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Patent Searching and Data


Title:
POLYVINYL ACETAL RESIN
Document Type and Number:
WIPO Patent Application WO/2021/060499
Kind Code:
A1
Abstract:
The present invention provides a polyvinyl acetal resin: which leaves few fine undissolved substances when dissolved in an organic solvent; by which the productivity can be improved when used particularly as a binder for a ceramic green sheet; from which a ceramic green sheet having excellent toughness can be obtained; and with which a laminated ceramic capacitor having excellent reliability can be manufactured. The present invention is a polyvinyl acetal resin in which the wave number A (cm-1) of a peak within a wave number range of 3,100-3,700 cm-1 and the amount (mol%) of hydroxyl groups in the IR absorption spectrum measured by an infrared spectrophotometer satisfy the relationships of expressions (1) and (2). [(3470-A)/amount of hydroxyl groups]≤5.5 (1) (3470-A)≤185 (2) A is a wave number on a low wave number side less than 3,470 cm-1, among wave numbers exhibiting transmittance a (%) satisfying [100-(100-X/2)] when the minimum transmittance of a peak within a wave number range of 3,100-3,700 cm-1 is denoted by X (%).

Inventors:
NAKAMURA KAZUTO (JP)
ARAI YOSHITO (JP)
HIGUCHI ISAO (JP)
Application Number:
PCT/JP2020/036374
Publication Date:
April 01, 2021
Filing Date:
September 25, 2020
Export Citation:
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Assignee:
SEKISUI CHEMICAL CO LTD (JP)
International Classes:
C08F8/28; C04B35/634; C08F16/38; H01G4/30
Domestic Patent References:
WO2013024887A12013-02-21
WO2013153873A12013-10-17
Foreign References:
JPS581766A1983-01-07
JPS6322882A1988-01-30
JP2015067707A2015-04-13
JP2007138114A2007-06-07
JP2003155332A2003-05-27
JP2005325342A2005-11-24
Other References:
See also references of EP 3981800A4
Attorney, Agent or Firm:
YASUTOMI & ASSOCIATES (JP)
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