Compositions: coating or plastic – Coating or plastic compositions – Natural resin or derivative containing
Patent
1998-04-03
1999-08-10
Brunsman, David
Compositions: coating or plastic
Coating or plastic compositions
Natural resin or derivative containing
106221, 106311, 524270, C09D19300, C09D19304, C09D19100
Patent
active
059353120
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to dispersion adhesives containing aequous polymer dispersions known per se and optionally additional additives known per se, to which resin preparations according to the invention are added during the production thereof to specifically adjust the tackiness.
Adhesives may be prepared by dissolving suitable synthetic resins, natural resins or polymers in volatile organic solvents. The adhesive effect occurs following application of the adhesives and joining of the substrates to be joined by physical evaporation of the solvent and the remaining of the solid adhesive components.
Evaporation of the solvents has been the reason for short term and long term emissions of volatile organic compounds (VOC) into the ambient air and the environment, respectively. For a number of health and ecological reasons such VOC emissions are undesirable. Adhesives on the basis of water based polymer, plastic or synthetic resin dispersions are increasingly used in order to avoid such emissions. The solidification of which occurs during the evaporation of the water contained therein. Such adhesives are referred to as dispersion adhesives.
For dispersion adhesives in most cases no initial tackiness is required, e.g. in the numerous industrial manufacturing uses in which the parts to be joined may be clamped, pressed or fixed until the solidification of the adhesive and optionally also the setting of the adhesive can be accelerated by applying additional heat. Typical examples for these types of adhesives are packaging adhesives, paper adhesives or wood adhesives.
Other dispersion adhesives are used in fields in which a fixation of the parts to be joined or an accelerated thermal setting is impossible. In this case the adhesives must exibit sufficient initial tackiness immediately or shortly after the joining to fix the parts to be joined before the setting of the adhesive occurs. A typical field demonstrating said requirements is for example the adhesion of floor coverings, wall coverings and ceiling coverings in interiors.
Typically, in the preparation of dispersion adhesives tackifying resins are incorporated therein to provide said dispersion adhesives with the required initial tackiness. For this purpose natural resins, such as colophonium, and natural resin esters as well as mixtures thereof are preferably used. The selection of the resins available in a variety of forms depends on the requirements made on the adhesive and is familiar to the skilled artisan.
In the process for the preparation of the adhesive the resins present in solid up to viscous form must be brought into a form which is sufficiently liquid to be mixed into the dispersion preparation, which is also present in liquid form. Typically, to acquire said liquid form of the resins, there is prepared in a separate operation step a liquid resin preparation, which then is incorporated into the mixture of the other adhesive components.
Liquid resin preparations of this type are prepared according to known prior art by dissolving the resins in highly volatile organic solvents. The resin solutions obtained in this manner are incorporated into the mixture of the other adhesive components at room temperature. However, this method results in the introduction of volatile organic solvents into the adhesive, which are referred to as low solvent or solvent containing dispersion adhesives, depending on the proportion of the solvent.
Generally, the highly volatile solvents used exhibit a boiling point below 200.degree. C. and a steam pressure of more than 100 Pa under normal conditions. The evaporation of which already occurs partly during or immediately after the application of the adhesive, partly in the course of weeks and months, and is the reason for high voc emissions and contamination of the ambient air, which regarding working, environmental and consumer protection represent a substantial problem and are thererore undesirable.
EP 0 221 461 describes such a method, in which tackifying resins are used in the form of 70% solutions in toluene. T
REFERENCES:
patent: 4731402 (1988-03-01), Penzel et al.
patent: 4740324 (1988-04-01), Schur
patent: 5149741 (1992-09-01), Alper
patent: 5169889 (1992-12-01), Kauffman et al.
patent: 5534571 (1996-07-01), Aydin et al.
Brunsman David
Uzin Utz Aktiengesellschaft
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