Low hygroscopic paper and method of producing the same
AssigneeSumitomo Chemical Company, Limited
InventorsHiroaki Kumada, Takanari Yamaguchi
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Abstract
Provided is low hygroscopic paper obtainable by heat-pressing composite paper comprising a pulp component and/or fiber component and, a liquid crystal polymer filler component made of a liquid crystal polymer exhibiting optical anisotropy in molten state, at a temperature higher than the flow initiation temperature of said liquid crystal polymer by 30 ° C. or more. The low hygroscopic paper has also excellent machanical strength and heat resistance, and can be used as a substrate paper such as a prepreg particularly useful for electric and electronic circuit boards.
Claims15
Low hygroscopic paper obtained by heat-pressing composite paper which comprises a pulp component and/or fiber component and, a liquid crystal polymer filler component made of a liquid crystal polymer exhibiting optical anisotropy in molten state, at a temperature higher than the flow initiation temperature of said liquid crystal polymer by 30° C. or more.
The low hygroscopic paper according to claim 1, wherein the composite paper is made from a paper material comprising a pulp component and/or fiber component and, a liquid crystal polymer filler component made of a liquid crystal polymer exhibiting optical anisotropy in molten state.
The low hygroscopic paper according to claim 1, wherein the liquid crystal polymer filler is contained in an amount of 1% by weight or more and less than 6.0% by weight based on the total amount of the liquid crystal polymer filler and the pulp component and/or fiber component.
The low hygroscopic paper according to claim 1, wherein the liquid crystal polymer filler has a trunk part in the form of flat plate and a specific surface area of from 0.01 to 2.5 m2/g.
The low hygroscopic paper according to claim 1, wherein the liquid crystal polymer filler is obtained by pulverizing a film-shaped form made of a liquid crystal polymer exhibiting optical anisotropy in molten state.
The low hygroscopic paper according to claim 1, wherein the liquid crystal polymer exhibiting optical anisotropy in molten state is a liquid crystal polyester.
The low hygroscopic paper according to claim 1, wherein the liquid crystal polymer exhibiting optical anisotropy in molten state is a liquid crystal polyester resin composition comprising a liquid crystal polyester (A) as a continuous phase and a copolymer (B) containing a functional group reactive with liquid crystal polyester as a dispersed phase.
The low hygroscopic paper according to claim 1, wherein the pulp and/or fiber component comprises at least one selected from aromatic polyamide, nylon, aromatic polyimide, aromatic polyamideimide and cellulose.
A method of producing low hygroscopic paper in which a composite paper comprising a pulp component and/or fiber component and, a liquid crystal polymer filler component made of a liquid crystal polymer exhibiting optical anisotropy in molten state is heat-pressed at a temperature higher than the flow initiation temperature of said liquid crystal polymer by 30° C. or more.
A method of reducing the moisture absorption rate of paper in which a composite paper comprising a pulp component and/or fiber component and, a liquid crystal polymer filler component made of a liquid crystal polymer exhibiting optical anisotropy in molten state is heat-pressed at a temperature higher than the flow initiation temperature of said liquid crystal polymer by 30° C. or more.
A branched liquid crystal polymer filler comprising a liquid crystal polymer exhibiting optical anisotropy in molten state and having a trunk part in flattened form and branching parts extending from the trunk part.
Dependencies are inferred from the claim text.