Casting film for producing ceramic green sheet

• US 6,410,157 B1
• Filed: 06/19/2001
• Issued: 06/25/2002
• Est. Priority Date: 07/06/2000
• Status: Expired due to Term

• Current Assignee: Lintec Corporation
• Original Assignee: Lintec Corporation
• Inventors: Nakamura, Toru, Shibano, Tomishi
• Primary Examiner(s): Chen, Vivian
• Application Number:
  US09/883,257
• Publication Number:
  US 20020022141A1
• Time in Patent Office: 371 Days
• Field of Search: 928/41.5, 928/41.8, 928/480, 928/482, 928/483, 928/520
• US Class Current: 428/482
• CPC Class Codes: B32B 27/30 comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: C04B 35/62218 obtaining ceramic films, e.g. by using temporary supports
• CPC Class Codes: Y10T 428/1462 Polymer derived from material having at least one acrylic or alkacrylic group or the nitrile or amide derivative thereof [e.g., acrylamide, acrylate ester, etc.]
• CPC Class Codes: Y10T 428/1476 Release layer
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31794 Of cross-linked polyester
• CPC Class Codes: Y10T 428/31797 Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31928 Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31935 Ester, halide or nitrile of addition polymer

Abstract

There is disclosed a casting film which is used for producing a ceramic green sheet and which comprises a substrate film (e.g. polyethylene terephthalate film) and a releasing layer formed thereon comprising a cured resin from (A) a stearic acid-modified alkyd resin and/or a stearic acid-modified acrylic resin and a (B) amino resin (e.g. melamine resin, urea resin and urea-melamine resin, each being etherified by a lower alcohol). The above casting film has excellent wettability of ceramic slurry and moderate releasability for the ceramic green sheet without the occurrence of repelling at the time of applying coating, and is well suited for use in the production of ceramic green sheets that are employed for ceramic capacitors, laminated inductor elements, etc.

Claims

1. A casting film which is used for producing a ceramic green sheet and which comprises a substrate film and a releasing layer formed on at least either side thereof, wherein said releasing layer comprises a cured resin from (A) a stearic acid-modified alkyd resin and/or a stearic acid-modified acrylic resin and a (B) amino resin.

2. The casting film for producing a ceramic green sheet according to claim 1, wherein the stearic acid-modified alkyd resin has a stearyl group content of 40 to 60% by weight, and/or the stearic acid-modified acrylic resin has a stearyl group content of 20 to 40% by weight.

3. The casting film for producing a ceramic green sheet according to claim 1, wherein the (B) amino resin is at least one member selected from the group consisting of melamine resin, urea resin and urea-melamine resin, each being etherified by a lower alcohol.

4. The casting film for producing a ceramic green sheet according to any one of claims 1, 2 and 3, wherein the content of the component (B) is 5 to 40% by weight based on the total sum of the solid content of the components (A) and (B).

5. The casting film for producing a ceramic green sheet according to claim 1, wherein the substrate film comprises polyethylene terephthalate.

6. The casting film for producing a ceramic green sheet according to claim 1, wherein the component (A) is composed of the mixture of the stearic acid-modified alkyd resin and the stearic acid-modified acrylic resin.

7. The casting film for producing a ceramic green sheet according to claim 1, wherein the cured resin is formed in the presence of an acid catalyst.