Photoactive polyimides, polyamide acids or esters with side chain photocrosslinkable groups
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United States of America Patent
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Dec 14, 2004
Grant Date -
Feb 27, 2003
app pub date -
Jul 16, 2002
filing date -
Jan 24, 2000
priority date (Note) -
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Abstract
A photoactive polymer from the class of polyimides, polyamide acids and esters thereof comprises as a side-chain a photocrosslinkable group of the general formula (I) ##STR1## wherein the broken line indicates the point of linkage to the polyimide main chain and wherein: B is a straight-chain or branched alkyl residue which is optionally substituted, wherein one or more non-adjacent CH.sub.2 groups may independently be replaced by a group Q; D represents an oxygen atom or --NR.sup.1 -- wherein R.sup.1 represents a hydrogen atom or lower alkyl; and S.sup.3 represents a spacer unit. The polymers may be used as orientation layers for liquid crystals and in the construction of unstructured and structured optical elements and multi-layer systems.
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