JPH0493206A - Molding processing apparatus - Google Patents
Molding processing apparatusInfo
- Publication number
- JPH0493206A JPH0493206A JP20923190A JP20923190A JPH0493206A JP H0493206 A JPH0493206 A JP H0493206A JP 20923190 A JP20923190 A JP 20923190A JP 20923190 A JP20923190 A JP 20923190A JP H0493206 A JPH0493206 A JP H0493206A
- Authority
- JP
- Japan
- Prior art keywords
- iron
- resin
- cobalt
- chromium
- nickel
- 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.)
- Pending
Links
- 238000000465 moulding Methods 0.000 title claims abstract description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 59
- 229910052742 iron Inorganic materials 0.000 claims abstract description 29
- 229920006259 thermoplastic polyimide Polymers 0.000 claims abstract description 28
- 239000009719 polyimide resin Substances 0.000 claims abstract description 27
- 239000011347 resin Substances 0.000 claims abstract description 23
- 229920005989 resin Polymers 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000007769 metal material Substances 0.000 claims description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 25
- 229910052751 metal Inorganic materials 0.000 abstract description 23
- 239000002184 metal Substances 0.000 abstract description 21
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 12
- 239000011651 chromium Substances 0.000 abstract description 12
- 229910052759 nickel Inorganic materials 0.000 abstract description 12
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 abstract description 11
- 229910052804 chromium Inorganic materials 0.000 abstract description 10
- 239000010941 cobalt Substances 0.000 abstract description 10
- 229910017052 cobalt Inorganic materials 0.000 abstract description 9
- 238000002845 discoloration Methods 0.000 abstract description 8
- 229910045601 alloy Inorganic materials 0.000 abstract description 7
- 239000000956 alloy Substances 0.000 abstract description 7
- 238000007254 oxidation reaction Methods 0.000 abstract description 7
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 4
- 239000011733 molybdenum Substances 0.000 abstract description 4
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 4
- 229910000599 Cr alloy Inorganic materials 0.000 abstract description 3
- 239000010935 stainless steel Substances 0.000 abstract description 3
- 229920005992 thermoplastic resin Polymers 0.000 abstract description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 2
- 230000000704 physical effect Effects 0.000 abstract description 2
- 239000010936 titanium Substances 0.000 abstract description 2
- 229910052719 titanium Inorganic materials 0.000 abstract description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052721 tungsten Inorganic materials 0.000 abstract description 2
- 239000010937 tungsten Substances 0.000 abstract description 2
- 229910000531 Co alloy Inorganic materials 0.000 abstract 1
- 239000000788 chromium alloy Substances 0.000 abstract 1
- 229910000601 superalloy Inorganic materials 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 3
- 238000000921 elemental analysis Methods 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000012299 nitrogen atmosphere Substances 0.000 description 3
- 229910001080 W alloy Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000001879 gelation Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000669 Chrome steel Inorganic materials 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 101150000971 SUS3 gene Proteins 0.000 description 1
- 229910001347 Stellite Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 ferrous metals Chemical class 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野］
本発明は熱可塑性ポリイミド樹脂の成形加工機器に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a molding equipment for thermoplastic polyimide resin.
〔従来の技術］
近年、熱可塑性ポリイミド樹脂やその成型方法が報告さ
れている。しかし、熱可塑性ポリイミド樹脂の熔融成型
機器に関する報告は少なり、−船釣な成型加工機器が用
いられているのが現状である。熱可塑性ポリイミド樹脂
は従来の熱可塑性樹脂に比べ成型加工温度が高いために
、これまでの成型加工では稀にしか起こらなかった加工
機器の熱変形や高温下での金属と樹脂との反応等が発生
する。[Prior Art] In recent years, thermoplastic polyimide resins and methods for molding the same have been reported. However, there are few reports regarding melt molding equipment for thermoplastic polyimide resins, and at present, molding equipment that is carried out by boat is being used. Because thermoplastic polyimide resin has a higher molding temperature than conventional thermoplastic resins, it is prone to thermal deformation of processing equipment and reactions between metal and resin at high temperatures, which rarely occur in conventional molding processes. Occur.
