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AssigneeDaicel Chemical Industries, Ltd.
InventorsTakuzo Aida, Jun Watanabe
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The present invention relates to a method for preparing lactone polymers, carbonate polymers, lactone-carbonate block copolymers and lactone-arbonate random copolymers via a ring-opening addition reaction of a lactone monomer, a cyclic carbonate monomer or a mixture thereof using an initiator and in the presence of a specific titanium-type Lewis acid catalyst. The resulting polymers have a molecular weight distribution (Mw/Mn) approximately equal to 1 or a extremely high purity of single-structure components. The polymer molecules range in an oligomer region to a molecular weight of approximately 200,000. The present invention also relates to a method for preparing lactone polymers, carbonate polymers and lactone-carbonate copolymers having a narrow molecular weight distribution and which can be obtained via a continuous polymerisation of a lactone monomer and/or a cyclic carbonate monomer using an initiator in an extruder in the presence of a specific titanium-type Lewis acid catalyst or an aluminium-type Lewis acid catalyst. The present invention also relates to these resulting polymers.
A method for preparing a monodispersed polymer via a ring-opening addition-reaction between a lactone monomer (b1), a cyclic carbonate monomer (b2) or a mixture (b3) of said lactone monomer (b1) and said cyclic carbonate monomer (b2), using an initiator (a), said method being characterized in that a titanium-type Lewis acid of General Formula T1 is used as a catalyst
A method for preparing a lactone-carbonate random copolymer via a ring-opening addition reaction of a lactone monomer (b1) and a cyclic carbonate monomer (b2) with an initiator (a) until any one of said monomers is consumed and then by undertaking a ring-opening addition reaction of said remaining monomer, said method being characterized in that the titanium-type Lewis acid of General Formula T1 is used as catalyst
A method for preparing lactone polymers characterised in that a lactone monomer (b1), a cyclic carbonate monomer (b2) or a mixture (b3) thereof are continuously polymerized using an initiator (a) in an extruder via a ring-opening addition reaction and using the aluminium-type Lewis via a ring-opening addition reaction and using the aluminium-type Lewis acid of General Formula A1 or the titanium-type Lewis acid of General Formula T1 as catalyst
Lactone polymers, cyclic carbonate polymers and lactone-cyclic carbonate copolymers having a weight-average molecular-weight (Mw) of 10,000 to 200,000 and a weight-average molecular-weight (Mw)/number-average molecular-weight (Mn) ratio of 1.0 to 2.5.
Lactone-cyclic carbonate block copolymers having a weight average-molecular weight (Mw) of 30,000 to 200,000.
Lactone-cyclic carbonate random copolymers having a weight average-molecular weight (Mw) of 10,000 to 200,000.
Dependencies are inferred from the claim text.