US4418138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photopolymerizable materials for use in producing stencils for screen printing
Assignee: Sericol Ltd
•
Filing: 1982-08-25
•
Granted: 1983-11-29
•
Expires: 2002-08-25
Abstract
Abstract Aqueous compositions useful in making stencils for screen printing comprise one or more unsaturated monomers, a tertiary amino compound, a colloid, and a water-soluble, carboxy- or sulpho-alkyleneoxy-thioxanthone photoinitiator. When coated on to a suitable support sheet and dried, photosensitive sheets are obtained useful for making stencils for screen printing by the direct, indirect, or direct/indirect methods.
Inventors
- 👤 John R. Curtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:44
CPC Classifications
C; C07; C07D; C07D335/00; C07D335/04; C07D335/10; C07D335/12; C07D335/14; C07D335/16; C08; C08F; C08F2/00; C08F2/46; C08F2/48; C08F2/50; G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/028; G03F7/031; G03F7/12; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/114; Y10S430/122; Y10S430/123
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
132 words
An aqueous photopolymerisable composition comprising (1) at least one terminally ethylenically unsaturated monomer, which is dispersible, miscible or soluble in water, (2) at least one tertiary nitrogen-containing compound as accelerator, (3) a water-soluble colloid, and (4) a water-soluble photoinitiator of the formula: ##STR3## where R 1 is halogen, alkyl, alkoxy, alkylthio, nitro, amino, alkylamino, dialkylamino, hydroxyalkylamino, alkanoylamino, benzoylamino, N-alkanoyl-N-benzoylamino, sulphonamido or acetyl, R 2 is alkylene of 1 to 4 carbon atoms, n is 0, 1 or 2, m is 1 or 2, and A is --COOH, --SO 3 H, --OSO 3 H, or --OCO-X-COOH (where X is such that HOOC-X-COOH is a di- or tri-carboxylic acid of up to 8 carbon atoms), the aforesaid alkyl, alkoxy, and alkenyl residues containing up to 4 carbon atoms each, or a water-soluble salt thereof.
Claim 2
Dependent Claim
132 words
An aqueous photopolymerisable composition comprising (1) at least one terminally ethylenically unsaturated monomer, which is dispersible, miscible or soluble in water, (2) at least one tertiary nitrogen-containing compound as accelerator, (3) a water-soluble colloid, and (4) a water-soluble photoinitiator of the formula: ##STR3## where R 1 is halogen, alkyl, alkoxy, alkylthio, nitro, amino, alkylamino, dialkylamino, hydroxyalkylamino, alkanoylamino, benzoylamino, N-alkanoyl-N-benzoylamino, sulphonamido or acetyl, R 2 is alkylene of 1 to 4 carbon atoms, n is 0, 1 or 2, m is 1 or 2, and A is --COOH, --SO 3 H, --OSO 3 H, or --OCO-X-COOH (where X is such that HOOC-X-COOH is a di- or tri-carboxylic acid of up to 8 carbon atoms), the aforesaid alkyl, alkoxy, and alkenyl residues containing up to 4 carbon atoms each, or a water-soluble salt thereof.
Claim 3
Dependent Claim
31 words
A composition according to claim 1 wherein the monomer (1) comprises at least one terminally ethylenically mono-unsaturated monomer, and at least one terminally ethylenically di- or tri-unsaturated monomer as cross-linking agent.
Claim 4
Dependent Claim
22 words
A composition according to claim 2, wherein the mono-unsaturated monomer is selected from the class consisting of acrylamide, N-methylolacrylamide, methacrylamide and N-vinyl-pyrrolidone.
Claim 5
Dependent Claim
40 words
A composition according to claim 2, wherein the di- or tri-unsaturated monomer is selected from the class consisting of polyethylene glycol (200) diacrylate, triethylene glycol diacrylate, tripropylene glycol diacrylate, tetraethylene glycol diacrylate, N,N'-methylene-bis-acrylamide, N,N'-trimethylene-bis-acrylamide, N,N'-hexamethylene-bis-acrylamide, trimethylol-propane triacrylate, and pentaerythritol triacrylate.
Claim 6
Dependent Claim
28 words
A composition according to claim 1, wherein the said accelerator (2) is selected from the class consisting of triethanolamine, methyl-diethanolamine, ethyl-diethanolamine, N-N-dimethylamino-ethyl acrylate, N,N-diethylaminoethyl acrylate and Uvecryl P101.
Claim 7
Dependent Claim
25 words
A composition according to claim 1, wherein the said colloid (3) is selected from the class consisting of polyvinyl alcohol, polyvinylpyrrolidone, gelatin, hydroxyethyl-cellulose, and hydroxypropylcellulose.
Claim 8
Dependent Claim
31 words
A composition according to claim 1, wherein the said photoinitiator (4) is selected from the class consisting of 2-(carboxymethoxy)-thioxanthone, 2-(3-carboxypropoxy)-thioxanthone, 2-(3-sulphopropoxy)-thioxanthone, 2-(2-sulphoethoxyethoxy)-thioxanthone, 2-(3-sulphopropoxy)-3,4-dimethylthioxanthone, as the free acids and their water-soluble salts.
Claim 9
Dependent Claim
31 words
A composition according to claim 1, which also contains a cationic surfactant selected from the class consisting of polyoxyethylene and polyoxypropylene compounds containing at least one tertiary nitrogen atom per molecule.
Claim 10
Dependent Claim
13 words
A composition according to claim 1, which also contains an inert polymer emulsion.
Claim 11
Dependent Claim
15 words
A composition according to claim 1, which also contains a colouring agent and/or a filler.
Claim 12
Dependent Claim
17 words
A composition according to claim 1, which also contains a thioindigoid or indigoid dyestuff as colouring agent.
Claim 13
Dependent Claim
60 words
A composition according to claim 1, comprising, by weight of the said composition, 40 to 80% of water, 4 to 30% of the terminally ethylenically unsaturated monomer (1), 0.7 to 6% of the tertiary nitrogen-containing compound (2), 4 to 14% of the colloid (3), 0 to 5% of a cationic surfactant, and 0.1 to 5% of the said photoinitiator (4).
Claim 14
Dependent Claim
100 words
A composition according to claim 12 comprising, by weight of the said composition, 50 to 70% of water, 3 to 8% of monofunctional terminally ethylenically unsaturated monomer (1), 0.5 to 9% of di-functional terminally ethylenically unsaturated monomer (1), 0 to 2% of trifunctional terminally ethylenically unsaturated monomer (1), 1 to 4% of tertiary nitrogen-containing compound (2), 6 to 10% of colloid (3), 5 to 15% (based on solids content) of a polymer emulsion, 0 to 3% of a cationic surfactant, 5 to 12% of a filler, 0 to 3% of a plasticizer, and 0.12 to 1.8% of the photoinitiator (4).
Claim 15
Dependent Claim
13 words
A support sheet coated with a composition according to claim 1 and dried.
Claim 16
Dependent Claim
15 words
A screen for screen printing coated with a composition according to claim 1 and dried.
Claim 17
Dependent Claim
15 words
A transparent flexible support sheet coated with a composition according to claim 1 and dried.
Claim 18
Dependent Claim
35 words
A method of producing a stencil for screen printing which comprises irradiating a coated sheet as claimed in claim 16 with actinic light, developing the irradiated sheet and transferring the insolubilised image to a screen.
Claim 19
Dependent Claim
29 words
A method of producing a stencil for screen printing which comprises irradiating a coated screen as claimed in claim 15 with actinic light, and then developing the insolubilised image.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |