Liquid crystal polymers
AssigneeRensselaer Polytechnic Institute
InventorsBrian Benicewicz, Jiping Shao
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Abstract
Liquid crystal polyester derived from phenylene-naphthalene monomers and one or more comonomers display an improved balance of properties, including low melt viscosity, fast cycle time in molding, very low mold shrinkage, high tensile and/or flexural strength, solvent resistance, excellent barrier properties, low water absorption, low thermal expansion coefficient, excellent thermostability, and/or low flammability. The phenylene-naphthalene monomers are The one or more comonomers include 4-hydroxybenzoic acid, 2-hydroxy-6-naphthoic acid, terephthalic acid, isophthalic acid, and derivatives and combinations thereof.
Claims18
A liquid crystal polymer comprising at least one repeating unit selected from the group consisting of radicals of formula I, II, and IV:
- and combinations thereof.
An anhydrous liquid crystal polymer comprising at least one repeating unit selected from the group consisting of radicals of formula I, II, and IV:
- prepared by a process comprising thermally polymerizing a phenylene-naphthalene monomer selected from the group consisting of
- and combinations thereof, and, optionally, one or more comonomers.
Dependencies are inferred from the claim text.