JP2008500918A - 減少したカールをもつ平坦な薄い芯の積層板製造用の積層板組成物 - Google Patents
減少したカールをもつ平坦な薄い芯の積層板製造用の積層板組成物 Download PDFInfo
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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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
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- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
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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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/12—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/02—Layered products essentially comprising sheet glass, or glass, slag, or like fibres in the form of fibres or filaments
- B32B17/04—Layered products essentially comprising sheet glass, or glass, slag, or like fibres in the form of fibres or filaments bonded with or embedded in a plastic substance
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/0007—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality
- B32B37/0015—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality to avoid warp or curl
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B32B5/02—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 structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
- C09J163/04—Epoxynovolacs
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
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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
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/101—Glass fibres
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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
- B32B2305/00—Condition, form or state of the layers or laminate
- B32B2305/07—Parts immersed or impregnated in a matrix
- B32B2305/076—Prepregs
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/54—Yield strength; Tensile strength
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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
- B32B2311/00—Metals, their alloys or their compounds
- B32B2311/12—Copper
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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
- B32B2398/00—Unspecified macromolecular compounds
- B32B2398/10—Thermosetting resins
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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
- B32B2457/00—Electrical equipment
- B32B2457/08—PCBs, i.e. printed circuit boards
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0313—Organic insulating material
- H05K1/0353—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement
- H05K1/0366—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement reinforced, e.g. by fibres, fabrics
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/03—Conductive materials
- H05K2201/0332—Structure of the conductor
- H05K2201/0335—Layered conductors or foils
- H05K2201/0355—Metal foils
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31511—Of epoxy ether
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
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- Y10T428/31511—Of epoxy ether
- Y10T428/31515—As intermediate layer
- Y10T428/31522—Next to metal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
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- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31511—Of epoxy ether
- Y10T428/31529—Next to metal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- Y10T442/2475—Coating or impregnation is electrical insulation-providing, -improving, or -increasing, or conductivity-reducing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- Y10T442/2926—Coated or impregnated inorganic fiber fabric
- Y10T442/2992—Coated or impregnated glass fiber fabric
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
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- Y10T442/30—Woven fabric [i.e., woven strand or strip material]
- Y10T442/3382—Including a free metal or alloy constituent
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/30—Woven fabric [i.e., woven strand or strip material]
- Y10T442/3382—Including a free metal or alloy constituent
- Y10T442/3415—Preformed metallic film or foil or sheet [film or foil or sheet had structural integrity prior to association with the woven fabric]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/30—Woven fabric [i.e., woven strand or strip material]
- Y10T442/3382—Including a free metal or alloy constituent
- Y10T442/3415—Preformed metallic film or foil or sheet [film or foil or sheet had structural integrity prior to association with the woven fabric]
- Y10T442/3423—Plural metallic films or foils or sheets
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
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- Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
- Y10T442/654—Including a free metal or alloy constituent
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
Description
