JP2934339B2 - Matte acrylic resin laminated sheet - Google Patents
Matte acrylic resin laminated sheetInfo
- Publication number
- JP2934339B2 JP2934339B2 JP3126523A JP12652391A JP2934339B2 JP 2934339 B2 JP2934339 B2 JP 2934339B2 JP 3126523 A JP3126523 A JP 3126523A JP 12652391 A JP12652391 A JP 12652391A JP 2934339 B2 JP2934339 B2 JP 2934339B2
- Authority
- JP
- Japan
- Prior art keywords
- acrylic resin
- sheet
- laminated sheet
- talc
- surface layer
- 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 - Lifetime
Links
Landscapes
- Laminated Bodies (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は熱成形でも艶もどりしな
い艶消し性に優れたアクリル樹脂積層シートに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acrylic resin laminated sheet which does not lose its luster even in thermoforming and has excellent matting properties.
【０００２】[0002]
【従来の技術】アクリル樹脂シートは優れた透明性、耐
光性、成形加工性、機械的強度特性等多くの特長があ
り、これを生かして照明カバー、ＯＡ機器銘板、自販機
前面板、各種ディスプレイ、表示板等広い範囲の用途で
使用されている。この中で照明カバー分野では、シート
表面の光沢度を下げた艶消しシートが外観風合いが良い
ということで和風照明を中心に広く使用されている。こ
の艶消しシートはシートの表面に微細な凹凸模様が形成
されており、この凹凸面で光線が乱反射するために光沢
度の低下となり、外観が柔らかい感じのものが得られ
る。シート表面に凹凸を付ける方法は一般に押出シー
ト生産時にポリッシングロールにマットロール（表面に
微細な凹凸面を有するロール）を用いてシート面にロー
ルのマット面を転写させる方法とシリカ等の無機微粉
体又は架橋されたポリマー微粒子を添加することでシー
ト表面に微細な凹凸を形成させる方法とがある。しかし
ながら、前者のマットロールの転写で得られたシートは
熱成形を行うと凹凸面が消失し、その結果光沢が出ても
との艶消し状が失われる。又、後者の添加物を用いる方
法では所望の艶消し状を得るためには多量の添加剤を加
える必要があり、その場合、全光線透過率の低下や透明
感が損なわれ不利となる。2. Description of the Related Art Acrylic resin sheets have many features such as excellent transparency, light resistance, moldability, mechanical strength characteristics, and the like. Lighting covers, OA equipment nameplates, vending machine front panels, various displays, It is used in a wide range of applications such as display boards. Among them, in the field of lighting covers, matte sheets having a reduced gloss on the sheet surface are widely used mainly for Japanese style lighting because of their good appearance and texture. This matte sheet has a fine uneven pattern formed on the surface of the sheet, and light is irregularly reflected on the uneven surface, so that the glossiness is lowered, and a sheet having a soft appearance is obtained. In general, a method of forming a concavity and convexity on a sheet surface is a method of transferring a mat surface of a roll to a sheet surface using a mat roll (a roll having a fine concavo-convex surface) as a polishing roll during the production of an extruded sheet, and an inorganic fine powder such as silica. Alternatively, there is a method of forming fine irregularities on the sheet surface by adding crosslinked polymer fine particles. However, the sheet obtained by the former mat roll transfer loses the uneven surface when subjected to thermoforming, and consequently loses its original matte appearance even though it is glossy. In addition, in the latter method using additives, a large amount of additives must be added in order to obtain a desired matte state. In this case, the total light transmittance is reduced and the transparency is impaired, which is disadvantageous.
【０００３】[0003]
【本発明が解決しようとする課題】本発明の課題は熱成
形しても艶消しシートの表面の凹凸面の消失がなく、更
に添加物を多量に用いる事による欠点を防止した艶消し
性に優れたアクリル樹脂シートを提供することである。SUMMARY OF THE INVENTION An object of the present invention is to provide a matte sheet which does not lose the uneven surface of the matte sheet even by thermoforming, and furthermore, has a matte property which prevents defects caused by using a large amount of additives. An object is to provide an excellent acrylic resin sheet.
