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US 2006/0223955 A1Published application
Modification of thermoplastic polymers
AssigneeMedtronic, Inc.
InventorsDeon Bezuidenhout, Jacobus Theron, Lawrence Higham, Peter Zilla
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Abstract
A method of preparing a polymer involving reacting at least one backbone carbamate (and/or optional urea) nitrogen of a thermoplastic polymer with a modification agent to form a modified polymer.
Claims31
A method of preparing a polymer, the method comprising:
- providing a thermoplastic polymer comprising urethane groups having backbone carbamate nitrogen atoms, and optionally urea groups having backbone urea nitrogen atoms;
- and
- reacting at least one backbone carbamate nitrogen atom and/or optional backbone urea nitrogen atom of the thermoplastic polymer with a modification agent to form a modified polymer;
- wherein the modification agent has a formula X—R—(Y)a,
- wherein:
- X comprises an electrophilic center reactive with the backbone carbamate nitrogen and/or optional urea nitrogen on the thermoplastic polymer;
- R is a bond or an organic group;
- each Y is independently a crosslinkable group;
- and
- a is 1 to 3.
7 more elements
A method of preparing a polymer, the method comprising:
- providing a thermoplastic polymer comprising urethane groups having backbone carbamate nitrogen atoms, and optionally urea groups having backbone urea nitrogen atoms;
- reacting no greater than 20% of the backbone carbamate nitrogen atoms and/or the optional backbone urea nitrogen atoms of the thermoplastic polymer with a modification agent to form a modified polymer;
- wherein the modification agent has a formula X—R—(Y)a,
- wherein:
- X comprises a carboxylic acid, activated carboxylic acid, acid halide, anhydride, ester, amide, isocyanate, sulfonic ester, succinimidyl ester, 2,3,5,6-tetrafluorobenzoyl, acyl azide, acyl nitrile group, or combinations thereof;
- R is a bond or a linear or branched hydrocarbon group, ester group, amide group, ether group, amine group, or combinations thereof;
- each Y independently a vinyl, substituted vinyl, silane, or substituted silane group;
- and
- a is 1 to 3;
- and
- activating the modified polymer to form a crosslinked polymer.
8 more elements
Dependencies are inferred from the claim text.