JP2011231171A - 樹脂発泡体及び発泡部材 - Google Patents
樹脂発泡体及び発泡部材 Download PDFInfo
- Publication number
- JP2011231171A JP2011231171A JP2010100819A JP2010100819A JP2011231171A JP 2011231171 A JP2011231171 A JP 2011231171A JP 2010100819 A JP2010100819 A JP 2010100819A JP 2010100819 A JP2010100819 A JP 2010100819A JP 2011231171 A JP2011231171 A JP 2011231171A
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- Prior art keywords
- resin
- resin foam
- foam
- carrier tape
- pressure
- 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.)
- Granted
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/36—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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Abstract
【解決手段】本発明の樹脂発泡体は、表面から内部に至る全体の樹脂組成が同一であり、60°光沢度(JIS Z 8741に基づく)が1.5以上である表面を有し、25%圧縮荷重(JIS K 6767に基づく)が2.00N/cm2以下であることを特徴とする。
【選択図】なし
Description
本発明の発泡部材は、前記樹脂発泡体を含む部材である。発泡部材の形状は、特に制限されないが、シート状(フィルム状を含む)が好ましい。また、発泡部材は、例えば、樹脂発泡体のみからなる構成であってもよいし、樹脂発泡体に他の層(特に粘着層(粘着剤層)、基材層など)が積層されている構成であってもよい。
本発明の発泡部材積層体は、前記の発泡部材、及び、基材の少なくとも片面に粘着剤層を有するキャリアテープにより構成され、なおかつ、前記の発泡部材が、キャリアテープにより、発泡部材の特定の表面とキャリアテープの粘着剤層とが接触する形態で、保持されている。
本発明の電気又は電子機器類は、前記の発泡部材が用いられた構成を有している。電気又は電子機器類において、前記の発泡部材は、例えば、防塵材、シール材、衝撃吸収材、防音材、緩衝材等として用いられている。このような電気又は電子機器類は、電気又は電子機器用の部材又は部品が、前記の発泡部材を介して所定の部位に取り付けられた(装着された)構成を有している。具体的には、電気又は電子機器類としては、光学部材又は部品としての液晶ディスプレイ、エレクトロルミネッセンスディスプレイ、プラズマディスプレイ等の画像表示装置(特に、小型の画像表示部材が光学部材として装着されている画像表示装置)や、カメラやレンズ(特に、小型のカメラ又はレンズ)が、前記の樹脂発泡体や発泡部材を介して装着された構成を有している電気又は電子機器類(例えば、いわゆる「携帯電話」や「携帯情報端末」等の移動体通信の装置など)が挙げられる。このような電気又は電子機器類は、従来より薄型化の製品であってもよく、その厚みや形状などは特に制限されない。
ポリプロピレン[メルトフローレート(MFR):0.35g/10min]:40重量部、ポリオレフィン系エラストマー[メルトフローレート(MFR):6g/10min、JIS A硬度:79°]:55重量部、カーボンブラック(商品名「旭♯35」旭カーボン株式会社製):6重量部、及び、パウダー状の難燃剤としての水酸化マグネシウム(平均粒子径:0.7μm):10重量部を、日本製鋼所(JSW)社製の二軸混練機にて、200℃の温度で混練した後、ストランド状に押出し、水冷後ペレット状に成形した。なお、ペレットの軟化点は155℃であった。また、その密度は、0.95g/cm3であった。
