Patent JPS631676A successfully refreshed from Google Patents.
Patent US4118233A successfully refreshed from Google Patents.
US4118233A
Expired / Lapsed
US
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Photosensitive composition for printing screens
Assignee: Murakami Screen KK
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Filing: 1976-10-04
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Granted: 1978-10-03
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Expires: 1996-10-04
Abstract
Abstract A photosensitive composition in solution for printing screens which comprises:
Inventors
- 👤 Takahiro Tsunoda
- 👤 Tsuguo Yamaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:46
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
156 words
A photosensitive composition in solution for printing screens comprising: (a) a liquid medium selected from the group consisting of water-miscible organic solvents and solvent mixtures of said organic solvents and water; (b) a polymer soluble in both said organic solvents and water selected from the group consisting of partially saponified polyvinyl acetate and partially saponified copolymers of vinyl acetate and crotonic acid; (c) a sensitizer soluble in said organic solvents selected from the group consisting of pentaerythritol triacrylate and pentaerythritol tetraacrylate and their prepolymers having an average degree of polymerization of not greater than 5; and (d) an initiator soluble in said organic solvents and capable of generating a radical upon exposure to light, wherein said liquid medium is present in the range of 150 to 800 parts by weight and the sensitizer is present in the range of 20 to 400 parts by weight, respectively, with respect to 100 parts by weight of the polymer.
Claim 2
Dependent Claim
156 words
A photosensitive composition in solution for printing screens comprising: (a) a liquid medium selected from the group consisting of water-miscible organic solvents and solvent mixtures of said organic solvents and water; (b) a polymer soluble in both said organic solvents and water selected from the group consisting of partially saponified polyvinyl acetate and partially saponified copolymers of vinyl acetate and crotonic acid; (c) a sensitizer soluble in said organic solvents selected from the group consisting of pentaerythritol triacrylate and pentaerythritol tetraacrylate and their prepolymers having an average degree of polymerization of not greater than 5; and (d) an initiator soluble in said organic solvents and capable of generating a radical upon exposure to light, wherein said liquid medium is present in the range of 150 to 800 parts by weight and the sensitizer is present in the range of 20 to 400 parts by weight, respectively, with respect to 100 parts by weight of the polymer.
Claim 3
Dependent Claim
23 words
The composition of claim 1, wherein the polymer (b) is partially saponified polyvinyl acetate having a degree of saponification of 40 to 85%.
Claim 4
Dependent Claim
20 words
The composition of claim 1, wherein the polymer (b) is a partially saponified copolymer of vinyl acetate and crotonic acid.
Claim 5
Dependent Claim
12 words
The composition of claim 1, wherein the sensitizer (c) is pentaerythritol triacrylate.
Claim 6
Dependent Claim
12 words
The composition of claim 1, wherein the sensitizer (c) is pentaerythritol tetraacrylate.
Claim 7
Dependent Claim
50 words
The composition according to claim 1 wherein the liquid medium is present in the quantity range of 250 to 650 parts by weight and the sensitizer is present in the quantity range of 50 to 200 parts by weight, respectively, with respect to 100 parts by weight of the polymer.
Claim 8
Dependent Claim
43 words
The composition according to claim 1 wherein said organic solvent is selected from the group consisting of alcohols having from 1 to 4 carbon atoms, methyl cellosolve, ethyl cellosolve, butyl cellosolve, acetone, methyl ethyl ketone, methyl isobutyl ketone, dioxane, dimethylformamide, and dimethyl sulfoxide.
Claim 9
Dependent Claim
40 words
The composition according to claim 1 wherein said initiator is selected from the group consisting of benzoin alkyl ethers having from 1 to 4 carbon atoms in the alkyl group, Michler's ketone, di-t-butyl peroxide, dibenzothiazolyl disulfide, tri-bromoacetophenone, and t-butyl anthraquinone.
Claim 10
Dependent Claim
31 words
The composition according to claim 1 wherein said initiator is present in a quantity of 1 to 20 parts by weight with respect to 100 parts by weight of the sensitizer.
Claim 11
Dependent Claim
30 words
The composition according to claim 1 further comprising an antioxidant in a quantity of 0.01 to 5 parts by weight with respect to 100 parts by weight of the polymer.
Claim 12
Dependent Claim
24 words
The composition according to claim 10 wherein said antioxidant is selected from the group consisting of hydroquinone, p-methoxyphenone, stannous chloride, zinc chloride, and waxes.
Claim 13
Dependent Claim
29 words
The composition according to claim 1 further comprising shellac in a quantity of 10 to 100 parts by weight with respect to 100 parts by weight of the polymer.
References Cited (Backward Citations)
US2902365A
Cited
US3070442A
Cited
US3100150A
Cited
US3278304A
Cited
US3279919A
Cited
US3630746A
Cited
US3677755A
Cited
US3801328A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-02 | 1982-04-03 | 1982-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-02 | 1986-04-03 | 1986-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-02 | 1990-04-03 | 1990-10-03 | $7700.00 | Window Closed / Lapsed |