Radiation sensitive compositions containing pyrylium compounds

Claim 2

A photoconductive composition comprising an electrically insulating material containing a sensitizing amount of a pyrylium-type salt having the formula: ##STR20## wherein: each of X 1 and X 2 , which may be the same or different, represents oxygen, sulfur, or selenium; each of Y 1 and Y 2 , which may be the same or different, represents the atoms necessary to complete a heterocyclic unsaturated ring nucleus having 6 or 10 ring atoms including a selenium, sulfur or oxygen hetero ring atom and 5 or 9 carbon ring atoms; each of R 1 , R 2 , and R 3 , which may be the same or different, represents hydrogen, halogen, cyano, nitro, alkyl having 1 to about 4 carbon atoms in the alkyl group, or aryl, with the proviso that at least one of R 1 , R 2 , or R 3 represents aryl; and Z.sup.⊖ represents an anionic function.

Claim 3

A photoconductive composition as defined in claim 1 wherein: each of R 1 -R 3 , which may be the same or different, represents hydrogen, alkyl, phenyl or alkoxyphenyl; the heterocyclic ring containing Y 1 represents a group having one of the following structures: ##STR21## and wherein the heterocyclic ring containing Y 2 represents a group having one of the following structures: ##STR22## wherein each of X 1 and X 2 , which may be the same or different, represents oxygen or sulfur; Z represents an anionic function; and each of R 4 , R 5 , R 6 , R 7 , R 8 , and R 9 , which may be the same or different, represents hydrogen, alkyl having 1 to 4 carbon atoms in the alkyl group, phenyl, and when taken together any two R 4 -R 9 groups attached to adjacent carbon ring atoms represent the atoms necessary to complete an aryl ring.

Claim 4

A photoconductive composition as defined in claim 1 wherein said pyrylium-type salt is selected from the group consisting of 4-[3-(2,6-Diphenyl-4H-pyran-4-ylidene)-2-phenylpropen-1-yl]-2,6-diphenylpyrylium perchlorate; 4-[3-(2,6-Diphenyl-4H-pyran-4-ylidene)-2-phenylpropen-1-yl]flavylium perchlorate; 4-[3-(4H-Benzopyran-4-ylidene)-2-phenylpropen-1-yl]flavylium perchlorate; and 4-[3-(2,6-Diphenyl-4H-pyran-4-ylidene)-2-(p-methoxyphenyl)propen-1-yl]-2,6-diphenylpyrylium perchlorate.

Claim 5

A photoconductive composition comprising an electrically insulating material containing an organic photoconductor and a sensitizing amount of pyrylium-type salt having the formula: ##STR23## wherein each of X 1 and X 2 , which may be the same or different, represents oxygen, sulfur, or selenium; each of Y 1 and Y 2 , which may be the same or different, represents the atoms necessary to complete a heterocyclic unsaturated ring nucleus having 6 or 10 ring atoms including a selenium, sulfur or oxygen hetero ring atom and 5 or 9 carbon ring atoms; each of R 1 , R 2 , and R 3 , which may be the same or different, represents hydrogen, halogen, cyano, nitro, alkyl having 1 to about 4 carbon atoms in the alkyl group, or aryl, with the proviso that at least one of R 1 , R 2 , or R 3 represents aryl; and Z.sup.⊖ represents an anionic function.

Claim 6

A photoconductive composition comprising an electrically insulating material containing an organic photoconductor and a sensitizing amount of pyrylium-type salt having the formula: ##STR23## wherein each of X 1 and X 2 , which may be the same or different, represents oxygen, sulfur, or selenium; each of Y 1 and Y 2 , which may be the same or different, represents the atoms necessary to complete a heterocyclic unsaturated ring nucleus having 6 or 10 ring atoms including a selenium, sulfur or oxygen hetero ring atom and 5 or 9 carbon ring atoms; each of R 1 , R 2 , and R 3 , which may be the same or different, represents hydrogen, halogen, cyano, nitro, alkyl having 1 to about 4 carbon atoms in the alkyl group, or aryl, with the proviso that at least one of R 1 , R 2 , or R 3 represents aryl; and Z.sup.⊖ represents an anionic function.