Patent US2741917A successfully refreshed from Google Patents.
US4007209A
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Acetals which act as photoinitiators
Assignee: BASF SE
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Filing: 1975-03-10
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Granted: 1977-02-08
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Expires: 1995-03-10
Abstract
Abstract The invention relates to special acetals of benzoin compounds which act as photoinitiators, and to a technically simple manufacturing process involving the reaction of an appropriate α- or β-hydroxyketone with an α,β-olefinically unsaturated ether in the presence of an acid catalyst. The acetals are particularly suitable for use as photoinitiators in the preparation of photopolymer printing plates.
Inventors
- 👤 Eckhard Hickmann
- 👤 Martin Fischer
- 👤 Otto Volkert
- 👤 Mong-Jon Jun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:03
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/76; C07C49/84; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/70; C07C45/71; G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/028; G03F7/031
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
Acetals of benzoin compounds which act as photoinitiators and which have the formula ##STR10## which contain at least one acetal group ##STR11## in the radicals R 3 or R 4 , Y being CH 3 and Z being C 2 -C 4 -alkyl, or Y and Z together forming a propylene or butylene group; R 1 and R 2 are H, C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy or Cl, R 3 is H, CH 3 , CH 2 OR 5 or CH 2 X, R 4 is X or OR 5 and R 5 is C 1 -C 6 -alkyl.
Claim 2
Dependent Claim
104 words
Acetals of benzoin compounds which act as photoinitiators and which have the formula ##STR10## which contain at least one acetal group ##STR11## in the radicals R 3 or R 4 , Y being CH 3 and Z being C 2 -C 4 -alkyl, or Y and Z together forming a propylene or butylene group; R 1 and R 2 are H, C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy or Cl, R 3 is H, CH 3 , CH 2 OR 5 or CH 2 X, R 4 is X or OR 5 and R 5 is C 1 -C 6 -alkyl.
Claim 3
Dependent Claim
29 words
An acetal as set forth in claim 1 wherein R 3 is H, R 4 is X, and Z and Y are joined to form a tetrahydropyranyl ether ring.
Claim 4
Dependent Claim
14 words
A compound as set forth in claim 1 wherein said acetal is benzointetrahydropyranyl ether.
Claim 5
Dependent Claim
14 words
A compound as set forth in claim 1 wherein said acetal is α-methyl-benzointetrahydropyranyl ether.
Claim 6
Dependent Claim
15 words
A compound as set forth in claim 1 wherein said acetal is benzoin 2-methoxy-tetrahydropyranyl ether.
References Cited (Backward Citations)
US2541747A
Cited
GB1265604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |