EP0059649A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Dental compositions
Assignee: Syngenta Ltd
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Filing: 1982-03-04
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Granted: —
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Expires: 2002-03-04
Abstract
Abstract A visible light cure fluid dental composition which comprises at least one polymerisable ethylenically unsaturated material, from 40% to 90% by weight of the composition of at least one particulate filler, and a catalyst which comprises at least one ketone having photosensitive catalytic action selected from fluorenone and a-diketones and their derivatives, and at least one organic peroxide, and a method for their preparation and use.
Inventors
- 👤 Maurice James Ratcliffe
- 👤 Derek Joseph Shaw
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 12:25
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; Y; Y10; Y10S; Y10S522/00; Y10S522/908
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
58 words
A visible light cure fluid dental composition which comprises at least one polymerisable ethylenically unsaturated material, from 40% to 90% by weight of the composition of at least one particulate filler, and a catalyst which comprises at least one ketone having photosensitive catalytic action selected from fluorenone and a-diketones and their derivatives, and at least one organic peroxide.
Claim 2
Dependent Claim
58 words
A visible light cure fluid dental composition which comprises at least one polymerisable ethylenically unsaturated material, from 40% to 90% by weight of the composition of at least one particulate filler, and a catalyst which comprises at least one ketone having photosensitive catalytic action selected from fluorenone and a-diketones and their derivatives, and at least one organic peroxide.
Claim 3
Dependent Claim
22 words
A composition according to claim 1 in which the concentration of ketone is from 0.01% to 2% by weight of polymerisable material.
Claim 4
Dependent Claim
27 words
A composition according to either claim 1 or claim 2 in which the concentration of organic peroxide is from 0.1% to 20% by weight of polymerisable material.
Claim 5
Dependent Claim
74 words
A composition according to any one of claims 1 to 3 in which the a-diketone has the formula in which the groups A which may be the same or different, are hydrocarbyl or substituted hydrocarbyl groups and in which the groups A may be further linked together by a divalent link or by a divalent hydrocarbyl or substituted hydrocarbyl group or in which the groups A together may form a fused aromatic ring system.
Claim 6
Dependent Claim
12 words
A composition according to claim 4 in which the a-diketone is camphorquinone.
Claim 7
Dependent Claim
17 words
A composition according to any one of claims 1 to 3 in which the ketone is fluorenone.
Claim 8
Dependent Claim
68 words
A composition according to any one of claims 1 to 6 in which the organic peroxide has a ten hour half life temperature of less than 150 0 C and has the formula R - 0 - 0 - R in which the groups R which may be the same or different are hydrogen, alkyl, aryl or acyl groups, no more than one of the groups being hydrogen.
Claim 9
Dependent Claim
15 words
A composition according to claim 7 in which the organic peroxide is tertiary butyl perbenzoate.
Claim 10
Dependent Claim
31 words
A composition according to any one of claims 1 to 8 which includes a reducing agent which is capable of reducing the ketone when the latter is in an excited state.
Claim 11
Dependent Claim
106 words
1 0 . A composition according to claim 9 in which the reducing agent is an organic amine which has the formula R 4 3 N where the groups 4, which may be the same or different, are hydrogen atoms, hydrocarbyl groups, substituted hydrocarbyl groups or groups in which two units R 4 together with the nitrogen atom form a cyclic ring system, no more than two of the units R 4 being hydrogen atoms and where R 4 is attached directly to an aromatic group R 4 , at least one of the other units R 4 has a group attached to the nitrogen atom.
Claim 12
Independent Claim
35 words
A method of curing a composition as claimed in any one of claims 1 to 10 which comprises irradiating the composition with visible light having a wavelength in the range 400 mp to 500 mu.
Claim 13
Dependent Claim
45 words
Method fcr the production of a composition as claimed in any one of claims 1 to 10 in which the components are mixed after addition of the photosensitive catalyst in the absence of visible light having wavelength in the range 400 mµ to 500 mµ.
References Cited (Backward Citations)
No citation records indexed.
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