【０００４】[0004]
【課題を解決するための手段】本発明者らは上記課題を
解決する為、鋭意研究の結果アクリル樹脂の表層部にタ
ルク微粉体を一定量含有してアクリル樹脂層を設けるこ
とによって目的を達成することを見出し本発明の完成に
至った。すなわち本発明はアクリル樹脂層の表面に厚さ
10〜200μmでタルク微粉体含量7〜30重量％のアクリル
樹脂層を有する熱成形で艶もどりしない艶消し性に優れ
たアクリル樹脂積層シートに関するものである。本発明
の特長は高濃度のタルク微粉体を含んだアクリル樹脂層
を極く薄い層で基材のアクリル樹脂シートに積層させる
ことでシート表面に微細な凹凸面を形成させ、しかもこ
の凹凸面は熱成形でも消失することなく、むしろ増加し
表面光沢度を低下させることになった。本発明で用いる
タルク微粉体とは、天然に産する硅酸マグネシウムを主
成分とする板状結晶タルク原石（滑石）を機械粉砕して
得られる偏平形状した微粉体であり、その粒径は 1〜20
μのものが一般にあるが、本発明では好ましくは10〜20
μである。粒径がこれより小さいと表面のマット形成効
果が小さく、一方、粒径がこれより大きいときは表面の
マット面が粗くなりザラ目状となる。表層部を形成する
樹脂中のタルク微粉体の含量は 5〜30重量％である必要
があり、好ましくは10〜20重量％である。これよりタル
ク微粉体含量が小さいと表面のマット形成効果が小さ
く、一方、タルク微粉体含量が大きい場合には樹脂との
混合不良がおこり、均質な表面層を形成することができ
ない。タルク微粉体を含有するアクリル樹脂はメチルメ
タクリレート単独重合体及びメチルメタクリレートとＣ
1〜Ｃ4のアルキル基からなるアルキルアクリレート、フ
ェニル、シクロヘキシル、ｔ−ブチルシクロヘキシル等
のメタアクリレートとの共重合体、アクリル系ゴム及び
ブタジエン系ゴムを含有した耐衝撃性アクリル樹脂、ス
チレン、α−メチルスチレン、アクリル酸とメチルメタ
クリレートの共重合体及び該共重合体の脱水による六員
環構造体をポリマー中に含有する耐熱性アクリル樹脂及
びイミド系耐熱アクリル樹脂などをいい、基材部のアク
リル樹脂も同様である。ここで表層部と基材部のアクリ
ル樹脂は必ずしも同一である必要はなく、いずれの組合
わせでも界面の密着性は十分なものである。本発明で表
層部の厚みは10〜200μmであり、好ましくは20〜100μm
である。表層部の厚みがこれより薄いと熱成形すると良
好なマット形状が得られず、一方、この範囲より大きい
場合には全光線透過率が低下し問題となる。表層部は片
面、両面いずれの積層シートであってもよい。本発明の
特徴の一つは、熱成形しても艶もどりがしない点にあ
り、むしろ熱成形した成形品の光沢度は低下する。該積
層シートの熱成形前後の表面粗さを粗さ計を用いて及び
表面状態を微分干渉顕微鏡により評価し、その結果を図
１〜４に示す。これからもわかるように熱成形により表
面の凹凸が増加しており、このためにむしろ艶消し性が
向上していることがわかる。この図１〜４に示すサンプ
ルは実施例１の方法により作成した。本発明の積層シー
トの厚みは、用途が照明カバーが主であることを考えれ
ば全体の厚みは0.8〜3mmであるが、特にこの範囲に限る
ものではない。本発明の積層シートを得る方法は、２
台以上の押出機を用いて表層部の樹脂と基材部の樹脂を
同時に押出して（共押出し）多層ダイを用いて積層シー
トを得る方法、予め表層部の樹脂で所望の薄いフィル
ムを作成し、これを基材部に押出機の出口でラミネート
させる方法、表層部の樹脂を溶剤に溶解分散させたも
のをコーティングする方法などがあるが、本発明の方法
は連続一貫生産性及び品質の点から共押出しによる積層
化が好ましい。共押出しによる方法では表層部の樹脂は
予め所望の粒径、量のタルクとアクリル樹脂とを均一混
合させた後、ペレタイズしておき、これを共押出しの原
料として用いる。又、表層部の厚み、及び積層シート全
体の厚みは２台以上の押出機の押出量、ダイのリップ開
度、シート幅、ロールクリアランスを調整することで任
意に得ることができる。本発明の表層部、基材部にはシ
ートの全光線透過率や、ヘーズ、透けを調整する為に無
機、有機の拡散剤を加えたり、染顔料の着色剤や、帯電
防止性能を付与するためにアニオン系、カチオン系、ノ
ニオン系の界面活性剤、その他各種の可塑剤、安定剤を
添加してもよい。Means for Solving the Problems In order to solve the above problems, the present inventors have conducted intensive studies and achieved the object by providing a certain amount of talc fine powder in the surface layer of an acrylic resin to provide an acrylic resin layer. And completed the present invention. That is, the present invention has a thickness on the surface of the acrylic resin layer.
