EP0088845A2
Expired / Lapsed
EP
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Low shrinkage polymers and process for their preparation
Assignee: BTG International Ltd
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Filing: 1982-10-11
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Granted: —
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Expires: 2002-10-11
Abstract
Abstract A process for the preparation of a polymeric material that has a linear curing shrinkage of 1% or less involves mixing a liquid component containing, as its sole polymerisable constituent, one or more monomeric esters of general formula I wherein R is a hydrogen atom or a methyl radical and n is 1, 2, 3 or 4, with a solid component containing an acrylate polymer, a methacrylate polymer or a copolymer of these polymers, and initiating the polymerisation of the one or more monomeric esters in the liquid component. Preferred materials are tetrahydrofurfuryl methacrylate in the liquid component and polyethyl methacrylate in the solid component. The polymerisation is preferably initiated by benzoyl peroxide in the presence of a chemical activator, especially N, N - dimethyl - p - toluidine. The polymeric materials produced are particularly suitable for use in the formation of biomedical appliances, such as hearing aids, tooth filling, dental bridges and crowns, false teeth, artificial eyes and contact lenses, or for use in other biomedical applications, for example as a bone cement.I
Inventors
- 👤 Mangala Bhusate
- 👤 Michael Braden
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 06:53
CPC Classifications
C; C08; C08F; C08F265/00; C08F265/04; A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; H; H04; H04R; H04R25/00; H04R25/65; H04R25/658; H04R25/652
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
125 words
A process for the preparation of a polymeric material suitable for biomedical use and having a linear curing shrinkage of 1% or less comprises mixing a liquid component which contains one or more monomeric esters of general formula I wherein R is a hydrogen atom or a methyl radical, with a solid component which comprises one or more polymers selected from the group consisting of an acrylate polymer, a methacrylate polymer and a copolymer of these polymers, and initiating the polymerisation of the one or more monomeric esters in the liquid component, I characterised in that R is wherein n is 1, 2, 3 or 4 and further in that said one or more monomeric esters are the sole polymerisable constituent of the liquid component.
Claim 2
Dependent Claim
125 words
A process for the preparation of a polymeric material suitable for biomedical use and having a linear curing shrinkage of 1% or less comprises mixing a liquid component which contains one or more monomeric esters of general formula I wherein R is a hydrogen atom or a methyl radical, with a solid component which comprises one or more polymers selected from the group consisting of an acrylate polymer, a methacrylate polymer and a copolymer of these polymers, and initiating the polymerisation of the one or more monomeric esters in the liquid component, I characterised in that R is wherein n is 1, 2, 3 or 4 and further in that said one or more monomeric esters are the sole polymerisable constituent of the liquid component.
Claim 3
Dependent Claim
20 words
A process according to claim 1 characterised in that the liquid component contains, as its sole polymerisable constituent, tetrahydrofurfuryl methacrylate.
Claim 4
Dependent Claim
45 words
A process according to either claim 1 or claim 2 characterised in that the solid component comprises one or more polymers selected from the group consisting of polymethyl methacrylate, polyethyl methacrylate, poly propyl methacrylate, polybutyl methacrylate or copolymers of two or more of these polymers.
Claim 5
Dependent Claim
31 words
A process according to claim 3 characterised in that the solid component comprises polyethyl methacrylate or a copolymer of polyethyl methacrylate with one of polymethyl methacrylate, polypropyl methacrylate or polybutyl methacrylate.
Claim 6
Dependent Claim
42 words
A process according to any one of claims 1 to 4 characterised in that the polymerisation of the one or more monomeric esters in the liquid component is initiated by a free radical catalyst, preferably benzoyl peroxide, present in the solid component.
Claim 7
Dependent Claim
74 words
A process according to claim 5 characterised in that the free radical catalyst is activated by a chemical activator, selected from the group consisting of N, N - dialkyl - p-toluidines, N, N - dialkyl anilines and N - p - tolyldialkanolamines, preferably N, N - dimethyl - p - toluidine, N,N - diethyl - p - toluidine, N, N - dimethylaniline and N - p - toluene diethanolamine, present in the liquid component.
Claim 8
Dependent Claim
31 words
A polymeric material suitable for biomedical use and having a linear curing shrinkage of 1% or less whenever prepared by a process according to any one of claims 1 to 6.
Claim 9
Dependent Claim
14 words
A polymeric material according to claim 7 in the form of a biomedical appliance.
Claim 10
Dependent Claim
33 words
A polymeric material according to claim 8 in the form of a hearing aid, a tooth filling, a dental bridge or crown, dentures, an artificial eye, a contact lens or a bone cement.
Claim 11
Dependent Claim
105 words
A kit for use in the preparation of a polymeric material by a process according to claim 1 comprising (a) a liquid component which contains one or more monomeric esters of general formula I wherein R is a hydrogen atom or a methyl radical, and (b) a solid component which comprises one or more polymers selected from the group consisting of an acrylate polymer, a methacrylate polymer and a copolymer of these polymers characterised in that R is wherein n is 1, 2, 3 or 4 and further in that said one or more monomeric esters are the sole polymerisable constituent of the liquid component.
Claim 12
Dependent Claim
29 words
A kit according to claim 10 further comprising a free radical catalyst in the solid component and a chemical activator of the free radical catalyst in the liquid component.
References Cited (Backward Citations)
No citation records indexed.
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