Process for the production of polyesters
AssigneeNovamont S.p.A.
InventorsFederico Faiella, Tiziana Milizia, Roberto Vallero
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Abstract
This invention relates to a process for the production of polyesters comprising an esterification/transesterification stage and a polycondensation stage, characterized in that the said polycondensation stage is carried out in the presence of a catalyst comprising a mixture of at least one Titanium-based compound and at least one Zirconium-based compound in which the Ti/(Ti+Zr) ratio by weight is equal to or greater than 0.01 and equal to or less than 0.40.
Claims20
A process for the production of a polyester comprising:
- a) a dicarboxylic component comprising:
- 100% mol of units deriving from at least one aliphatic dicarboxylic acid,
- b) a diol component comprising units deriving from at least one aliphatic diol;
- said process comprising an esterification step and a following polycondensation step, wherein said polycondensation step is performed in the presence of a catalyst comprising a mixture of at least one Titanium-based compound and at least one Zirconium-based compound in which the weight ratio Ti/(Ti+Zr) is equal to or higher than 0.01 and equal to or lower than 0.40.
A process for producing a polyester which comprises using a catalyst comprising a mixture of at least one Titanium-based compound and at least one Zirconium-based compound in which the weight ratio Ti/(Ti+Zr) is equal to or higher than 0.01 and equal to or lower than 0.4, wherein the polyester comprises:
- a) a dicarboxylic component comprising:
- 100% mol of units deriving from at least one aliphatic dicarboxylic acid,
- b) a diol component comprising units deriving from at least one aliphatic diol.
Dependencies are inferred from the claim text.