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1.发明专利
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公开(公告)号：JP5443765B2
公开(公告)日：2014-03-19
申请号：JP2008555061
申请日：2008-01-22
Applicant: 株式会社クレハ
CPC classification number: C08L67/02 , C08K5/0091 , C08K2201/008 , C08L67/04 , C08L2666/18
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公开(公告)号：JP5395349B2
公开(公告)日：2014-01-22
申请号：JP2007306249
申请日：2007-11-27
Applicant: 株式会社クレハ
IPC: C08J9/00
CPC classification number: B01D67/0034 , B01D67/0023 , B01D71/48 , B01D2323/42 , B29C67/20 , Y10T428/24273
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公开(公告)号：JP5296842B2
公开(公告)日：2013-09-25
申请号：JP2011155157
申请日：2011-07-13
Applicant: 株式会社クレハ
IPC: C07D319/12
CPC classification number: C08J3/28 , C07D319/12 , C08J11/24 , C08J2300/14 , C08J2367/04 , Y02W30/706
Abstract: The present invention provides a process for production of a cyclic ester by depolymerization of an aliphatic polyester. In the process, a mixture containing the aliphatic polyester and a specific polyalkylene glycol ether, which has a boiling point of 230-450 DEG C and a molecular weight of 150-450, is heated under normal or reduced pressure to a temperature at which depolymerization of the aliphatic polyester takes place. Then, a substantially homogeneous solution phase, consisting of the melt phase of the aliphatic polyester and the liquid phase of the polyalkylene glycol ether, is formed. Heating of the solution phase is continued to form the cyclic ester by depolymerization and distil out the cyclic ester together with the polyalkylene glycol ether, and then the cyclic ester is recovered from the distillate. The present invention also provides a process for purification of a crude cyclic ester by use of the specific polyalkylene glycol ether described above.
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Patent Agency Ranking
公开(公告)号：JP4750256B2
公开(公告)日：2011-08-17
申请号：JP2000320828
申请日：2000-10-20
Applicant: 株式会社クレハ
IPC: C07D319/12
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公开(公告)号：JP4565208B2
公开(公告)日：2010-10-20
申请号：JP2000096713
申请日：2000-03-31
Applicant: 株式会社クレハ
IPC: C07D319/12 , B01D9/00
CPC classification number: C07D319/12 , B01D9/00 , B01D9/0004 , B01D9/004 , B01D9/005
Abstract: It is an object of the present invention to provide a method of refining continuously the crystal of a crude cyclic ester effectively in a simple manner. A method of refining a crystal of a crude cyclic ester comprises the steps of supplying the crude cyclic ester to a vertically extending cylindrical refiner (1) from an inlet (3) provided at a lower part of the refiner (1), agitating the crude cyclic ester by an agitator provided in the refiner (1) to make the crude cyclic ester flow upwardly, refining the crystals of the crude cyclic ester by counterflow-contact between the upflowing crude cyclic ester and a downflowing melted liquid containing a refined crystal component, and taking out refined crystals of the crude cyclic ester from an outlet (4) provided at an upper part of the refiner (1).
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公开(公告)号：JPWO2008004490A1
公开(公告)日：2009-12-03
申请号：JP2008523662
申请日：2007-06-28
Applicant: 株式会社クレハ
IPC: C08L67/04 , C08K5/1515 , C08K5/34 , C08K5/52 , C08L63/00 , C08L101/16
CPC classification number: C08J3/203 , C08J3/201 , C08J2367/04 , C08K5/29 , C08K5/52 , C08L67/04 , C08L2666/18
Abstract: 熱安定剤の存在下で、ポリグリコール酸と、重量平均分子量が5万以下のポリ乳酸を溶融混練することにより、ポリグリコール酸の単独成形あるいは他の熱可塑性樹脂との複合成形において問題となっていたポリグリコール酸の過早結晶性を緩和し、より低下し、かつ広範囲で制御可能な結晶化速度を有するポリグリコール酸系脂肪族ポリエステル組成物を得る。
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公开(公告)号：JP4317690B2
公开(公告)日：2009-08-19
申请号：JP2002569828
申请日：2002-03-05
Applicant: 株式会社クレハ
IPC: C07D319/12 , C07B61/00 , C08G63/08
CPC classification number: C07D319/12 , C08G63/08
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