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AssigneeImperial Chemical Industries PLC
InventorsDerrick S. Bailey, Frederic N. Cogswell, Brian P. Griffin
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Shaped articles are provided containing a polymer which is capable of exhibiting anisotropy in the melt characterized in that the ratio of the stiffness in any two directions at right angles in the shaped article differs by at least 10%, and preferably by at least 50%, from the ratio in the same two directions for a control sample made from a melt consisting entirely of the polymer in anisotropic form. These may be obtained by a variety of methods including disturbing the normal flow pattern of flow into a mould by including obstacles to flow in the mould, disturbing the pattern of flow by foaming in the mould, by including fillers or by using polymers capable of existing as a bi-phase anisotropic and isotropic melt and forming shaped articles in which the two-phase disposition is retained.
A shaped article containing a polymer which is capable of exhibiting anisotropy in the melt characterised in that the ratio of the stiffness in any two directions at right angles in the shaped article differs by at least 10%, and preferably by at least 50%, from the ratio in the same two directions for a control sample made from a melt consisting entirely of the polymer in anisotropic form.
A process of forming a shaped article from a polymer which is capable of exhibiting anisotropy in the melt comprising obtaining a melt of the polymer in a temperature range over which the polymer exhibits a two-phase melt of the polymer molecules in both isotropic and anisotropic form and below the decomposition temperature of the polymer, preparing a shaped article from such a melt and quenching the melt.
A process of forming a shaped article from a polymer capable of exhibiting anisotropy in the melt comprising obtaining an anisotropic melt of the polymer and causing it to flow into a mould which contains an obstacle to flow constrained within the mould whereby the obstacle provides a resistance to the flow of melt.
A process for forming a shaped article from a polymer capable of exhibiting anisotropy in the melt comprising obtaining an anisotropic melt of the polymer, causing the melt to foam, forming a shaped article from the foamed melt and quenching the foamed melt.
Dependencies are inferred from the claim text.