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Patent Searching and Data


Title:
SHEET CONTAINING POLYVINYL ACETAL
Document Type and Number:
WIPO Patent Application WO/2015/040663
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a sheet which is produced using a plasticizer having a high boiling point and low polarity and has a relatively high water content, and which, when used as an intermediate film for a combined glass after being stored for a long period, can have adhesion to the glass and appearance at the same levels as those achieved before the storage of the sheet. Provided is a sheet comprising polyvinyl acetal, a plasticizer having a molecular weight of 380 or more and a silicon-containing compound, wherein the plasticizer having a molecular weight of 380 or more is contained in an amount of 30 to 70 parts by mass relative to 100 parts by mass of polyvinyl acetal and the thickness of the sheet is 0.2 to 2 mm. When the sheet is analyzed by an ICP emission spectrometry method, 0.10 to 30 ppm of silicon is detected. When a cross section of the sheet which is taken in a direction that is parallel with the direction of the thickness of the sheet is subjected to a TOF-SIMS measurement, the number of detected silicon secondary ions meets a specified requirement.

Inventors:
ASANUMA YOSHIAKI (JP)
MIHARA ICHIRO (JP)
Application Number:
PCT/JP2013/074971
Publication Date:
March 26, 2015
Filing Date:
September 17, 2013
Export Citation:
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Assignee:
KURARAY CO (JP)
International Classes:
C08J5/18; B32B17/10; C03C27/12; C08K3/24; C08K5/103; C08K5/54; C08L29/14
Foreign References:
JPH06127982A1994-05-10
JP2010523449A2010-07-15
JP2012025645A2012-02-09
JP2002505210A2002-02-19
JP2001192245A2001-07-17
Attorney, Agent or Firm:
LIGHTHOUSE INTERNATIONAL PATENT FIRM (JP)
Patent business corporation lighthouse international patent firm (JP)
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