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US 2014/0155573 A1Published application
Process for purifying poly (alkylene carbonate)
AssigneeNorner IP AS
InventorsCarlos Barreto Soler, Siw Bodil Fredriksen, Espen Ommundsen
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Abstract
A process for purifying a poly(alkylene carbonate), said process comprising the steps of adding said poly(alkylene carbonate) to an aqueous solution, optionally in the presence of an acid compound, in the absence of any organic solvent. subsequently heating said blend to a temperature of up to 200° C.; and removing the aqueous phase and drying the residue.
Claims21
A process for purifying a poly(alkylene carbonate), said process comprising the steps of:
- (i) adding said poly(alkylene carbonate) to water in the absence of any organic solvent to form a solid:liquid blend, said poly(alkylene carbonate) having a particle size less than 20 mm;
- (ii) heating said blend to a temperature of up to 200° C.;
- and
- (iii) removing the aqueous phase and optionally drying the residue.
1 more element
A process for purifying a poly(alkylene carbonate), said process comprising the steps of:
- (i) adding said poly(alkylene carbonate) to an aqueous acid solution in the absence of any organic solvent;
- (ii) heating said blend to a temperature of up to 200° C.;
- and
- (iii) removing the aqueous phase and optionally drying the residue.
1 more element
A process comprising:
- (a) reacting carbon dioxide with a cyclic ether in the presence of a catalyst and an organic solvent so as to form a poly(alkylene carbonate);
- (b) removing said organic solvent to leave a crude poly(alkylene carbonate);
- (c) optionally converting said poly(alkylene carbonate) into particles having a particle size less than 20 mm;
- (d) adding said crude poly(alkylene carbonate) to water, optionally in the presence of an acid, in the absence of any organic solvent to form a solid:liquid blend, and
- (e) removing the aqueous phase and optionally drying the residue.
2 more elements
(canceled)
Dependencies are inferred from the claim text.