticity. On the other hand, when it is no longer needed and is dumped in the soil or water, the barrel 1, cap 2, tip end 3, tail plug 4, etc. are natural products such as paper and wood due to the action of microorganisms in the soil and water. Like in the natural environment, it is decomposed into harmless carbon dioxide and water and returned to nature.
【0013】[0013]
【発明の効果】本発明の分解性筆記具は叙上の如く、分
子量を5万〜30万の範囲で増減コントロールすることで
軟質タイプから硬質タイプまで可能なポリ乳酸から形成
してなることから、下記の作用効果を奏する。筆記具と
して要求される筆記時の強度が十二分に得られる一方
で、不要になって投棄された場合には紙や木材等の天然
物と同じように自然環境下で土中や水中の微生物の働き
により無害な炭酸ガスと水に分解されて自然に戻され
る。As described above, the degradable writing instrument of the present invention is formed from polylactic acid capable of varying from a soft type to a hard type by controlling the molecular weight in the range of 50,000 to 300,000. The following operational effects are achieved. While the strength required for writing as a writing instrument is more than sufficient, when it is no longer needed and is thrown away, microorganisms in the soil or water under the natural environment are treated like natural products such as paper and wood. Is decomposed into harmless carbon dioxide gas and water and returned to nature.
【0014】従って、本発明の分解性筆記具によれば、
筆記具として要求される筆記時の筆圧等に対する強度
(材料強度)を有することから、筆記具としての実用化
が可能となる。一方、不要となって投棄された時には自
然環境下で容易に分解して自然に戻される。よって、環
境保全に対する必要性と意識が高まってきている近代社
会において問題視されている廃棄プラスチックの廃棄物
処理問題の一つの回答とも言える画期的な筆記具とな
る。しかも、乳酸系を用いていることから、安全性が高
く、自然に優しい分解性筆記具となる。その上、軸筒の
先端に対してキャップを密接させた状態で装着し得、そ
の装着安定性が図られる。 Therefore, according to the degradable writing instrument of the present invention,
Since it has the strength (material strength) with respect to the writing pressure at the time of writing required as a writing instrument, it can be put to practical use as a writing instrument. On the other hand, when it is no longer needed and is discarded, it is easily decomposed in the natural environment and returned to nature. Therefore, it is an epoch-making writing instrument that can be said to be one of the answers to the problem of waste disposal of waste plastic, which is regarded as a problem in modern society where the necessity and consciousness for environmental conservation are increasing. Moreover, since it is made of lactic acid, it is a safe and naturally degradable writing instrument. Besides,
You can attach the cap in close contact with the tip, and
The mounting stability of the can be achieved.
【図1】 本発明分解性筆記具の実施の一例を示した断
面図FIG. 1 is a cross-sectional view showing an example of implementation of the degradable writing instrument of the present invention.
1…軸筒 2…キャップ 3…先端口 4…尾栓 5…替芯 5-1 …チップ 5-2 …インクタンク 1… Shaft cylinder 2… Cap 3 ... Tip opening 4 ... Tail plug 5 ... Extra core 5-1 ... Chip 5-2 ... Ink tank
Claims (2)
の先端に装着されるキャップとを具備してなる分解性筆
記具において、 前記軸筒、前記先端口及び前記キャップを、 分子量が5
万〜30万までコントロール可能なポリ乳酸から形成する
とともに、 前記キャップを形成するポリ乳酸の分子量を、前記軸筒
及び前記先端口を形成するポリ乳酸の分子量よりも減ら
した ことを特徴とする分解性筆記具。1. A barrel having a tip opening attached thereto, and the barrel.
Decomposable brush having a cap attached to the tip of
In the writing instrument, the barrel, the tip end opening, and the cap have a molecular weight of 5
Forming a controllable polylactic acid until 10,000 to 300,000
Along with the molecular weight of the polylactic acid forming the cap,
And less than the molecular weight of the polylactic acid forming the tip mouth
Degradable writing instrument, characterized in that it has.
成形するとともに、上記キャップを軟質タイプに成形しAlong with molding, the cap is molded into a soft type.
たことを特徴とする請求項1記載の分解性筆記具。The degradable writing instrument according to claim 1, wherein
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP04483695A JP3462924B2 (en) | 1995-02-08 | 1995-02-08 | Degradable writing instrument |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP04483695A JP3462924B2 (en) | 1995-02-08 | 1995-02-08 | Degradable writing instrument |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08216582A JPH08216582A (en) | 1996-08-27 |
JP3462924B2 true JP3462924B2 (en) | 2003-11-05 |
Family
ID=12702564
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP04483695A Expired - Fee Related JP3462924B2 (en) | 1995-02-08 | 1995-02-08 | Degradable writing instrument |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3462924B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
MX2021005676A (en) * | 2018-12-18 | 2021-07-07 | SOCIéTé BIC | Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring. |
-
1995
- 1995-02-08 JP JP04483695A patent/JP3462924B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH08216582A (en) | 1996-08-27 |
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