［発明が解決しようとする課題］
本発明の目的は高温下で熱可塑性ポリイミド樹脂が成形
加工機器金属部との接触による酸化反応を防止できる成
形加工機器を提供することにある。[Problems to be Solved by the Invention] An object of the present invention is to provide a molding device that can prevent an oxidation reaction of a thermoplastic polyimide resin due to contact with a metal part of the molding device at high temperatures.
〔課題を解決するための手段］
本発明者らは、上記目的を達成するため鋭會検討し、つ
いに本発明に到った。[Means for Solving the Problems] In order to achieve the above object, the present inventors made intensive studies and finally arrived at the present invention.
即ち、本発明は熱可塑性ポリイミド樹脂を成形加工する
成形加工機器において、該樹脂が高温で接触する部分の
材質を鉄分の含有率が０〜８０重量％であり、且つブリ
ネル硬度（Ｈｌ）が１１５以上である金属材料からなる
ことを特徴とする成形加工機器である。That is, the present invention provides a molding equipment for molding thermoplastic polyimide resin, in which the material of the part that comes into contact with the resin at high temperature has an iron content of 0 to 80% by weight and a Brinell hardness (Hl) of 115. This is a forming processing device characterized by being made of the above metal material.
熱可塑性ポリイミド樹脂は周知の押出成型法により繊維
、フィルム、シート、電線被覆、棒、板及び管材等を製
造することができる。しかしながら、熱可塑性ポリイミ
ド樹脂は従来の熱可塑性樹脂よりも押出温度が高温であ
るために、押出機と熱可塑性ポリイミド樹脂の接触部に
おいて酸化反応が起こる。Thermoplastic polyimide resins can be used to produce fibers, films, sheets, wire coatings, rods, plates, pipe materials, etc. by the well-known extrusion molding method. However, since the extrusion temperature of thermoplastic polyimide resin is higher than that of conventional thermoplastic resins, an oxidation reaction occurs at the contact portion between the extruder and the thermoplastic polyimide resin.
この金属と熱可塑性ポリイミド樹脂との酸化反応は、金
属による熱可塑性ポリイミド樹脂の酸化なのか、熱可塑
性ポリイミド樹脂による金属の酸化なのかは分かってい
ない。しかし、高温下で金属と熱可塑性ポリイミド樹脂
との接触によって熱可塑性ポリイミド樹脂のゲル化によ
る増粘及び熱可塑性ポリイミド樹脂中への金属の浸入が
発生していることは分かっている。この反応は金属との
接触部分の樹脂の変色、フローテスターによる粘度測定
、蛍光Ｘ綿による樹脂中の金属元素分析によって確認で
きる。It is not known whether this oxidation reaction between the metal and the thermoplastic polyimide resin is an oxidation of the thermoplastic polyimide resin by the metal or an oxidation of the metal by the thermoplastic polyimide resin. However, it is known that contact between metal and thermoplastic polyimide resin at high temperatures causes thickening of the thermoplastic polyimide resin due to gelation and penetration of metal into the thermoplastic polyimide resin. This reaction can be confirmed by discoloration of the resin at the part in contact with the metal, viscosity measurement using a flow tester, and metal elemental analysis in the resin using fluorescent X cotton.
樹脂の変色は鉄を多く含む金属素材との接触時に発生す
る。また、樹脂への金属の浸入は構造金属材料全体で多
少の差は有るが確認できる。Discoloration of resin occurs when it comes into contact with metal materials containing a large amount of iron. In addition, the infiltration of metal into the resin can be confirmed although there are some differences among the structural metal materials as a whole.
樹脂中の金属元素分析の結果から、樹脂変色部分からは
押出機材質に起因する金属元素が検出され、特に鉄が最
も多く検出されることから、加工機器の金属材と熱可塑
性ポリイミド樹脂の高温下での接触による酸化反応は鉄
が関係していることが分かった。According to the results of metal element analysis in the resin, metal elements caused by the extruder material were detected in the discolored parts of the resin, and iron was detected the most, indicating that the high temperature of the metal materials of processing equipment and thermoplastic polyimide resin. It was found that iron is involved in the oxidation reaction due to contact below.