The present invention relates to an acrylic resin laminated sheet which has an acrylic resin layer of 10 to 200 μm and a talc fine powder content of 7 to 30% by weight. The feature of the present invention is to form a fine uneven surface on the sheet surface by laminating an acrylic resin layer containing a high concentration of talc fine powder on an acrylic resin sheet as a very thin layer, and furthermore, this uneven surface is It did not disappear even by thermoforming, but rather increased and surface glossiness was reduced. The talc fine powder used in the present invention is a flat fine powder obtained by mechanically pulverizing plate-like raw talc (talc) mainly composed of naturally occurring magnesium silicate, and has a particle size of 1%. ~ 20
μ, but in the present invention, preferably 10-20
μ. If the particle size is smaller than this, the matte forming effect on the surface is small, while if the particle size is larger than this, the matte surface of the surface becomes rough and grainy. The content of the fine talc powder in the resin forming the surface layer must be 5 to 30% by weight, and preferably 10 to 20% by weight. If the talc fine powder content is smaller than this, the effect of forming a mat on the surface is small, while if the talc fine powder content is large, poor mixing with the resin occurs, and a uniform surface layer cannot be formed. Acrylic resin containing talc fine powder is methyl methacrylate homopolymer and methyl methacrylate and C
Alkyl acrylates consisting of an alkyl group having 1 -C 4, phenyl, cyclohexyl, copolymers of methacrylate such as t- butylcyclohexyl, impact-resistant acrylic resin containing an acrylic rubber and butadiene rubber, styrene, alpha- Methyl styrene, a heat-resistant acrylic resin containing a copolymer of acrylic acid and methyl methacrylate and a six-membered ring structure obtained by dehydration of the copolymer in the polymer, and an imide-based heat-resistant acrylic resin. The same applies to resin. Here, the acrylic resin of the surface layer portion and the acrylic resin of the base portion are not necessarily the same, and any combination provides sufficient adhesion at the interface. In the present invention, the thickness of the surface layer portion is 10 to 200 μm, preferably 20 to 100 μm
It is. If the thickness of the surface layer portion is smaller than this, a good mat shape cannot be obtained by thermoforming. On the other hand, if the thickness is larger than this range, the total light transmittance is reduced, which is problematic. The surface layer may be a single-sided or double-sided laminated sheet. One of the features of the present invention is that gloss is not lost even when thermoformed, and the gloss of the thermoformed product is rather reduced. The surface roughness of the laminated sheet before and after thermoforming was evaluated using a roughness meter and the surface state was evaluated using a differential interference microscope, and the results are shown in FIGS. As can be seen, the surface irregularities are increased by the thermoforming, and the matting property is rather improved due to this. The samples shown in FIGS. 1 to 4 were prepared by the method of Example 1. The total thickness of the laminated sheet of the present invention is 0.8 to 3 mm, considering that the application is mainly for a lighting cover, but is not particularly limited to this range. The method for obtaining the laminated sheet of the present invention is as follows.
