US5152229A — Zinc sulfide or selenosulfide material

Claim 1

Independent Claim 72 words

A pigment which comprises a cadmium lead and mercury free material comprising crystalline zinc selenide or selenosulphide wherein at least an effective amount below 40% of whose zinc atoms and optionally some of whose selenium and sulphur atoms are substituted to lower the band gap energy but retain the essential crystal lattice of the zinc selenide or selenosulphide, the resulting lattice containing a greater percentage of zinc atoms than of sulphur atoms.

Claim 2

Dependent Claim 72 words

A pigment which comprises a cadmium lead and mercury free material comprising crystalline zinc selenide or selenosulphide wherein at least an effective amount below 40% of whose zinc atoms and optionally some of whose selenium and sulphur atoms are substituted to lower the band gap energy but retain the essential crystal lattice of the zinc selenide or selenosulphide, the resulting lattice containing a greater percentage of zinc atoms than of sulphur atoms.

Claim 3

Dependent Claim 72 words

A pigment which comprises a cadmium-, lead- and mercury-free material comprising crystalline zinc selenide or selenosulphide wherein at least an effective amount below 20% of whose zinc atoms and optionally some of whose selenium and sulphur atoms are substituted to lower the band gap energy but retain the essential crystal lattice of the zinc selenide or selenosulphide, the resulting lattice containing at least one third as many selenium atoms as sulphur atoms.

Claim 4

Dependent Claim 72 words

A pigment which comprises a cadmium-, lead- and mercury-free material comprising crystalline zinc selenide or selenosulphide wherein at least an effective amount below 20% of whose zinc atoms and optionally some of whose selenium and sulphur atoms are substituted to lower the band gap energy but retain the essential crystal lattice of the zinc selenide or selenosulphide, the resulting lattice containing at least one third as many selenium atoms as sulphur atoms.

Claim 5

Dependent Claim 72 words

A pigment which comprises a cadmium-, lead and mercury free material comprising crystalline zinc selenide or selenosulphide wherein at least an effective amount below one third of whose zinc atoms and optionally some of whose selenium and sulphur atoms are substituted to lower the band gap energy but retain the essential crystal lattice of the zinc selenide or selenosulphide, the resulting lattice containing at least as many selenium atoms as sulphur atoms.

Claim 6

Dependent Claim 72 words

A pigment which comprises a cadmium-, lead and mercury free material comprising crystalline zinc selenide or selenosulphide wherein at least an effective amount below one third of whose zinc atoms and optionally some of whose selenium and sulphur atoms are substituted to lower the band gap energy but retain the essential crystal lattice of the zinc selenide or selenosulphide, the resulting lattice containing at least as many selenium atoms as sulphur atoms.

Claim 7

Dependent Claim 16 words

A pigment according to claim 1 wherein at least 0.1% of the zinc atoms are substituted.

Claim 8

Dependent Claim 18 words

A pigment according to claim 1 wherein less than 50% of the selenium and sulphur atoms are substituted.

Claim 9

Dependent Claim 74 words

A pigment according to claim 1 wherein: (1) the zinc atoms which are substituted are substituted by atoms selected from (a) Cu, Ag and Li atoms and (b) In, Fe and Ga atoms in the proportion of 0.1-10 atoms of (b) per atom of (a); and, (2) the selenium and sulphur atoms which are substituted are substituted by O atoms in the proportion of up to 100 atoms of O per atom of (a).

Claim 10

Dependent Claim 30 words

A pigment according to claim 6 wherein the proportion of (b) to (a) is 0.1-1.5 atoms of (b) per atom of (a), and selenium and sulphur atoms are not substituted.

Claim 11

Dependent Claim 12 words

A pigment according to claim 1 wherein the material contains an extender.

Claim 12

Dependent Claim 24 words

A pigment according to claim 1 wherein the hue angle of the material on the CIElab colour co-ordinates system is from 85° to 5°.

Claim 13

Dependent Claim 25 words

A pigment according to claim 1 wherein the number average maximum particle size of the material as measured by scanning electron microscopy is 0.01-5 micron.

Claim 14

Dependent Claim 65 words

A cadmium, lead- and mercury-free material comprising crystalline zinc selenide or selenosulphide at least 0.1% but below 40% of whose zinc atoms and optionally some of whose selenium and sulphur atoms are substituted to lower the band gap energy but retain the essential crystal lattice of the zinc selenide or selenosulphide, the resulting lattice containing a greater percentage of zinc atoms than of sulphur atoms.

Claim 15

Dependent Claim 65 words

A cadmium, lead- and mercury-free material comprising crystalline zinc selenide or selenosulphide at least 0.1% but below 40% of whose zinc atoms and optionally some of whose selenium and sulphur atoms are substituted to lower the band gap energy but retain the essential crystal lattice of the zinc selenide or selenosulphide, the resulting lattice containing a greater percentage of zinc atoms than of sulphur atoms.

Claim 16

Dependent Claim 26 words

A process for preparing a material claimed in claim 11 which process comprises forming a solid solution of the substituent moieties in zinc selenide or selenosulphide.

Claim 17

Dependent Claim 13 words

A substance coloured by containing dispersed therein a pigment claimed in claim 1.

Claim 18

Dependent Claim 14 words

A pigment according to claim 7, wherein (a) is Cu and (b) is In.

Claim 19

Dependent Claim 22 words

A pigment according to claim 1, wherein the dopant by which the crystalline zinc selenide or selenosulphide is substituted is gallium sulphide.

Claim 20

Dependent Claim 24 words

A pigment according to claim 6, wherein the hue angle of the material on the CIElab color co-ordinates system is from 85° to 5°.

Claim 21

Dependent Claim 25 words

A pigment according to claim 6, wherein the number average maximum particle size of the material as measured by scanning electron microscopy is 0.01-5 micron.

Claim 22

Dependent Claim 73 words

A material according to claim 14, wherein: (1) the zinc atoms which are substituted are substituted by atoms selected from (a) Cu, Ag and Li atoms and (b) In, Fe and Ga atoms in the proportion of 0.1-10 atoms of (b) per atom of (a); and (2) the selenium and sulphur atoms which are substituted are substituted by O atoms in the proportion of up to 100 atoms of O atoms of (a).

Claim 23

Dependent Claim 74 words

A substance according to claim 13, wherein: (1) the zinc atoms which are substituted are substituted by atoms selected from (a) Cu, Ag and Li atoms and (B) In, Fe and Ga atoms in the proportion of 0.1-10 atoms of (b) per atom of (a); and (2) the selenium and sulphur atoms which are substituted are substituted by O atoms in the proportion of up to 100 atoms of O per atom of (a).

Claim 24

Dependent Claim 11 words

A substance according to claim 13, which is a plastic article.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1995-10-06	1996-04-06	1996-10-06	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1999-10-06	2000-04-06	2000-10-06	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2003-10-06	2004-04-06	2004-10-06	$7700.00	Window Closed / Lapsed

Zinc sulfide or selenosulfide material

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