Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
  • C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
  • C08G65/32—Polymers modified by chemical after-treatment
  • C08G65/329—Polymers modified by chemical after-treatment with organic compounds
  • C08G65/333—Polymers modified by chemical after-treatment with organic compounds containing nitrogen
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K6/00—Preparations for dentistry
  • A61K6/90—Compositions for taking dental impressions

Definitions

• the invention relates to preparations based on aziridino polyethers which harden after mixing two separately stored components by polymer-forming reactions.
• the invention describes preparations which are distinguished by an easily adjustable, relatively long processing time after mixing and a low degree of acidity of the catalyst component.
• the processor is particularly interested in two characteristic values of this curve: the processing time and the time until the hardenable mass can be further processed.
• the processing time is understood to be the period between the complete mixing of the two components and the beginning of the hardening of the mixed preparation at room temperature.
• This start of polymerization is regarded as the point in time at which a mixed two-component preparation changes from the plastic phase into the elastic phase and shows marked changes, such as skin formation, stringing and greatly reduced flowability.
• the mixed preparation can still be processed until shortly before this time and shows the required flow to the respective substrates.
• the processor wishes a processing time of about 0.5 to 4 minutes at room temperature in order to have enough time, the repeated placement and metering of the hardening mass and, if necessary To be able to carry out corrective measures.
• setting long processing times proves to be particularly difficult.
• the demand for long processing times is usually associated with the desire to enable the hardenable mass to be processed further after a short period of time.
• Processing times at room temperatures of 2 to 4 minutes can be achieved and the further processing of the impression can be guaranteed in less than 7 minutes after the end of the mixture.
• Further processing is understood to mean, for example in the dental field, the removal of the hardened impression from the patient's mouth. This must not be done too early, otherwise the precision of the impression will be destroyed by the not yet fully set mass.
• the setting system is set by the initiation system, i. H. through the interaction of suitably chosen starters and retarders.
• N-alkylaziridino compounds can harden under the action of acidic compounds (H. Bestian, Methods of Organic Chemistry (Houben-Weyl), XII / 1 (1958)).
• a summary of the starter substances used for the curing of N-alkylaziridino compounds is contained in OC DERMER, GE HAM, "Ethyleneimine and other Aziridines” Academic Press (1969).
• connection classes and connections have therefore proven to be suitable in principle.
• DE-A-197 53 461 discloses storage-stable, cationically polymeric preparations with improved curing behavior based on compounds containing N-alkylaziridino groups, which contain soluble and / or finely divided alkaline earth metal and / or alkali metal compounds to increase storage stability. These can be added to both the catalyst component and the base component, the addition to the base component being the preferred embodiment.
• the object of the invention is therefore to provide catalyst components for two-component preparations based on compounds containing N-alkylaziridino groups, these being
• Catalyst components ensure a well reproducible setting of the setting process and the resulting properties, and do not cause irritation, burns, corrosion or destruction of the packaging, even in the unmixed state.
• 3100 can be produced from a polyether diol which contains ethylene oxide and tetrahydrofuran
• Units in a molar ratio of 1: 3.5 comprises within 0.5 to 20 minutes a solid elastomer mass solidifies, which after 24 hours of storage at room temperature has a Shore A hardness of at least 20 according to DIN 53505.
• the times specified here are not to be understood as processing time or time of further processing in the sense of the above. These are the setting times to be achieved in the sense of a test system.
• the bisaziridino polyether used as the test substance for the catalyst component is made from a polyether diol which is accessible by cationic copolymerization of ethylene oxide and tetrahydrofuran under the catalytic action of boron fluoride etherate, the reaction procedure resulting in a molar incorporation ratio of ethylene oxide to tetrahydrofuran of 1: 3.5 is set, synthesized by reaction with crotonic anhydride and subsequent addition of ethyleneimine, as set out in US Pat. No. 3,453,242, Example 13.
• the constituents of the catalyst components are preferably defined as follows:
• Diluent (E) 0 to 50% by weight, preferably 0 to 30% by weight, of modifiers, including fillers, dyes, pigments, thixotropic agents,
• a large number of classes of compounds and acidic compounds are suitable for use as the acid according to component (A).
• both organic and inorganic acids are suitable.
• the speed of the hardening reaction shows, in addition to other dependencies, a clear dependence on the acid strength.
• Very strong acids such as hexafluoroantimonic acid, hexafluorophosphoric acid or tetrafluoroboric acid, are distinguished by high rates of cationic polymerization.
• High reaction rates are also of sulfonic acids, such as 4-toluenesulfonic acid, 4-phenolsulfonic acid, 4-bromobenzenesulfonic acid, 4-chlorobenzenesulfonic acid, benzenesulfonic acid,
• Alkylbenzenesulfonic acids especially dodecylbenzenesulfonic acid, naphthalene-2-sulfonic acid and alkanesulfonic acids.
• phosphonic acids such as vinylphosphonic acid and propylphosphonic acid is also possible.
• polymeric acids such as polyvinylphosphonic acid, polyacrylic acid, copolymer acids, prepared from maleic anhydride with other monomers is also possible if it is possible to achieve a stable distribution state of these polymers in the catalyst component. is also possible if it is possible to achieve a storage-stable distribution state of these polymers in the catalyst component.
• Saturated and unsaturated carboxylic acids such as propionic acid, succinic acid, tartaric acid, thmellitic acid, benzoic acid, phenylacetic acid, citric acid, maleic acid, adipic acid, o-chlorobenzoic acid or reaction products of polyhydric alcohols and acid anhydrides such as maleic anhydride and succinic anhydride can also be used.
• the preparations according to the invention contain at least one acid as component (A); the use of several acids is possible and may be useful to adjust the setting process.
• the water used according to component (B) can either be added to the acids or added to the preparation at a later stage in the preparation of the catalyst component.
• the amount of water depends on the solubility of the acids in the other constituents of the catalyst component, the desired course of curing and other properties of the catalyst component and the hardened impression material.
• the oxides, hydroxides, carbonates and carboxyates Elements aluminum, chrome, copper, germanium, manganese, lead, antimony, tin, tellurium, titanium and zinc are used.
• the use of aluminum and zinc compounds is preferred.
• Zinc compounds such as zinc hydroxide, zinc oxide, zinc carbonate or mixtures of these compounds are used with particular advantage.
• the ratio between the components (A) and (C) can be varied within wide limits. However, it has proven to be advantageous to use 0.5 to 2.0 base equivalents from component (C) for an acid equivalent from component (A). A ratio of one acid equivalent to 0.7 to 1.2 base equivalents is particularly preferred.
• polyether polyols such as polypropylene glycols or mixed polyetherols with tetrahydrofuran and / or ethylene oxide and / or propylene oxide units
• polyester polyols such as polycaprolactone diols and polycaprolactone triols
• polycarbonate diols such as polycarbonate diols, aliphatic esters, oils, fats, hydrocarbons, waxes , Araliphatic hydrocarbons and mono- or polyfunctional esters of polyvalent acids, such as phthalic acid or citric acid or esters or amides of alkyl sulfonic acids and aryl sulfonic acids.
• Modifiers can be added to the catalyst component as component (E). These include finely divided fillers such as aluminosilicates, silicas, quartz powder, wollastonite, gum flour and diatomaceous earth as well as dyes and pigments, the addition of which enables a better assessment of the mixing quality and reduces the risk of confusion, thixotropic agents such as finely dispersed silicas and other additives which influence the flow behavior, such as polymeric thickeners , also surface-active substances for adjusting the pouring behavior, as well as odorants and / or flavorings.
• the necessary water concentration in the hardening preparation can be determined by tests, at least some of the necessary water before the mixing can also be present in the base component.
• the appropriate concentrations of water and antacid compounds can be determined using a simple test.
• the base component can only consist of aziridine monomers, as described, for example, as a test substance for the catalyst component.
• the base component can contain:
• the two components are stored separately and mixed for processing in a ratio of catalyst component to base component of 5: 1 to 1:20, preferably 1: 1 to 1:10.
• the catalyst components according to the invention can be produced in different ways.
• the Bronsted acid can be dissolved together with water at 20 ° C to 90 ° C, preferably 50 ° C to 70 ° C in a part or the total amount of the inert diluent according to component (D) and before or after the incorporation of filler and Dyes the antacid-active compound are added as a powder, as a paste or as a suspension.
• a paste is prepared from the components (A), (B), (D) and (E) and then the antacid-active compounds (C) are added, it being particularly preferred to use the antacid-active compounds in Form of a paste or a suspension, each made up of a part of the diluent and the antacid-active compounds.
• the catalyst components according to the invention for two-component preparations which harden by polymer-forming reactions and are based on N-alkylaziridino compounds can be used, depending on the composition of the catalyst component and the base component, for bonding substrates, for sealing, for coating and for potting.
• the dosing of the two components can be done by sight (string length comparison), by weight, via pre-metered packing units and subsequent manual mixing, from double-chamber cartridges with a static mixing tube or by means of volume metering systems with a downstream static or dynamic mixer.
• the tolerance of the mixing ratio is generally relatively large and, for example, given a predetermined ratio of catalyst component to base component of 1: 5, can range from 0.8 to 1.2: 5, without any changes in properties which limit the use being ascertainable.
• the preparations according to the invention can advantageously be used for the molding of objects or parts of the body, with the preparations according to the invention being able to obtain detailed impressions on account of their excellent flow behavior.
• the preparations according to the invention are used with particular advantage in dental and dental technology impressions.
• the invention also relates to containers and mixing devices containing the compositions produced from the preparations according to the invention, in particular dental compositions such as cartridges, bags, impression spoons, static and dynamic mixers or mixing devices.
• the catalyst components described in Table 1 were produced on a 100 g scale using laboratory kneaders.
• the acids (A) were dissolved in water (B), 70% of the specified diluent (D) were added, the filler (E) was kneaded in, and then the suspension of the antacid-active compounds (C) in 30% of the specified amount of diluent (D) added.
• the base component the composition of which is given in Table 3, was produced on a 500 g scale.
• the mouth removal time could be determined as the average of three impressions from three different subjects in the form of a complete maxillary impression.
• the bisaziridinopolyether used as test substance for the catalyst component is made from a polyether diol which is accessible by cationic copolymerization of ethylene oxide and tetrahydrofuran under the catalytic action of boron fluoride etherate, the reaction procedure setting a molar incorporation ratio of ethylene oxide to tetrahydrofuran of 1: 3.5 , synthesized by reaction with crotonic anhydride and subsequent addition of ethyleneimine, as set out in US Pat. No. 3,453,242, Example 13.
• One part by weight of the catalyst components K1 to K10 described in Table 1 were mixed with three parts by weight of the test substance: bis-aziridinopolyether with an imino equivalent mass of 3100 g / equivalent, prepared from a polyether diol which consists of ethylene oxide and tetrahydrofuran units in a molar ratio of 1: 3, 5 exists, mixed.
• All of the catalyst components according to the invention had a low degree of acidity corresponding to the pH values given in Table 2, which were measured with a conventional electrode, from which a KCI solution emerged as an electrolyte during the measurement.
• the catalyst components according to the invention did not cause skin irritation.
• Packaging plastics such as polyamide, polyoxymethylene diacetate or laminate film, were not destroyed even after 3 months of storage at 50 ° C. in contact with the catalyst components according to the invention.
• Acidity levels of the catalyst components according to the invention determined as pH
• a catalyst component of the following composition was produced.
• this catalyst component could not achieve processing times of over 100 seconds, which is necessary for a number of applications.
• the desired processing time can be set by the choice of the antacid compound, the molar ratio of the acids to the antacid compounds and by the water content.
• the mouth removal time is also changed, but when using the catalyst components according to the invention it is in the range customary for precision impressions.

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• Health & Medical Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Epidemiology (AREA)
• Animal Behavior & Ethology (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Medicinal Chemistry (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Dental Preparations (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Polyethers (AREA)

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• 2000
  • 2000-04-17 DE DE10018918A patent/DE10018918C2/de not_active Expired - Fee Related
• 2001
  • 2001-04-12 EP EP01919451A patent/EP1274769B1/de not_active Expired - Lifetime
  • 2001-04-12 WO PCT/EP2001/004217 patent/WO2001079328A1/de not_active Ceased
  • 2001-04-12 US US10/257,760 patent/US8415266B2/en not_active Expired - Fee Related
  • 2001-04-12 AU AU2001246542A patent/AU2001246542A1/en not_active Abandoned
  • 2001-04-12 JP JP2001576919A patent/JP2003533556A/ja not_active Withdrawn

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