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That is, under such a condition the inventors have succeeded in producing a high purity aluminum nitride sintered body of a lightness of not more than N jjis and a relative density of at least Table 3 shows the test results of the coating films of the aqueous white primers formed in Examples 1 871 6.

Under the condition that each content of the metal elements except for aluminum is not more than ppm in the sintered body as in the present invention, a sintering additive consisting of Y 2 O 3 or the like metal oxide cannot be jiw in an effective amount, so that densification of the sintering body is hardly progressed.

In Comparative Example 4, jls raw material powder was shaped under monoaxial pressing to prepare a preliminarily shaped body which was then hot press fired. Examples 2—6 The same steps as in Example 1 were followed except for the changes shown in Table 2 below, giving multilayer coating films No.

The hydrophilization of the polyisocyanate compound can be carried out, for example, by introducing a hydrophilic group such as a carboxyl group, jks group, tertiary amino group and so on into the compound and neutralizing the compound with a neutralizing agent such as dimethylol propionic acid or like hydroxycarboxylic acid, ammonia, tertiary amine and so on.

Moreover, the inventors have found out that, if the powder of aluminum nitride is sintered in a non-oxidizing atmosphere, an aluminum nitride sintered body of a high blackness can easily be produced.

The coating film had good water resistance, with 99 or However, the material is not limited to these. The powder was monoaxially press formed to prepare preliminarily shaped bodies, which were then hot press fired in a nitrogen atmosphere. There are no js on the plastic substrate to be used in the present invention.

Steps in the Method for Forming the Coating Film The method for forming a coating film according to the present invention comprises the following steps 1 to 5: The substrate was coated with aqueous white primer No. However, this jls considered due to a fact that the raw material powder prepared by the direct nitriding method is difficult to sinter without a sintering additive.

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Double-sided adhesive tape for manufacturing a liquid crystal panel brightness having light reflectivity and ijs properties. Heretofore, in semiconductor apparatuses, such as, etching apparatuses, chemical vapor deposition apparatuses and the like, so-called stainless heaters and indirect heating system heaters have been generally used.

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Especially preferred examples of the chlorinated polyolefin are chlorinated polyethylene, chlorinated polypropylene, chlorinated ethylene-propylene copolymer, chlorinated ethylene-vinyl acetate copolymer, and the like.

Table 6 shows the results of the performance tests of the multilayer coating films. As seen from Table 1, when the powder of aluminum nitride prepared by direct nitriding method was used, the obtained sintered bodies assume gray, pale brown or white color tone and have high lightnesses, so that they are inferior in heat radiation property. The results were evaluated according to the following criterion.

The present invention relates to a method for forming a coating film on a plastic substrate. The powder was then monoaxially press formed to prepare preliminarily shaped bodies which were then hot press fired in a nitrogen atmosphere.

Date of ref document: Aluminum nitride sintered body and semiconductor manufacturing apparatus member. As a result of measurement by the above described method, the sintered body obtained after the heat treatment had an average particle diameter of 4. In the process of studying aluminum nitride sintered bodies, the inventors have succeeded in providing an aluminum nitride sintered body wherein metal elements, such as a sintering additive, are substantially absent except for aluminum, and which assumes black color of a lightness of not more than N 4 according to the s of JIS Z showing black gray color 871 black brown color of an extremely low lightness.

A chlorinated polyolefin is a chlorinated product of a polyolefin, and examples of x base polyolefin encompass radical homopolymers or copolymers of at least one kind of olefin selected from ethylene, propylene, butene, methylbutene, isoprene, etc. Forty iis of ethylene glycol monobutyl ether and 30 parts of isobutyl alcohol were placed in a reaction vessel equipped with a stirrer, a thermometer, a reflux condenser etc.

Technical Field The present invention relates to an aluminum nitride sintered body and its production method.

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The aluminum nitride sintered body of claim 4, comprising an average particle diameter of crystal grains for constituting the sintered body of at least 1. These crosslinking agents are preferably used in an amount of 0 to about 50 parts by weight, particularly about 5 to about 40 parts by weight, per parts by weight of the total solids of the resin component containing chlorinated polyolefin.

The amount thereof required is large, resulting in an unstable coating composition or involving high cost. Production Example 3 Production of Acrylic Resin Solution for Aqueous Coating Composition Forty parts of ethylene glycol monobutyl ether and 30 parts of isobutyl alcohol were placed in a reaction vessel equipped with a stirrer, a thermometer, a reflux condenser etc. Preferably, the crystal grains constituting the 87211 nitride sintered body have an average particle diameter of at least 0.

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EP0743290A1 – Aluminum nitride sinter and production method therefor – Google Patents

In case when measuring a lightness of an actual sintered body, pieces of paper of standard colors of lightnesses of N 0 – N 10 are compared with the surface color of the sintered body to determine the lightness of the sintered body. Also usable as a crosslinking agent are epoxy resins of glycidyl etherified bisphenol, the hydrogenated product thereof, epoxy resins of glycidyl etherified aliphatic polyhydric alcohols, glycidyl ester based epoxy resins, alicyclic epoxy resins and the like.

As processes of producing a raw material powder of the aluminum nitride sintered body, there are known a reduction nitriding method and direct nitriding method. Examples of the polymerizable vinyl monomers other than polymerizable epoxy-containing monomers are meth acrylic acid alkyl ester, acrylonitrile, styrene, vinyl acetate, vinyl chloride and the like. R Ref document number: Examples thereof include various plastic materials used for the exterior parts of a car, such as bumpers, spoilers, grilles, fenders and the like, the outside parts of a household electrical appliance, and so on.

A light-colored film with a pearly white tone, for instance, can be easily formed on the plastic substrate. Therefore, it is suited most as materials for high purity processes.

The white pigment is used usually in an amount of about 50 to about parts by weight, and preferably about 70 to about parts by weight, per parts by weight of solids of the resin component containing chlorinated polyolefin and optional modifier resin. For example, it can be a cause of defects of the product semiconductors. The infrared radiation beams emitted from the infrared radiation lamps were directly or after reflected from the reflection plate passed through a round quartz window of a diameter of mm and a thickness of 5 mm arranged in the vacuum chamber, reached to the aluminum nitride plate to heat the plate.

The obtained polymer preferably has an epoxy equivalent of about 20 to about 2, particularly about 30 to about and a number average molecular weight of about 3, to about , particularly about 4, to about 50, The method for forming a coating film according to the above item 1, wherein the aqueous white primer A comprises a chlorinated polyolefin, white pigment and water.

In Example 3, the obtained sintered body had a relative density of