熱可塑性ポリイミド樹脂が高温下で溶融状態で鉄含有率
が８０重量％を越える材質と接触した場合には、熱可塑
性ポリイミド樹脂の接触面は黒色に変色し樹脂への鉄元
素の浸入が金属元素分析によって確認され、粘度も増加
する。また、鉄含有率が５０〜８０重量％の材質との接
触では変色はｉ認できないが、金属元素分析によって鉄
の浸入は僅かに確認でき、粘度の増加も僅かに見られる
。更に、鉄含有率が０〜５０重量％の材質との接触の場
合は、熱可塑性ポリイミド樹脂の変色も無く、樹脂への
鉄の浸入も蛍光Ｘ線による検出限界以下の検出値に収ま
り、粘度の増加は殆ど認められない。If thermoplastic polyimide resin comes into contact with a material with an iron content of more than 80% by weight in a molten state at high temperatures, the contact surface of the thermoplastic polyimide resin will turn black and iron elements will penetrate into the resin, resulting in metallic elements. Confirmed by analysis, the viscosity also increases. In addition, no discoloration can be observed upon contact with a material having an iron content of 50 to 80% by weight, but a slight intrusion of iron can be confirmed by metal elemental analysis, and a slight increase in viscosity can be observed. Furthermore, in the case of contact with a material with an iron content of 0 to 50% by weight, there is no discoloration of the thermoplastic polyimide resin, iron infiltration into the resin is within the detection limit of fluorescent X-rays, and the viscosity is Almost no increase was observed.
このことから、商品価値を下げる黒変色及び粘度が増加
するという樹脂物性の変化は鉄含有率が０〜８０重量％
の材質を用いることで解決でき、好ましくは鉄含有率０
〜５０重量％の材質が望ましく、更に好ましくは主成分
が鉄以外の合金が望まれる。From this, changes in resin physical properties such as black discoloration and increased viscosity that reduce commercial value occur when iron content is between 0 and 80% by weight.
This can be solved by using a material with iron content of 0.
A material with a content of ~50% by weight is desirable, and more preferably an alloy whose main component is other than iron.
また、成型加工機器の金属材質の硬度については、ブリ
ネル硬度（Ｈ，）が１１５より低い場合は高温下での長
期耐久性に欠け、連続使用時に変形および熱可塑性ポリ
イミド樹脂接触部の粗面化現象が起こり好ましくない。In addition, regarding the hardness of the metal material of the molding equipment, if the Brinell hardness (H,) is lower than 115, it will lack long-term durability under high temperatures, and will deform and roughen the surface of the contact area with thermoplastic polyimide resin during continuous use. An undesirable phenomenon occurs.
金属材質の硬度は鉄含有率を減らし、ニッケル、クロム
、コバルト、モリブデン、タングステン及びチタン等の
金属の含有率を増加させることで向上させることができ
る。また、これによって鉄含有率が低下し高温下での金
属材質との熱可塑性ポリイミド樹脂の接触による変色や
鉄元素の樹脂中への浸入を防ぐことができる。The hardness of the metal material can be improved by decreasing the iron content and increasing the content of metals such as nickel, chromium, cobalt, molybdenum, tungsten, and titanium. In addition, this reduces the iron content and prevents discoloration due to contact of the thermoplastic polyimide resin with metal materials at high temperatures and infiltration of iron elements into the resin.
機械用構造材料として用いられる金属材としては鉄を基
本とした物及び非鉄金属を基本とした物に大別できる。Metal materials used as structural materials for machinery can be broadly classified into those based on iron and those based on non-ferrous metals.
鉄を基本とした物としては、機械構造用炭素＠（Ｓ３５
Ｃ，３４５Ｃ等）、機械構造用マンガン鋼・マンガン／
クロム鋼及びクロムＥ（Ｓ門３、ＳＭｎＣ５，５Ｃｒ３
等）、機械構造用クロム／モリブデン鋼・ニッケル鋼・
ニッケル／クロム鋼及びニンケル／クロム／モリフ゛デ
ン鋼（ＳＣ）１３．５Ｎ６５．５ＮＣ３、ＳＮＣ門５等
）、窒化鋼（ＳＡＣＭＩ等）、ステンレス鋼（ＳＵＳ３
０４．５１１Ｓ３１６．５ＵＳ４４０．５ｌｌｌ（３３
０等）、鉄基超合金（Ｉｒｌｃｏ１ｏｙ９０１、Ｄ９７
９．５５９０等）及び鉄／ニッケル／コバルト／クロム
系超合金（Ｎ１５３、Ｎ１５６等）等が挙げられる。非
鉄金属を基本とする物はニッケル基赳合金（Ｈａｓｔｅ
ｌｌｏｙ 、 １ｎｃｏｎｅ１等）、コバルト基超合金
（Ｓ８１６、ＨＳ１５１ 、Ｎ１ｖｃ。Carbon for machine structures (S35) is a material based on iron.
