公开(公告)号：EP0701580A1

公开(公告)日：1996-03-20

申请号：EP94917074.0

申请日：1994-06-01

申请人： ZENECA LIMITED

发明人： LIGGAT, John Jamieson ,  O'BRIEN, Gregory

IPC分类号： C08K5 ,  B29C71 ,  C08G63 ,  C08L67

CPC分类号： C08G63/88 ,  B29C71/02 ,  B29K2067/00 ,  C08G63/06 ,  Y10S264/901 ,  Y10S264/904

摘要： Method of retarding age embrittlement of polyester comprising heat treating the polyester after preparation by cooling below 90 °C and then heating at 90 °C to 160 °C within 24 hours of preparation, and a polyester composition in which ageing is substantially retarded compared to the non-heat treated polyester. The invention encompasses the polyester composition which has been subjected to the method.

摘要翻译： 延迟聚酯老化的方法，包括在制备之后通过冷却低于90℃热处理聚酯，然后在制备后24小时内在90℃加热至160℃，以及聚酯组合物，其中老化明显延迟 未经热处理的聚酯。 本发明包括已经经过该方法的聚酯组合物。

公开(公告)号：EP0701582A1

公开(公告)日：1996-03-20

申请号：EP94917076.0

申请日：1994-06-01

申请人： ZENECA LIMITED

发明人： LIGGAT, John Jamieson ,  O'BRIEN, Gregory

IPC分类号： C12N1 ,  B29C71 ,  C08G63 ,  C08J5

CPC分类号： C08G63/88 ,  B29C71/02 ,  B29K2067/00

摘要： Process for improving mechanical properties of an aged polyester composition consisting essentially of copolymer of hydroxybutyrate units and hydroxyvalerate units which comprises heating the polyester at a temperature whereby (i) the polyester is restored to its original non-aged properties, and (ii) subsequent ageing of the polyester is retarded as indicated by substantial improvement of at least one measurement indicative of ageing compared to non heat treated polyester of the same age. The invention includes the polyester composition and shaped articles which have been subjected to the process and in which ageing is retarded.

公开(公告)号：EP0701581A1

公开(公告)日：1996-03-20

申请号：EP94917075.0

申请日：1994-06-01

申请人： ZENECA LIMITED

发明人： LIGGAT, John Jamieson ,  O'BRIEN, Gregory

IPC分类号： C08K5 ,  B29C71 ,  C08G63 ,  C08L67

CPC分类号： B29C71/02 ,  B29K2067/00 ,  C08G63/88

摘要： A process for improving mechanical properties of an aged polyester composition comprising at least one polyhydroxyalkanoate (PHA) and at least one plasticiser thereof, which comprises heating at a temperature whereby (i) the polyester is restored to its original non-aged properties, and (ii) subsequent ageing of the polyester is retarded as indicated by substantial improvement of at least one measurement indicative of ageing compared to non heat treated polyester of the same age. The invention includes a polyester composition and shaped articles which have been subjected to the process and in which ageing is retarded.