Styryl-tetrahydronaphthyl derivatives
AssigneeHickson & Welch Limited
InventorsHugh Davidson, Keith Trevor Johnson, Brian Ernest Leggeter, Anthony John Moore
Life of this patent
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Abstract
Compounds of the general formula R--CH.dbd.CH--W--CH.dbd.CH--R.sup.1 are described in which R and R.sup.1 are independently phenyl, diphenyl, naphthyl, indyl, tetrahydronaphthyl or acenaphthenyl and W is divalent phenyl, diphenyl, naphthyl, tetrahydronaphthyl or acenaphthenyl group, which groups may be substituted, the compounds containing at least one non-aromatic ring. Such compounds are useful as optical whitening agents, for example in textile material or paper.
Claims2
A compound of the formula ##STR38## wherein R is --SO.sub.3 H, halo or alkoxy of 1-6 carbon atoms and n is 0, 1 or 2, at least one --SO.sub.3 H group being present;
- or a salt thereof.
Dependencies are inferred from the claim text.