A method of simultaneously extruding the resin of the surface layer portion and the resin of the substrate portion using more than one extruder (co-extrusion) to obtain a laminated sheet using a multilayer die. There is a method of laminating the resin at the outlet of the extruder on the base material part, a method of coating a resin obtained by dissolving and dispersing the surface layer resin in a solvent, and the like. And lamination by co-extrusion is preferred. In the co-extrusion method, the resin of the surface layer is prepared by uniformly mixing talc and an acrylic resin having a desired particle size and amount in advance, and then pelletizing, and using the resultant as a raw material for co-extrusion. Further, the thickness of the surface layer portion and the thickness of the entire laminated sheet can be arbitrarily obtained by adjusting the extrusion amount of two or more extruders, the lip opening degree of the die, the sheet width, and the roll clearance. The surface layer portion of the present invention, the substrate portion, the total light transmittance of the sheet, haze, inorganic or organic in order to adjust the sheer, or adding an organic diffusing agent, or a coloring agent of dyes and pigments, impart antistatic performance. For this purpose, an anionic, cationic or nonionic surfactant, other various plasticizers and stabilizers may be added.
【０００５】[0005]
【実施例】以下、実施例、比較例で本発明を具体的に説
明する。なお、各実施例、比較例で用いた評価及び試験
方法は次の通りである。 1)艶消し剤の粒径は重力沈降法で測定された平均粒径を
示す。 2)表層部の厚みは積層シート断面を光学顕微鏡で観察し
た。 3)全光線透過率及び光沢度（60°鏡面光沢度）はＪＩＳ
Ｋ−７１０５に準拠した。 4)熱成形は100mmφ、高さ50mmの帽子形真空成形用金型
を用い、シートの表面温度 160℃で真空成形を行った。
成形後の光沢度は、成形品の平面部を測定した。The present invention will be described below in detail with reference to examples and comparative examples. The evaluation and test methods used in each of the examples and comparative examples are as follows. 1) The particle size of the matting agent indicates an average particle size measured by a gravity sedimentation method. 2) For the thickness of the surface layer, the cross section of the laminated sheet was observed with an optical microscope. 3) Total light transmittance and gloss (60 ° specular gloss) are JIS
K-7105. 4) The thermoforming was performed by using a hat-shaped vacuum forming mold having a diameter of 100 mm and a height of 50 mm at a sheet surface temperature of 160 ° C.
The glossiness after molding was measured on the flat part of the molded article.
【０００６】実施例１ （表層部樹脂の作成）アクリル樹脂に旭化成工業（株）
製のデルペットＲＬＰ−１を用い、タルクは日本タルク
（株）製のタルクＮＴ（平均粒径10μｍ）を13重量％に
なる様に配合し、これをタンブラーで混合させた後、30
φのペレタイザーを使ってペレット状にした。 （共押出し積層シートの作成）表層部用樹脂には前記で
ペレット化したサンプルを使って20φ押出機から、又、
基材部用樹脂には旭化成工業（株）デルペットＬＰ−１
を使って40φ押出機から、それぞれ同時押出しを行い、
２種２層用ダイを用いて積層化し、その後３本ロールを
通してシート化した。積層シートの表層部の厚みは20φ
押出機と40φ押出機の吐出量を調整し、積層シートの全
体厚み 3mm、表層部の厚み30μｍの艶消し状シートを得
た。 （評価）上記積層シートについて全光線透過率、光沢度
を測定し、それぞれ82％及び 7％を得た。更に該シート
について真空成形を行い、熱成形後の光沢度は 5％であ
り、良好な艶消し性を有する成形品を得ることができ
た。Example 1 (Preparation of surface resin) Asahi Kasei Kogyo Co., Ltd.
Talc NT (manufactured by Nippon Talc Co., Ltd.) (average particle size: 10 μm) was blended so as to have a concentration of 13% by weight, and the mixture was mixed with a tumbler.
The pellet was formed using a φ pelletizer. (Creation of a co-extruded laminated sheet) For the resin for the surface layer portion, using the sample pelletized above, from a 20φ extruder,
Asahi Kasei Kogyo Co., Ltd. Delpet LP-1
Using a 40φ extruder, simultaneously extrude each,
The sheets were laminated using a two-layer, two-layer die, and then sheeted through three rolls. The thickness of the surface layer of the laminated sheet is 20φ
The discharge rate of the extruder and the 40φ extruder was adjusted to obtain a mat-like sheet having a total thickness of the laminated sheet of 3 mm and a thickness of the surface layer of 30 μm. (Evaluation) The total light transmittance and the glossiness of the laminated sheet were measured to obtain 82% and 7%, respectively. Further, the sheet was subjected to vacuum forming, and the gloss after thermoforming was 5%, so that a molded article having good matte properties could be obtained.
