폴리비닐아세탈 수지

• Main Authors: NAKAMURA KAZUTO, ARAI YOSHITO, HIGUCHI ISAO
• Format: Patent
• Language: Korean
• Published: 27.05.2022
• Subjects: ARTIFICIAL STONE; BASIC ELECTRIC ELEMENTS; CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; ELECTRICITY; LIME, MAGNESIA; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; REFRACTORIES; SLAG; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF NATURAL STONE

본 발명은, 유기 용제에 용해했을 경우에 미세한 미용해물이 적고, 특히 세라믹 그린 시트용의 바인더로서 사용했을 때에 생산성을 향상시킬 수 있고, 또, 강인성이 우수한 세라믹 그린 시트를 얻을 수 있어, 신뢰성이 우수한 적층 세라믹 콘덴서를 제작 가능한 폴리비닐아세탈 수지를 제공한다. 본 발명은, 적외 분광 광도계에 의해 측정한 IR 흡수 스펙트럼에 있어서, 파수 3100 ∼ 3700 ㎝-1 의 범위 내에 있어서의 피크의 파수 A (㎝-1), 및, 수산기량 (몰％) 이 하기 식 (1) 및 (2) 의 관계를 만족하는, 폴리비닐아세탈 수지이다. [(3470 - A)/수산기량] ≤ 5.5 (1) (3470 - A) ≤ 185 (2) A : 파수 3100 ∼ 3700 ㎝-1 의 범위 내에 있어서의 피크의 최소 투과율을 X (％) 로 했을 때, [100 - (100 - X)/2] 를 만족하는 투과율 a (％) 를 나타내는 파수 가운데, 3470 ㎝-1 보다 저파수측의 파수 The present invention provides a polyvinyl acetal resin which leaves less fine undissolved matter when dissolved in an organic solvent and thus can improve productivity particularly when used as a binder for a ceramic green sheet, and which can also provide a ceramic green sheet having excellent toughness and enables production of a highly reliable multilayer ceramic capacitor. Provided is a polyvinyl acetal resin having: a wavenumber A (cm-1) of a peak within a range of 3,100 to 3,700 cm-1 in an IR absorption spectrum measured using an infrared spectrophotometer; and a hydroxy group content (mol%), the wavenumber A of the peak and the hydroxy group content satisfying relations of the following formulas (1) and (2): 3,470−A/Hydroxygroupcontent≤5.53,470−A≤185 wherein A is a wavenumber which is lower than 3,470 cm-1 and at which a transmittance a (%) satisfying [100 - (100 - X)/2] is exhibited, where X (%) is a minimum transmittance of the peak within the wavenumber range of 3,100 to 3,700 cm-1.