このペレットを、日本製鋼所社製の単軸押出機に投入し、220℃の雰囲気下、22(注入後19)MPaの圧力で、二酸化炭素ガスを注入した。二酸化炭素ガスを十分飽和させた後、発泡に適した温度まで冷却後、ダイから押出して、半連続半独立気泡構造を有するシート状樹脂発泡体を得た。
この樹脂発泡体において、見掛け密度は0.05g/cm3であり、厚みは2.0mmであり、発泡倍率は19倍であった。そして、この樹脂発泡体をスライスして、厚さが0.6mmの樹脂発泡体(樹脂発泡体(A)と称する場合がある)を得た。なお、樹脂発泡体(A)の25%圧縮荷重は、1.15N/cm2であった。
前記の樹脂発泡体(A)を、誘電発熱ロール(トクデン社製)を用いて、149℃の熱ロールに3.0秒間接触させることにより、前記の樹脂発泡体(A)の一方の表面について表面熱溶融処理を行った。そして、60°光沢度が2.3である表面を有する樹脂発泡体を得た。
前記の樹脂発泡体(A)を、熱ロールに7.0秒間接触させたこと以外は、実施例1と同様にして、前記の樹脂発泡体(A)の一方の表面について表面熱溶融処理を行った。そして、60°光沢度が2.6である表面を有する樹脂発泡体を得た。
前記の樹脂発泡体(A)を、熱ロールに4.2秒間接触させたこと以外は、実施例1と同様にして、前記の樹脂発泡体(A)の一方の表面について表面熱溶融処理を行った。そして、60°光沢度が2.4である表面を有する樹脂発泡体を得た。
前記の樹脂発泡体(A)を、熱ロールに2.3秒間接触させたこと以外は、実施例1と同様にして、前記の樹脂発泡体(A)の一方の表面について表面熱溶融処理を行った。そして、60°光沢度が2.1である表面を有する樹脂発泡体を得た。
前記の樹脂発泡体(A)を、147℃の熱ロールに4.2秒間接触させたこと以外は、実施例1と同様にして、前記の樹脂発泡体(A)の一方の表面について表面熱溶融処理を行った。そして、60°光沢度が1.8である表面を有する樹脂発泡体を得た。
前記の樹脂発泡体(A)を、151℃の熱ロールに接触させたこと以外は、実施例1と同様にして、前記の樹脂発泡体(A)の一方の表面について表面熱溶融処理を行った。そして、60°光沢度が2.2である表面を有する樹脂発泡体を得た。
前記の樹脂発泡体(A)をそのまま用いた。表面の60°光沢度は0.8であった。
前記の樹脂発泡体(A)を、147℃の熱ロールに3.0秒間接触させたこと以外は、実施例1と同様にして、前記の樹脂発泡体(A)の一方の表面について表面熱溶融処理を行った。そして、60°光沢度が1.2である表面を有する樹脂発泡体を得た。
前記の樹脂発泡体(A)を、熱ロールに1.4秒間接触させたこと以外は、実施例1と同様にして、前記の樹脂発泡体(A)の一方の表面について表面熱溶融処理を行った。そして、60°光沢度が1.3である表面を有する樹脂発泡体を得た。
実施例及び比較例について、下記の測定方法又は評価方法により、粘着力、フォーム破壊の有無、表面の60°光沢度、及び25%圧縮荷重を測定又は評価した。その結果を表1に示した。
樹脂発泡体(幅:20mm×長さ:120mm)を、温度:23±2℃、湿度:50±5%RHの雰囲気下にて24時間以上保管した後(前処理条件はJIS Z 0237に準じる)、幅:30mm×長さ:120mmのキャリアテープ(商品名「SPV−AM−500」日東電工社製、基材付き片面粘着テープ)の粘着剤層表面に、表面熱溶融処理が施されている面(比較例1は表面熱溶融処理が施されていないので、どちらの面でもよい)とキャリアテープの粘着剤表面とが接する形態で、2kgローラ、1往復の条件で圧着し、24時間放置して、測定用サンプルとした。
測定用サンプルのキャリアテープ基材側の面を、測定時に支持板(例えば厚さ2mmのベークライト板など)からの浮きや剥がれが生じないように、強粘着の両面粘着テープ(商品名「No.500」日東電工社製)を介して、支持板上に固定し、キャリアテープから樹脂発泡体を剥離する際に要する力を、温度:23±2℃、湿度:50±5%RHの雰囲気下、高速剥離条件(引張速度:10m/min、剥離角度:180°)、及び低速剥離条件(引張速度:0.3m/min、剥離角度:180°)の各条件で測定し、粘着力(N/20mm)を求めた。
なお、高速剥離条件での測定では高速剥離試験機(テスター産業社製)を使用し、低速剥離条件での測定では万能引張圧縮試験機(装置名「TCN−1kNB」ミネベア社製)を使用した。
