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AssigneeSabic Global Technologies B.V.
InventorsAmanda Marie Flores, Jacob LaBelle, Peter James Zuber, Kim R. Choate
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Disclosed herein are polycarbonate fibers and fibrous substrates, such as papers, containing such fibers. The polycarbonate fibers are produced from a polymeric composition comprising a cross-linkable polycarbonate containing endgroups derived from a monofunctional benzophenone or containing repeating units derived from a difunctional benzophenone. The polycarbonate fibers can be combined with other fibers to form the fibrous substrate. Upon exposure to ultraviolet light, crosslinking of the polycarbonate fibers will occur, improving various properties of the fibrous substrate.
A cross-linkable polycarbonate fiber, formed from a polymeric composition comprising a cross-linkable polycarbonate resin containing a photoactive group derived from a monohydroxybenzophenone, wherein the cross-linkable polycarbonate resin does not contain any residual pyridine, and the cross-linkable polycarbonate resin does not contain any repeating units derived from dihydroxybenzophenones.
A cross-linkable polycarbonate fiber, formed from a polymeric composition comprising a cross-linkable polycarbonate resin containing a photoactive group derived from a dihydroxybenzophenone and endcap groups derived from an end-capping agent selected from the group consisting of phenol, p-t-butylphenol, p-cumylphenol, octylphenol, and p-cyanophenol, wherein the cross-linkable polycarbonate resin does not contain any residual pyridine, and the polymeric composition further comprises a polymeric base resin, wherein the weight ratio of the cross-linkable polycarbonate resin to the polymeric base resin is from about 50:50 to about 95:5, wherein a fibrous substrate comprising the cross-linkable polycarbonate fiber has improved dimensional stability after UV exposure, as measured by an absolute improvement in the average % loss of fiber strength of 95% or more compared to before the UV exposure at 160° C.
Dependencies are inferred from the claim text.