公开(公告)号：AU779638B2

公开(公告)日：2005-02-03

申请号：AU2522100

申请日：2000-03-31

Applicant: AGENCY IND SCIENCE TECHN

Inventor： OISHI AKIHIRO ,  TAGUCHI YOICHI ,  FUJITA KENICHI ,  IKEDA YOSHIKAZU ,  MASUDA TAKASHI ,  ISHIGAMI YUTAKA ,  NAKAYAMA KAZUO ,  KINUGASA SHINICHI ,  NAKAHARA HISAE

IPC: C08G63/08 ,  C08G63/78 ,  C08G63/82 ,  C08L101/16

Abstract: A process of producing a polyester or copolyester, wherein at least one cyclic lactone of the following formula (I): wherein n is an integer of 1-4 provided that n is not 2 when only one cyclic lactone is used, is polymerized under a pressure of at least 200 MPa in the absence of any catalyst or in the presence of a metal-free polyesterification catalyst.

公开(公告)号：JP2000281764A

公开(公告)日：2000-10-10

申请号：JP9339799

申请日：1999-03-31

Applicant: AGENCY IND SCIENCE TECHN

Inventor： OISHI AKIHIRO ,  TAGUCHI YOICHI ,  FUJITA KENICHI ,  IKEDA YOSHIKAZU ,  MASUDA TAKASHI ,  ISHIGAMI YUTAKA ,  NAKAYAMA KAZUO ,  KINUGASA SHINICHI ,  NAKAHARA HISAE

IPC: C08G63/08 ,  C08G63/78 ,  C08G63/82 ,  C08L101/16

Abstract: PROBLEM TO BE SOLVED: To provide a process for preparing a polymer polyester or polyester copolymer from a cyclic lactone through ring-opening polymerization. SOLUTION: In a preparation process of a polymer polyester, a cyclic lactone of the formula (wherein, (n) is 1, 3 or 4) is allowed to react under a high- pressure condition of at least 200 MPa without using a catalyst. Alternatively, in the absence of catalysts or in the presence of a non-metal esterification catalyst, a lactone mixture comprising two or more cyclic lactones of the formula is allowed to react under a high-pressure condition of at least 200 MPa.

公开(公告)号：JPH10306062A

公开(公告)日：1998-11-17

申请号：JP11698797

申请日：1997-05-07

Applicant: AGENCY IND SCIENCE TECHN

Inventor： NAKAWA YOSHINOBU ,  BABA TERUHIKO ,  KINUGASA SHINICHI ,  NAKANISHI HIROSHI

IPC: G01N33/544 ,  C07C68/02 ,  C07C69/96 ,  C07J7/00

Abstract: PROBLEM TO BE SOLVED: To provide a novel sterol derivative that is useful for producing vesicles of good stability. SOLUTION: This compound is a sterol derivative represented by the formula (n is 4-8; R and R' are each a sterol having OH in the 3β-position), typically α,ω-bis(cholesteryloxycarbonly)hexaethylene-glycol. The sterol derivative of the formula is prepared by reaction of an oligoethylene glycol and a sterol halognoformate. When vesicles are produced, the sterol derivative of the formula is mixed with a cation, or with a phospholipid, or with a long-chain aliphatic amine or with a surfactant. The vesicles prepared from this cholesterol derivative can include a variety of hydrophilic substances.