上記測定において、高速剥離条件で測定する場合及び低速剥離条件で測定する場合の両方において、剥離の状態を目視で確認し、樹脂発泡体の表面破壊が生じているか否かにより判断した。
表1には、樹脂発泡体の表面破壊がない場合には「なし」と記載し、樹脂発泡体の表面破壊が生じる場合には「あり」と記載した。
樹脂発泡体の表面熱溶融処理が施された面(比較例1は表面熱溶融処理が施されていないので、どちらの面でもよい)の60°光沢度を、JIS Z 8741に基づき測定した。
測定の際には、光沢度計(装置名「高光沢グロスチェッカー IG−410」堀場製作所社製)を使用し、測定端子を流れ方向に垂直において測定した。
JIS K 6767に従い、測定した。
なお、25%圧縮荷重が2.00N/cm2を超えると、シール材としての使用中に筐体や部材の変形を生じさせるおそれがあり、結果としてシール材として必要な柔軟性を有しないと評価できる。
一方、比較例1では、表面熱溶融処理が施されておらず、粘着力が低い。発泡部材(比較例1の樹脂発泡体に粘着剤層を積層させることにより得られる発泡部材)を、発泡体表面が接する形態でキャリアテープに固定してから粘着剤層上に加工用の台紙を設けて、発泡部材の加工を行い、加工終了後の発泡部材を組み付ける際に、粘着剤層上に設けた加工用の台紙を剥がそうとすると、キャリアテープと発泡部材の発泡体表面との間でキャリアテープから発泡部材が剥がれてしまい、筐体に精密に転写すること(筐体に精密に組み付けること)が困難になると予想される。
実施例において、キャリアテープから発泡部材が剥がれて組み付けができないという問題を生じることがないのは、表面の表面粗さが小さくなることによって、キャリアテープとの密着面積が大きくなったためと考えられる。
Claims (14)
- 表面から内部に至る全体の樹脂組成が同一であり、60°光沢度(JIS Z 8741に基づく)が1.5以上である表面を有し、25%圧縮荷重(JIS K 6767に基づく)が2.00N/cm2以下であることを特徴とする樹脂発泡体。
- 表面に加熱溶融処理が施されている請求項1記載の樹脂発泡体。
- 連続気泡構造又は半連続半独立気泡構造を有している請求項1又は2記載の樹脂発泡体。
- 樹脂発泡体を構成する樹脂が熱可塑性樹脂を含む請求項1〜3の何れかの項に記載の樹脂発泡体。
- 前記熱可塑性樹脂がポリオレフィン系樹脂である請求項4記載の樹脂発泡体。
- 樹脂組成物に高圧のガスを含浸させた後、減圧する工程を経て形成されている請求項1〜5の何れかの項に記載の樹脂発泡体。
- 前記ガスが、不活性ガスである請求項6記載の樹脂発泡体
- 前記不活性ガスが、二酸化炭素である請求項7記載の樹脂発泡体。
- 前記高圧のガスが、超臨界状態のガスである請求項6〜8の何れかの項に記載の樹脂発泡体。
- 請求項1〜9の何れかの項の記載の樹脂発泡体を含む発泡部材。
- 60°光沢度(JIS Z 8741に基づく)が1.5以上である表面が露出し、なおかつ、粘着層を有する請求項10記載の発泡部材。
- 電気又は電子機器用として用いられている請求項10又は11に記載の発泡部材。
- 請求項10〜12の何れかの項に記載の発泡部材が、基材の少なくとも片面に粘着剤層を有するキャリアテープにより、発泡部材の60°光沢度(JIS Z 8741に基づく)が1.5以上である表面とキャリアテープの粘着剤層とが接触する形態で、保持されいることを特徴とする発泡部材積層体。
- 請求項12記載の発泡部材が用いられていることを特徴とする電気又は電子機器類。
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KR20110119556A (ko) | 2011-11-02 |
CN102234388B (zh) | 2014-08-27 |
CN104194112A (zh) | 2014-12-10 |
JP5508115B2 (ja) | 2014-05-28 |
CN102234388A (zh) | 2011-11-09 |
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US20110262744A1 (en) | 2011-10-27 |
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