公开(公告)号：EP4324859A1

公开(公告)日：2024-02-21

申请号：EP22788010.1

申请日：2022-03-28

申请人： Kuraray Co., Ltd.

发明人： HIRAOKA, Nobutaka ,  TAKASUGI, Akio ,  NIIMURA, Takuro ,  NAKAHARA, Atsuhiro ,  SUGII, Hiroaki ,  ASANUMA, Yoshiaki

IPC分类号： C08F8/28 ,  B32B17/10 ,  B32B27/28 ,  C03C27/12 ,  C08F216/38 ,  C08L29/14

摘要： The present invention relates to an acetalization product of an ethylene/vinyl alcohol copolymer, comprising: 20 to 80 mol% of an ethylene unit; and 4 to 76 mol% of a vinyl alcohol unit based on a total monomer unit constituting the acetalization product, wherein a degree of acetalization is 5 to 80 mol%, and expression (1): 0.75 ≤ W 0.05h /2f ≤ 1.00 (1) [wherein W 0.05h /2f represents a symmetry factor determined by reversed-phase partition gradient high-performance liquid chromatography analysis with a water-ethanol eluent, according to JIS K 0124:2011], and expression (2): 1.27 ≤ Tm/Tg ≤ 1.35 (2) [wherein Tm and Tg respectively represent a melting peak temperature (kelvin) and an intermediate glass transition temperature (kelvin) measured according to JIS K7121:2012] are satisfied.

公开(公告)号：EP4324798A1

公开(公告)日：2024-02-21

申请号：EP22788011.9

申请日：2022-03-28

申请人： Kuraray Co., Ltd.

发明人： TAKASUGI, Akio ,  NIIMURA, Takuro ,  NAKAHARA, Atsuhiro ,  ASANUMA, Yoshiaki

IPC分类号： C03C27/12 ,  C08J3/12

摘要： The present invention relates to a method for producing an acetalization product of an ethylene/vinyl alcohol copolymer by acetalization of an ethylene/vinyl alcohol copolymer, wherein the ethylene/vinyl alcohol copolymer is a porous object.

公开(公告)号：EP4092003A1

公开(公告)日：2022-11-23

申请号：EP20914144.9

申请日：2020-12-18

申请人： Kuraray Co., Ltd.

发明人： NIIMURA, Takuro ,  TAKASUGI, Akio ,  NAKAHARA, Atsuhiro ,  ASANUMA, Yoshiaki

IPC分类号： C03C27/12 ,  C08F8/28

摘要： The present invention relates to a resin composition, comprising:
a modified vinyl acetal resin which comprises 20 to 80 mol% of ethylene units and 4 to 76 mol% of vinyl alcohol units based on all monomer units constituting the resin, and has an acetalization degree of 5 to 80 mol%; and
an alkali metal salt and/or an alkaline earth metal salt of a strong acid,
wherein a total content of the alkali metal salt and/or the alkaline earth metal salt of the strong acid is 0.0005 to 0.06 part by mass with respect to 100 parts by mass of the modified vinyl acetal resin.

公开(公告)号：EP3950628A1

公开(公告)日：2022-02-09

申请号：EP20777029.8

申请日：2020-03-18

申请人： Kuraray Co., Ltd.

发明人： NIIMURA, Takuro ,  TAKASUGI, Akio ,  NAKAHARA, Atsuhiro ,  ASANUMA, Yoshiaki

IPC分类号： C03C27/12 ,  B32B17/10 ,  C08F8/28 ,  C08F210/02 ,  C08F216/38 ,  C08J5/18 ,  C08L29/14

摘要： The problem to be solved of the present invention is to provide a modified vinyl acetal resin for an interlayer film of laminated glass having excellent transparency, impact resistance, heat resistance and molding ability. The means for solving the problem is a modified vinyl acetal resin for an interlayer film of laminated glass comprising 25 to 60mol% of ethylene units and 24 to 71% by mol of vinyl alcohol units, based on all the monomer units constituting the resin, and having the acetalization degree of 5mol% or more and less than 40mol%.