Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1985-09-10
1987-06-09
Kight, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
106 35, 433214, 525381, 525382, 5253726, A61K 610, C08C 1900
Patent
active
046720812
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a two part impression material, suitable for use as a dental impression material, to a method of preparing the impression material and to a process for using the two part impression material to obtain an impression.
British Pat. No. GB 2 027 035B discloses a two-part dental impression material comprising a first part containing a product of the reaction of an alpha, beta ethylenically unsaturated dicarboxylic acid anhydride and a liquid polydiene resin and a second part containing a setting agent which has at least two reactive hydrogen atoms per molecule and is capable of forming a cross-link between molecules of said reaction product. The patent states that suitable setting agents include amines, polyols, amides, alkanolamines and alkanolamides. Also included are polyepoxides in combination with an epoxide ring-opening or carboxylic anhydride ring-opening compound.
Some of the requirements of a dental impression material are indicated in the introduction of No. GB 2 027 035B and British Standard Specification No. BS 4269: Part 1: 1968 specifies a number of physical properties required by an elastomeric dental impression material.
It has now been found that the use of certain alkoxylated setting agents provides impression materials having improved performance as compared with the dental impression materials described in No. GB 2 087 035B. In particular, the use of the selected setting agents enables the impression materials to satisfy the criteria of No. BS 4269: Part 1: 1968.
Thus, according to the present invention a two part impression material, suitable for use as a dental impression material, comprising a first part containing a product of the reaction of an alpha, beta-ethylenically unsaturated dicarboxylic acid anhydride and a liquid polydiene resin and a second part containing a setting agent for the said reaction product is characterised in that the setting agent is an alkoxylated fatty monoamine or an alkoxylated fatty polyamine having from 2 to 30 moles of alkoxylate per mole of the fatty amine, the alkoxylate groups being one or more alkoxylates selected from the group comprising ethoxylate, propoxylate and butoxylate groups.
Although the two part impression material according to the present invention is particularly suitable for use as a dental impression material, it may be used in other applications. For example, the two part impression material may be used to take an impression of an ear for use in the fitting of hearing aids. Thus, although the invention will be described hereinafter with particular reference to its use as a dental impression material this should not be taken as limiting the invention to this application.
The present invention includes a method of preparing an impression material, particularly a dental impression material, which method comprises mixing together the two parts of the impression material as described above and also includes the product of the reaction between the first and second part of the impression material.
The invention also includes a method of taking a dental impression which comprises placing in a dental impression mould a dental impression material prepared by mixing together the two parts of the impression material as hereinbefore described, bringing the mould into contact with the patient's teeth or jaws or with a dental model or prosthesis, allowing the dental impression material to set and thereafter removing the mould to leave an impression in the dental impression material.
Alkoxylated monoamines and polyamines are known and some are commercially available. They may be prepared by alkoxylating fatty amines by known methods. The fatty amines are preferably derived from a C.sub.8 to C.sub.22 compound containing one or more saturated or unsaturated fatty acid. More preferably, the fatty amines are derived from C.sub.12 to C.sub.18 compounds such as, for example, oleic, lauric, palmitic or stearic acid, tallow or hydrogenated tallow, coconut oil or soya bean oil. The alkoxylate groups are preferably ethoxylate or
REFERENCES:
patent: 4341716 (1982-07-01), Diery et al.
Fisher Robert G.
James Keith
Pring Graham M.
Kight John
Moore M. L.
The British Petroleum Company p.l.c.
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