EP0042704A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of forming a pattern employing a photosensitive composition
Assignee: Hitachi Ltd
•
Filing: 1981-06-12
•
Granted: —
•
Expires: 2001-06-12
Abstract
Abstract photosensitive composition for use in forming color picture tubes contains an aromatic diazonium compound of the general formula: where R 1 and R 2 are straight chain alkyl radicals, R 3 and R 4 are each one of H, CH 3 or OCH 3 except that R 3 and R 4 cannot both be H, and A is CL½ZnCl 2 , BF 4 or HSO 4 . The sensitivity of the composition is approximately 10 - 20% higher than that of conventional compositions.
Inventors
- 👤 Hajime Morishita
- 👤 Takahiro Kohashi
- 👤 Nobuaki Hayashi
- 👤 Motoo Akagi
- 👤 Shoichi Uchino
- 👤 Saburo Nonogaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 09:04
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/54; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/22; H01J29/225; C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0079; G03F; G03F7/00; G03F7/26; G03F7/28
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
78 words
A photosensitive composition containing an aromatic diazonium compound characterised in that said compound is of the general formula: where R1 and R2 are straight chain alkyl radicals, R3 and R 4 are each one of H, CH 3 or OCH 3 except that R 3 and R 4 cannot both be H, and A is a moiety selected so that the compound has sufficient crystallinity for use as a photosensitive composition and becomes tacky when exposed to light.
Claim 2
Dependent Claim
78 words
A photosensitive composition containing an aromatic diazonium compound characterised in that said compound is of the general formula: where R1 and R2 are straight chain alkyl radicals, R3 and R 4 are each one of H, CH 3 or OCH 3 except that R 3 and R 4 cannot both be H, and A is a moiety selected so that the compound has sufficient crystallinity for use as a photosensitive composition and becomes tacky when exposed to light.
Claim 3
Dependent Claim
18 words
A photosensitive composition according to claim 1 in which A is Cl.½ZnCl 2 , BF 4 or HS04.
Claim 4
Dependent Claim
18 words
A photosensitive composition according to claim 1 or claim 2, wherein R 1 and R2 are both methyl.
Claim 5
Dependent Claim
16 words
A photosensitive composition according to claim 2 or claim 3 wherein A is Cl.½ZnCl 2 .
Claim 6
Dependent Claim
21 words
A photosensitive composition according to claim 1, wherein said aromatic diazonium compound is 2-methyl-4-(dimethylamino) benzene diazonium chloride zinc chloride double salt.
Claim 7
Dependent Claim
21 words
A photosensitive composition according to claim 1, wherein said aromatic diazonium compound is 3-methoxy-4-(dimethylamino) benzene diazonium chloride zinc chloride double salt.
Claim 8
Dependent Claim
22 words
A photosensitive composition according to claim 1, wherein said aromatic diazonium compound is 2, 5-dimethyl-4-(dimethylamino) benzene diazonium chloride zinc chloride double salt.
Claim 9
Dependent Claim
22 words
A photosensitive composition according to claim 1, wherein said aromatic diazonium compound is 2, 6-dimethyl-4-(dimethylamino) benzene diazonium chloride zinc chloride double salt.
Claim 10
Dependent Claim
56 words
A photosensitive composition according to any one of claims 1 to 8, further containing another aromatic diazonium compound in a weight ratio in the range 9 : 1 to 1 : 2 with resepect to said aromatic diazonium compound of the said formula, the said other compound being one which becomes tacky when exposed to light.
Claim 11
Dependent Claim
22 words
A photosensitive composition according to claim 9, wherein said other aromatic diazonium compound is 4-(dimethylamino) benzene diazonium chloride zinc chloride double salt.
Claim 12
Dependent Claim
37 words
A photosensitive composition according to any one of claims 1 to 8, further containing an organic polymer compound in a range of 0.5 to 500 weight-% with respect to the total quantity of said aromatic diazonium compound.
Claim 13
Dependent Claim
43 words
A photosensitive composition according to claim 11, wherein said organic polymer compound is at least one of gum arabic, polyvinyl alcohol, polacrylamide, poly-N-vinyl pyrrolidone, hydroxypropyl methyl cellulose, alginic acid, propylene glycol ester of alginic acid, acrylamide-diacetoneacrylamide copolymer, and methyl vinyl ether-maleic anhydride copolymer.
Claim 14
Independent Claim
87 words
A method of forming a pattern of a powder coating layer on a faceplate of a color picture tube by applying a thin film of a photosensitive composition on the inner surface of the faceplate, exposing said thin layer to light in a desired pattern to cause the exposed parts to become tacky,and bringing powder particles into contact with the exposed parts of the thin layer so that the powder adheres thereto, wherein said photosensitive composition is a composition according to any one of the preceding claims.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.