Catalysts for solvolysis of polyester
AssigneeAgency for Science, Technology and Research
InventorsCun Wang, Jui Hsien Michelle Ong, Martin Van Meurs, Ludger Paul Stubbs
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Abstract
Disclosed herein is a process and a catalysis for the solvolysis of a polyester. The process comprises (a) mixing the polyester with a solvolysis reagent and the catalyst, wherein the catalyst comprises: a cation of formula Ia: [PR1R2R3R4]+, wherein each of R1, R2, R3 and R4 is independently selected from a linear or branched C1 to C20 alkyl group; or wherein R1 and R2 and/or R3 and R4 together form an alkylene chain —(CH2)p— where p is from 3 to 6, such that R1 and R2 and/or R3 and R4 form, together with the phosphorous atom that they are attached to, a cyclic ring; and an anion; and (b) heating the mixture to a predetermined temperature.
Claims20
A process for the solvolysis of a polyester, the process comprising:
- (a) mixing the polyester with a solvolysis reagent and a catalyst, wherein the catalyst comprises:
- a cation of formula Ia:
- wherein each of R1, R2, R3 and R4 is independently selected from a linear or branched C1 to C20 alkyl group;
- or
- wherein R1 and R2 and/or R3 and R4 together form an alkylene chain —(CH2)p— where p is from 3 to 6, such that R1 and R2 and/or R3 and R4 form, together with the phosphorous atom that they are attached to, a cyclic ring;
- and
- an anion;
- and
- (b) heating the mixture to a predetermined temperature.
A catalyst for the solvolysis of a polyester, the catalyst comprises:
- a cation of formula Ia:
- wherein R1, R2, Ra and R4 are independently a linear or branched C1 to C20 alkyl group;
- or
- wherein R1 and R2 and/or R3 and R4 together form an alkylene chain —(CH2)p— where p is from 3 to 6, such that R1 and R2 and/or R3 and R4 form, together with the phosphorous atom that they are attached to, a cyclic ring;
- and
- an anion,
- wherein the anion is selected from the group consisting of an alkoxide, a phenoxide, a carbonate, a bicarbonate and a sulfonate.
Dependencies are inferred from the claim text.