C, 345C, etc.), manganese steel/manganese for machine structures/
Chrome steel and chromium E (S gate 3, SMnC5, 5Cr3
etc.), chromium/molybdenum steel, nickel steel,
Nickel/chromium steel and Nickel/chromium/molybdenum steel (SC) 13.5N65.5NC3, SNC gate 5, etc.), nitriding steel (SACMI, etc.), stainless steel (SUS3
04.511S316.5US440.5lll (33
0, etc.), iron-based superalloys (Irlco1oy901, D97
9.5590, etc.) and iron/nickel/cobalt/chromium-based superalloys (N153, N156, etc.). Items based on nonferrous metals include nickel-based alloys (Haste).
lloy, 1ncone1, etc.), cobalt-based superalloys (S816, HS151, N1vc.
等）及びコバルト／クロム／タングステン合金（Ｓｔｅ
ｌｌｉｔｅ）等が挙げられ、この他に表面被覆としてニ
ッケルやクロム等を用いたメツキも挙げられる。 これ
らの機械構造用鋼の中で熱可塑性ポリイミド樹脂の成型
加工機器用に好ましく用いられる物としては、鉄を基本
とする物の中ではステンレス鋼、鉄基超合金及び鉄／ニ
ッケル／コバルト／クロム系超合金が挙げられ、非鉄金
属を基本とする物の中ではニッケル基赳合金、コバルト
基超合金及びコバルト／クロム／タングステン合金が挙
げられる。また、ニッケル及びクロム等を用いたメツキ
による表面被覆も挙げられる。etc.) and cobalt/chromium/tungsten alloys (Ste
llite), and plating using nickel, chromium, etc. as a surface coating. Among these mechanical structural steels, stainless steel, iron-based superalloys, and iron/nickel/cobalt/chromium are preferred for use in thermoplastic polyimide resin molding equipment. Examples include nickel-based superalloys, cobalt-based superalloys, and cobalt/chromium/tungsten alloys among those based on nonferrous metals. Another example is surface coating by plating using nickel, chromium, or the like.
〔実施例］ 以下、実施例により本発明を更に詳しく説明する。〔Example] Hereinafter, the present invention will be explained in more detail with reference to Examples.
熱可塑性ポリイミド樹脂は、下記一般式ＣＩ）及び（Ｉ
Ｉ）で表される繰り返し構造を有する三井東圧化学■製
ＮＥＷ−ＴＰＩ４４５０パウダー及びＬＡＲＫ−ＴＰＩ
＃４５０パウダーを用いた。The thermoplastic polyimide resin has the following general formulas CI) and (I
NEW-TPI4450 powder and LARK-TPI manufactured by Mitsui Toatsu Chemical Co., Ltd. having the repeating structure represented by I)
#450 powder was used.
実施例１〜１０、比較例１〜４
一般式（１）及び（ＩＩ）で表される熱可塑性ポリイミ
ド樹脂のパウダーを第１表に示す金属素材よりなる板状
試料間に挟み込み、窒素雰囲気下で第１表に示す条件で
溶融・保持・冷却固化させ、樹脂の変色状態を目視観察
し、金属元素分析は島津製作所製ＥＰＭＡ−ＣＩを用い
て行った。更に、これらの樹脂を１−角に切り出し第１
表に示す温度条件下で、１津製作所製フローテスターＣ
ＦＴ５００Ａを用いて窒素雰囲気下で熔融粘度を測定し
た。結果を第１表に示す。Examples 1 to 10, Comparative Examples 1 to 4 Powders of thermoplastic polyimide resins represented by general formulas (1) and (II) were sandwiched between plate-shaped samples made of metal materials shown in Table 1, and heated under a nitrogen atmosphere. The resin was melted, held, and cooled to solidify under the conditions shown in Table 1, and the state of discoloration of the resin was visually observed, and metal elemental analysis was performed using EPMA-CI manufactured by Shimadzu Corporation. Furthermore, these resins were cut into 1-angle pieces.
