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US 10,767,006 B2Granted
Hydrogenation of tyrosine derived polyarylates
AssigneeMedtronic, Inc.
InventorsSatish Pulapura, Dan Thanh Le, Xiangji Chen, Suping Lyu, Fatima Buevich
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Abstract
A method for hydrogenating tyrosine derived polyarylates includes dissolving a second polyarylate with DMF in a flask to produce a first solution. A catalyst is added to the first solution to produce a polymer solution. The polymer solution is filtered through a Celite bed to produce a filtrate. The filtrate is added to water and stirred to precipitate the polyarylate.
Claims21
A method for synthesizing a polyarylate having the formula:
- the method comprising:
- dissolving a second polyarylate having the formula:
- with DMF in a flask to produce a first solution;
- starting a flow of nitrogen;
- adding a catalyst to the first solution to produce a polymer solution;
- starting a flow of hydrogen;
- filtering the polymer solution through a filtration agent to produce a filtrate;
- and
- adding the filtrate to water and stirring to precipitate the polyarylate,
- wherein a first amount of the catalyst is added to the first solution to produce a first catalyst suspension,
- wherein a second amount of the catalyst is added to the first catalyst suspension to produce a second catalyst suspension, and
- wherein a third amount of the catalyst is added to the second catalyst suspension to produce a third catalyst suspension.
9 more elements
A method for synthesizing a polyarylate having the formula:
- the method comprising:
- dissolving a second polyarylate having the formula:
- with DMF in a flask to produce a first solution, the first solution comprising DMF and a solvent, the solvent comprising methanol or acetic acid;
- starting a flow of nitrogen;
- adding a catalyst to the first solution to produce a polymer solution;
- starting a flow of hydrogen;
- filtering the polymer solution through a filtration agent to produce a filtrate;
- and
- adding the filtrate to water and stirring to precipitate the polyarylate.
6 more elements
A method for synthesizing a polyarylate having the formula:
- the method comprising:
- dissolving a second polyarylate having the formula:
- with DMF in a flask to produce a first solution;
- starting a flow of nitrogen;
- adding a catalyst to the first solution to produce a polymer solution;
- adding insoluble high surface area particles to the polymer solution produced by adding the catalyst to the first solution;
- starting a flow of hydrogen;
- filtering the polymer solution through a filtration agent to produce a filtrate;
- and
- adding the filtrate to water and stirring to precipitate the polyarylate.
7 more elements
Dependencies are inferred from the claim text.