【０００７】実施例２−６、比較例１−４ 表層部のタルク配合量を各種変えたもの及び表層部の厚
みを変えたもの、又、タルクの粒径を変えたものについ
て実施例１と同様にして積層シートをつくり評価した。
結果を表１に示す。Examples 2-6, Comparative Examples 1-4 Examples in which the amount of talc in the surface layer was varied, the thickness of the surface layer was varied, and the particle size of talc was varied in Examples 1-6. Similarly, a laminated sheet was prepared and evaluated.
Table 1 shows the results.
【０００８】比較例５−６ 表層部の添加剤をタルク以外に炭酸カルシウム、シリカ
を用いて表１に記載の組成で実施例１と同様にして積層
シートを作成し評価した。結果を表１に示す。Comparative Examples 5-6 Laminate sheets were prepared and evaluated in the same manner as in Example 1 with the compositions shown in Table 1 using calcium carbonate and silica in addition to talc as the additives for the surface layer. Table 1 shows the results.
【０００９】[0009]
【表１】 [Table 1]
【００１０】[0010]
【図１】本発明の艶消し性アクリル樹脂積層シート（実
施例１）の熱成形前の表面粗さを示す図。FIG. 1 is a view showing the surface roughness of a matte acrylic resin laminated sheet (Example 1) of the present invention before thermoforming.
【図２】同シートの熱成形後の表面粗さを示す図。FIG. 2 is a view showing the surface roughness of the sheet after thermoforming.
【図３】同シートの熱成形前の微分干渉顕微鏡写真。FIG. 3 is a differential interference micrograph of the sheet before thermoforming.
【図４】同シートの熱成形後の微分干渉顕微鏡写真。FIG. 4 is a differential interference micrograph of the sheet after thermoforming.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 細谷 和弘 神奈川県川崎市川崎区夜光１丁目３番１ 号 旭化成工業株式会社内 (56)参考文献 特開 平２−208036（ＪＰ，Ａ) 特開 平２−208035（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) B32B 1/00 - 35/00 B29C 51/00 - 51/46 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiro Hosoya 1-3-1 Yoko, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Asahi Kasei Kogyo Co., Ltd. (56) References JP-A-2-208036 (JP, A) Hei 2-208035 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) B32B 1/00-35/00 B29C 51/00-51/46
Claims (1)
でタルク微粉体含量7〜30重量％のアクリル樹脂層を有
する熱成形で艶戻りしない艶消し性に優れたアクリル樹
脂積層シート。1. A thickness of 10 to 200 μm on the surface of an acrylic resin layer.
An acrylic resin laminated sheet with excellent matting properties that does not gloss by thermoforming and has an acrylic resin layer with a talc fine powder content of 7 to 30% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3126523A JP2934339B2 (en) | 1991-05-01 | 1991-05-01 | Matte acrylic resin laminated sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3126523A JP2934339B2 (en) | 1991-05-01 | 1991-05-01 | Matte acrylic resin laminated sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0592529A JPH0592529A (en) | 1993-04-16 |
| JP2934339B2 true JP2934339B2 (en) | 1999-08-16 |
Family
ID=14937317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3126523A Expired - Lifetime JP2934339B2 (en) | 1991-05-01 | 1991-05-01 | Matte acrylic resin laminated sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2934339B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6504928B1 (en) | 1996-09-27 | 2003-01-07 | Nissha Printing Co., Ltd. | Upper closure of a portable telephone and method of producing the upper closure of the portable telephone |
| US6752946B2 (en) | 1996-09-27 | 2004-06-22 | Nissha Printing Co., Ltd. | Cellular phone top cover and method of manufacturing the cellular phone top cover |
| JP4669142B2 (en) * | 2001-03-15 | 2011-04-13 | 三菱レイヨン株式会社 | Acrylic resin laminated film, method for producing the same, and laminate using the same |
-
1991
- 1991-05-01 JP JP3126523A patent/JP2934339B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0592529A (en) | 1993-04-16 |
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