New Yorkから市販のUVITEX(R)OB(2,5−チオフェンジイルビス(5−tert−ブチル−1,3−ベンゾオキサゾール)である。
積層板のカールに対する種々の材料及び工程因子の影響を定量的に決定するために一連の実験を実施した。従って、単層の薄い芯の積層板を調製し、カールの量を測定した。カール現象には多数の寄与因子が存在するが、銅箔の引っ張り強さが最大の影響を有することが発見された。より低い引っ張り強さをもつ銅箔は4mil(0.1mm)以下の薄い芯構造において約50%だけカールを有意に減少することが発見された。この変化は他のあまり有意ではない工程因子を調和して、最新の製造システムに平易に導入することができる。
因子 レベル
・プレス(熱上昇) 1(熱上昇4.42F°/分)、2(3.5F°/分)
・紙の枚数 6、12
・B−段階構造の布 FR406樹脂を含む106布を使用して
1×70%、2×66%、1×63%及び70%
・Cu引っ張り強さ、Ksi, 44(21.4%)、47(20.4%)、
1.0oz@20℃ 52(17.2%)*
*20℃における対応する伸長値は( )内
測定反応
・測定された各4隅の平均カール
・4種のカール測定値の範囲
・すべての試料が硬化されたことを確認するためにTgを測定した
・フィラメント間の糸のボイド(IYV)
・パネルの厚さ
芯構造。すべてHexcel 106 CS4552布及びFR406樹脂を使用して3種の異なる芯構造を研究した。
1×樹脂含量70%(.002”芯)、[布及び硬化樹脂の厚さ]
2×樹脂含量66%(.0035”芯)及び
1各樹脂含量63%及び70%(.0035”)。
試料 プレス
A 1
B 2
プレスは入れ子因子(nesting factor)であるので、2種のプレス間に直接実施することができる唯一の分析は工程の結果としての相対的なカールの寄与を示す分散分析(ANOVA)であった。この場合は、熱上昇がパラメーターである。
すべての測定はインチ P11(熱上昇4.42F°/分)P22(3.5F°/分)
平均 標準偏差 n 平均 標準偏差 n
カールの平均 0.262 0.109 288 0.197 0.079 216
カールの範囲 0.298 0.152 288 0.242 0.178 216
P1はプレス1であり、P2はプレス2である。
双方のプレス中で製造された積層板に対し、積層板及び個々のパネルに対するカールの変動性により示される時の全体的工程の変動はカールに対する有意な寄与を示す。これは主要因子のプロットに対するカールの大きな変動により示される。モデルはプレス1に対して総変動の67パーセント(より早い熱上昇)そしてプレス2の総変動の69パーセント(より遅い熱上昇)の原因であった。
双方のプレスで製造された積層板につき、積層板及び個々のパネルに対するカールの変動性により示される時の全体的工程の変動は有意な寄与物であった。これは主要因子のプロット上のカールの大きい変動により示される(図1〜4)。モデルはプレス1に対し総変動の81パーセント(より早い熱上昇)、そしてプレス2の総変動の77パーセント(より遅い熱上昇)の原因であった。
Claims (11)
- プリプレグ及び、プリプレグの少なくとも片面に結合された銅箔(ここで該銅箔は47ksi(約3304.1kg/cm2)未満の引っ張り強さをもつ)を含んでなる銅張り積層板。
- 銅箔が45ksi(約3163.5kg/cm2)未満の引っ張り強さを有する請求項1の銅張り積層板。
- 銅箔が42ksi(約2952.6kg/cm2)以上の引っ張り強さを有する請求項2の銅張り積層板。
- 銅箔が0.5oz(約14.2g)又は1oz(約28.4g)の銅箔である請求項1の銅張り積層板。
- プリプレグが熱硬化性樹脂及び芯材料を含んでなる請求項1の積層板。
- 熱硬化性樹脂がハイモジュラス樹脂である請求項5の積層板。
- 熱硬化性樹脂がFR4樹脂である請求項5の積層板。
- 芯材料がガラス繊維、不織ガラス布及び紙からなる群から選択される請求項5の銅張り積層板。
- 積層板が1層の積層板である請求項1の銅張り積層板。
- 積層板が薄い芯の積層板である請求項9の銅張り積層板。
- FR106樹脂及び芯材料を含んでなるプリプレグ並びに
銅箔が45ksi(約3163.5kg/cm2)未満の引っ張り強さを有し、そして積層板が4mil(約0.10mm)以下の全厚さを有する、プリプレグの少なくと片面に結合された銅箔、
を含んでなる薄い芯の積層板。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/858,344 US8263225B2 (en) | 2004-06-01 | 2004-06-01 | Laminate composition for producing reduced curl flat thin core laminate |
PCT/US2005/018328 WO2005118279A2 (en) | 2004-06-01 | 2005-05-24 | Laminate composition for producing reduced curl flat thin core laminate |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2013079673A Division JP2013136253A (ja) | 2004-06-01 | 2013-04-05 | 減少したカールを示す積層板 |
Publications (1)
Publication Number | Publication Date |
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JP2008500918A true JP2008500918A (ja) | 2008-01-17 |
Family
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Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
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JP2007515289A Pending JP2008500918A (ja) | 2004-06-01 | 2005-05-24 | 減少したカールをもつ平坦な薄い芯の積層板製造用の積層板組成物 |
JP2013079673A Pending JP2013136253A (ja) | 2004-06-01 | 2013-04-05 | 減少したカールを示す積層板 |
JP2015028361A Expired - Fee Related JP6282239B2 (ja) | 2004-06-01 | 2015-02-17 | 減少したカールを示す積層板 |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
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JP2013079673A Pending JP2013136253A (ja) | 2004-06-01 | 2013-04-05 | 減少したカールを示す積層板 |
JP2015028361A Expired - Fee Related JP6282239B2 (ja) | 2004-06-01 | 2015-02-17 | 減少したカールを示す積層板 |
Country Status (8)
Country | Link |
---|---|
US (1) | US8263225B2 (ja) |
EP (1) | EP1758735B1 (ja) |
JP (3) | JP2008500918A (ja) |
KR (1) | KR100867906B1 (ja) |
CN (1) | CN101031413A (ja) |
CA (1) | CA2578584C (ja) |
SG (1) | SG154436A1 (ja) |
WO (1) | WO2005118279A2 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7255927B2 (en) * | 2001-12-05 | 2007-08-14 | Isola Usa Corp. | Laminate composition |
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- 2005-05-24 EP EP20050753799 patent/EP1758735B1/en not_active Not-in-force
- 2005-05-24 CN CNA2005800178291A patent/CN101031413A/zh active Pending
- 2005-05-24 WO PCT/US2005/018328 patent/WO2005118279A2/en active Application Filing
- 2005-05-24 SG SG200904459-5A patent/SG154436A1/en unknown
- 2005-05-24 KR KR1020067025329A patent/KR100867906B1/ko not_active IP Right Cessation
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2013
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Also Published As
Publication number | Publication date |
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EP1758735B1 (en) | 2012-06-27 |
EP1758735A4 (en) | 2010-06-16 |
US20050266756A1 (en) | 2005-12-01 |
WO2005118279A3 (en) | 2006-07-27 |
KR100867906B1 (ko) | 2008-11-10 |
JP6282239B2 (ja) | 2018-02-21 |
EP1758735A2 (en) | 2007-03-07 |
US8263225B2 (en) | 2012-09-11 |
JP2015131489A (ja) | 2015-07-23 |
WO2005118279A2 (en) | 2005-12-15 |
CN101031413A (zh) | 2007-09-05 |
KR20070085107A (ko) | 2007-08-27 |
CA2578584C (en) | 2011-12-20 |
CA2578584A1 (en) | 2005-12-15 |
SG154436A1 (en) | 2009-08-28 |
JP2013136253A (ja) | 2013-07-11 |
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