Lactone polymer
First Claim
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1. A process for the preparation of lactone polymers, which comprises subjecting a lactone to ring-opening polymerization in the presence of 0.1 to 50 ppm of a stannous halide selected from the group consisting of stannous chloride, stannous bromide and stannous iodide, to form a lactone polymer in which the ratio of the weight average molecular weight to the number average molecular weight is in the range of from 1.1 to 2.0 and the molecular weight is 500 to 5,000.
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Abstract
A lactone polymer has a narrow molecular weight distribution where a ratio of the weight average molecular weight to the number average molecular weight is in the range of from 1.1 to 2.0 and the molecular weight is 500 to 5,000.
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Citations
2 Claims
- 1. A process for the preparation of lactone polymers, which comprises subjecting a lactone to ring-opening polymerization in the presence of 0.1 to 50 ppm of a stannous halide selected from the group consisting of stannous chloride, stannous bromide and stannous iodide, to form a lactone polymer in which the ratio of the weight average molecular weight to the number average molecular weight is in the range of from 1.1 to 2.0 and the molecular weight is 500 to 5,000.
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Current AssigneeDaicel Chemical Industries Limited (Daicel Corporation)
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Original AssigneeDaicel Chemical Industries Limited (Daicel Corporation)
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InventorsWatanabe, Shoji, Fujii, Tatsumi, Miho, Takuya
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Primary Examiner(s)Nielsen, Earl A.
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Application NumberUS06/352,607Time in Patent Office413 DaysField of Search528/354, 528/355, 528/357, 560/185US Class Current528/357CPC Class CodesC08G 18/4277 Caprolactone and/or substit...C08G 63/08 Lactones or lactidesC08G 63/823 for the preparation of poly...
