SHAPE MEMORY POLYMERS

• US 20200131299A1
• Filed: 12/23/2019
• Published: 04/30/2020
• Est. Priority Date: 08/16/2004
• Status: Active Grant

• Current Assignee: Lawrence Livermore National Security LLC (Government of the United States of America)
• Original Assignee: Lawrence Livermore National Security LLC (Government of the United States of America)
• Inventors: Wilson, Thomas S., Bearinger, Jane P.
• Granted Patent: US 11,453,740 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 17/3498 Valves therefor, e.g. flapper valves, slide valves haemostasis valves A61M39/06; check valves A61M39/24
• CPC Class Codes: A61B 2017/00867 shape memory effect for prostheses A61F2210/0014
• CPC Class Codes: A61B 2017/00871 polymeric
• CPC Class Codes: A61B 2017/2932 Transmission of forces to jaw members
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C08G 18/08 Processes
• CPC Class Codes: C08G 18/3203 Polyhydroxy compounds
• CPC Class Codes: C08G 18/3221 hydroxylated esters of carboxylic acids other than higher fatty acids
• CPC Class Codes: C08G 18/3271 Hydroxyamines
• CPC Class Codes: C08G 18/3281 containing three hydroxy groups
• CPC Class Codes: C08G 18/3284 containing four hydroxy groups
• CPC Class Codes: C08G 18/3287 containing cycloaliphatic groups
• CPC Class Codes: C08G 18/3851 containing three nitrogen atoms in the ring
• CPC Class Codes: C08G 18/73 acyclic
• CPC Class Codes: C08G 2280/00 Compositions for creating shape memory
• CPC Class Codes: C08J 9/0085 Use of fibrous compounding ingredients C08J9/0076 takes precedence
• CPC Class Codes: C08L 75/04 Polyurethanes
• CPC Class Codes: C08L 75/12 from compounds containing nitrogen and active hydrogen, the nitrogen atom not being part of an isocyanate group
• CPC Class Codes: C08L 75/14 Polyurethanes having carbon-to-carbon unsaturated bonds

Abstract

New shape memory polymer compositions, methods for synthesizing new shape memory polymers, and apparatus comprising an actuator and a shape memory polymer wherein the shape memory polymer comprises at least a portion of the actuator. A shape memory polymer comprising a polymer composition which physically forms a network structure wherein the polymer composition has shape-memory behavior and can be formed into a permanent primary shape, re-formed into a stable secondary shape, and controllably actuated to recover the permanent primary shape. Polymers have optimal aliphatic network structures due to minimization of dangling chains by using monomers that are symmetrical and that have matching amine and hydroxl groups providing polymers and polymer foams with clarity, tight (narrow temperature range) single transitions, and high shape recovery and recovery force that are especially useful for implanting in the human body.

Claims

1. A shape memory polymer composition comprising:

a plurality of units, each comprising three or more branches;

wherein (a) at least one of the branches of one of the plurality of units comprise an ester, and (b) at least some of the plurality of units are crosslinked to others of the plurality of units through linkages comprising urethane.