Under the temperature conditions shown in the table, flow tester C manufactured by Ichitsu Seisakusho
Melt viscosity was measured in a nitrogen atmosphere using FT500A. The results are shown in Table 1.
参考例１．２
ＮＥＷ−ＴＰ Ｉ＃４５０及びＬＡＲＫ−ＴＰ １＃４
５０のパウダーを用い、第１表に示す温度条件下で、１
津製作所製フローテスターＣＦＴ−５０ＯＡを用いて窒
素雰囲気下で溶融粘度を測定した。Reference example 1.2 NEW-TP I#450 and LARK-TP 1#4
50 powder under the temperature conditions shown in Table 1.
Melt viscosity was measured in a nitrogen atmosphere using a flow tester CFT-50OA manufactured by Tsu Seisakusho.
結果を第１表に示す。The results are shown in Table 1.
本発明による成型加工機器を用いることによって、熱可
塑性ポリイミド樹脂を高温下で成形加工する際に、成型
加工機器の樹脂接触部分の金属と該樹脂が反応しあい、
該樹脂の金属接触部分の黒色変化及び該樹脂のゲル化に
よる粘度の増加を抑制できる。By using the molding equipment according to the present invention, when molding thermoplastic polyimide resin at high temperatures, the metal of the resin contacting part of the molding equipment reacts with the resin,
It is possible to suppress the blackening of the metal contact portion of the resin and the increase in viscosity due to gelation of the resin.
Claims (1)
器において、該樹脂が高温で接触する部分の材質を鉄分
の含有率が０〜８０重量％であり、且つブリネル硬度（
Ｈ＿Ｂ）が１１５以上である金属材料からなることを特
徴とする成形加工機器。 ２、該金属材料が成形機器要部全体を構成してなる請求
項１記載の成形加工機器。 ３、該金属材料が成形機器要部の該樹脂接触部に被膜を
形成されてなる請求項１記載の成形加工機器。[Claims] 1. In the molding equipment for molding thermoplastic polyimide resin, the material of the part that comes into contact with the resin at high temperature must have an iron content of 0 to 80% by weight, and a Brinell hardness (
A forming processing device characterized by being made of a metal material having H_B) of 115 or more. 2. The molding equipment according to claim 1, wherein the metal material constitutes the entire main part of the molding equipment. 3. The molding equipment according to claim 1, wherein the metal material is coated on the resin contacting part of the main part of the molding equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20923190A JPH0493206A (en) | 1990-08-09 | 1990-08-09 | Molding processing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20923190A JPH0493206A (en) | 1990-08-09 | 1990-08-09 | Molding processing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0493206A true JPH0493206A (en) | 1992-03-26 |
Family
ID=16569530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20923190A Pending JPH0493206A (en) | 1990-08-09 | 1990-08-09 | Molding processing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0493206A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0753545A2 (en) | 1995-07-13 | 1997-01-15 | Basf Aktiengesellschaft | Goniochromatic brilliant pigments based on transparent non-metallic platy substrates |
| WO2001030920A1 (en) | 1999-10-28 | 2001-05-03 | Merck Patent Gmbh | Intensely coloured interference pigments |
| WO2001030921A1 (en) | 1999-10-28 | 2001-05-03 | Merck Patent Gmbh | Interference pigments with great color strength |
-
1990
- 1990-08-09 JP JP20923190A patent/JPH0493206A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0753545A2 (en) | 1995-07-13 | 1997-01-15 | Basf Aktiengesellschaft | Goniochromatic brilliant pigments based on transparent non-metallic platy substrates |
| WO2001030920A1 (en) | 1999-10-28 | 2001-05-03 | Merck Patent Gmbh | Intensely coloured interference pigments |
| WO2001030921A1 (en) | 1999-10-28 | 2001-05-03 | Merck Patent Gmbh | Interference pigments with great color strength |
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