Patent US4279720A successfully refreshed from Google Patents.
US4279720A
Expired / Lapsed
US
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Photocurable composition
Assignee: BASF Corp
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Filing: 1979-07-02
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Granted: 1981-07-21
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Expires: 1999-07-02
Abstract
Abstract The use of photo-initiators of the formula I <IMAGE> in which Ar is a C6-C14-aryl radical which is unsubstituted or mono-, di- or tri-substituted by C1-C4-alkyl, C1-C4-alkoxy, phenoxy, C1-C4-alkylthio, phenylthio or halogen, and R is C1-C12-alkyl, C5-C6-cycloalkyl, C6-C10-aryl or alkaryl, C7-C11-aralkyl or C3-C6-alkoxyalkyl, in combination with light stabilizers from the category of the polyalkylpiperidine derivatives in the photopolymerization of ethylenically unsaturated compounds results in polymers with high stability to light and a low degree of yellowing.
Inventors
- 👤 Godwin Berner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:06
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/028; G03F7/031; C; C08; C08F; C08F2/00; C08F2/46; C08F2/48; C08F2/50; C09; C09D; C09D175/00; C09D175/04; C09D175/14; C09D175/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
49 words
A photocurable composition consisting essentially of (a) one or more ethylenically unsaturated, photocurable compounds, (b) at least one photo-initiator of the formula I ##STR4## in which Ar is phenyl and R is methyl or ethyl, and (c) at least one light stabiliser from the category of the polyalkylpiperidine derivatives.
Claim 2
Dependent Claim
49 words
A photocurable composition consisting essentially of (a) one or more ethylenically unsaturated, photocurable compounds, (b) at least one photo-initiator of the formula I ##STR4## in which Ar is phenyl and R is methyl or ethyl, and (c) at least one light stabiliser from the category of the polyalkylpiperidine derivatives.
Claim 3
Dependent Claim
54 words
A composition according to claim 1, consisting essentially of (a) one or more photopolymerisable compounds from the group comprising the acrylic and methacrylic acid derivatives, (b) a photo-initiator of the formula I, in which Ar is phenyl and R is methyl or ethyl, and (c) a light stabiliser from the category of the polyalkylpiperidines.
Claim 4
Dependent Claim
22 words
A composition according to claim 2, in which the light stabiliser (c) is an acrylic or methacrylic acid derivative of a polyalkylpiperidine.
Claim 5
Dependent Claim
53 words
A composition according to claim 1, consisting essentially of (a) a polyurethane acrylate or a mixture thereof with other acrylic or methacrylic acid derivatives, (b) a photo-initiator of the formula I in which Ar is phenyl and R is methyl or ethyl, and (c) a light stabiliser from the category of the polyalkylpiperidines.
Claim 6
Dependent Claim
22 words
A composition according to claim 4, in which the light stabiliser (c) is an acrylic or methacrylic acid derivative of a polyalkylpiperidine.
Claim 7
Dependent Claim
16 words
A composition according to claim 1, which contains 0.1 to 10% by weight of component (b).
Claim 8
Dependent Claim
16 words
A composition according to claim 1, which contains 0.02 to 5% by weight, of component (c).
Claim 9
Dependent Claim
16 words
A composition according to claim 7 which contains 0.5 to 2% by weight of component (c).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |