Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1997-10-15
1999-10-26
Hoke, Veronica P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
156327, 156329, 1563317, 524313, 524588, 524590, C08K 511, C09J 400
Patent
active
059730471
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a moisture-curing sealing and adhesive compound based on a fully synthetic polymer, to its production and to its use.
Polyurethane-based moisture-curing sealing compounds are well known to the expert, for example from DE 37 26 547 and DE 39 43 090. According to these documents, they consist essentially of isocyanate-terminated polyurethane prepolymers. The non-sag behavior of jointing compounds was achieved by the addition of fine-particle solids--also referred to as fillers. In general, these fine-particle solids make a significant contribution towards ensuring that the sealing compound retains the necessary internal cohesion after application to stop it from running or bulging downwards from vertical joints. The additives or fillers mentioned may be divided into pigments and thixotropicizing fillers, also referred in short as thixotropic agents. In the case of jointing compounds based on polyurethane prepolymers, these thixotropic agents have to meet additional requirements. For example, there should be no unwanted reactions with the isocyanate groups. Accordingly, the thixotropic agents mainly used are swellable polymer powders, for example polyacrylonitrile, polyurethane, polyvinyl chloride, polyacrylates, polyvinyl alcohols, polyvinyl acetates and the corresponding copolymers. Particularly good results can be obtained with fine-particle polyvinyl chloride powder.
The properties of polyurethane jointing compounds can be further improved by adding other components to the polymer powder used as thixotropic agent. These other components are substances which belong to the category of plasticizers or swelling agents and swelling aids used for plastics. The optimal composition of the prepolymer/polymer powder/plasticizer/swelling aid systems has to be determined in each case. For example, neither the plasticizer nor the swelling aid should react with the isocyanate groups of the prepolymer. Accordingly, plasticizers from the class of phthalic acid esters are suitable, for example, for polyvinyl chloride powder as the thixotropic agent. Examples of suitable compounds from this class are dioctyl phthalate, dibutyl phthalate and benzyl butyl phthalate. Other classes of compounds which have the required properties are chloroparaffins, alkyl sulfonic acid esters, for example of phenols or cresols, and fatty acid esters. Plasticizers based on alkyl sulfonic acid esters and polyvinyl chloride are particularly preferred as the swellable polymer powder.
Although satisfactory non-sag behavior is generally achieved with these known agents, it could be improved in certain cases, for example in the case of wide joints or at high temperatures. In addition, it is desirable for environmental reasons completely to replace PVC.
In the case of adhesives, too, there are applications where the form in which the adhesive is applied should remain intact, for example in bonding in bead form on vertical walls or in the application of floor adhesives with a serrated spatula.
Accordingly, the problem addressed by the present invention was largely to avoid these disadvantages and to improve the non-sag behaviour of sealing and adhesive compounds without affecting other processing and performance properties.
DETAILED DESCRIPTION OF THE INVENTION
This problem is solved by the incorporation of at least one triglyceride with no OH groups in the moisture-curing compounds based on fully synthetic polymers. One triglyceride is preferably used although two or three triglycerides may also be used.
Triglycerides in the context of the invention are esters of glycerol of which the three hydroxy groups are esterified with the same or different carboxylic acids.
Preferred carboxylic acids are aliphatic carboxylic acids of which the carbon chain is almost completely unbranched and which contain from 8 to 26 carbon atoms and, more particularly, from 10 to 22 carbon atoms. These fatty acids may be unsaturated, but are preferably saturated and, apart from the COOH groups, have no other functional
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Dziallas Michael
Ernst Wolfgang
Klein Johann
Majolo Martin
Podola Tore
Harper Stephen D.
Henkel Kommanditgesellschaft auf Aktien
Hoke Veronica P.
Jaeschke Wayne C.
Szoke Ernest G.
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