Two-component adhesive/sealing mass with high initial adhesiveness
AssigneeHenkel-Teroson GmbH
InventorsManfred Proebster, Werner Schumacher
Life of this patent
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Abstract
Two component adhesive/sealing masses based on silane terminated prepolymers contain a component A which is a one-component, humidity hardening adhesive/sealing mass with high initial adhesiveness, and a component B which is a crosslinking agent and/or accelerator for component A are disclosed. These adhesive/sealing masses are suitable for gluing without primer parts made of metals or other materials such as aluminum, steel, glass, wood or plastics. In a particularly preferred embodiment, component B consists of a viscous, stable mixture of plasticisers, water, thickeners and other optional auxiliary substances.
Claims25
A two component adhesive or sealant composition comprising a component A and a component B, wherein
- (I) component A is a one-component moisture-curing adhesive or sealant comprised of one or more silane-terminated polyether prepolymers, wherein the silane-terminated polyether polymers contain at least one reactive terminal group corresponding to the formula:
- ##STR2## in which n is 1 to 4 and R.sup.1, R.sup.2 and R.sup.3 are selected from the group consisting of non-hydrolyzable C.sub.1-4 alkyl groups and hydrolyzable alkoxy, acetoxy, oxime ether and amide groups wherein at least one of R.sup.1, R.sup.2, ana R.sup.3 is hydrolyzable;
- and
- (II) component B is a paste-form stable mixture comprised of at least one plasticizer, water, and at least one thickener;
- wherein component A alone or a mixture formed by mixing component A and component B has an early strength immediately after application and joining of at least 0.16 N/cm.sup.2 as measured in accordance with DIN 53273.
A two-component adhesive or sealant composition comprising a component A and a component B, wherein
- (I) component A is a one-component moisture-curing adhesive or sealant comprised of one or more silane-terminated polyether prepolymers having a molecular weight of from 1,000 to 50,000 and containing at least one reactive terminal group corresponding to the formula ##STR3## in which n is 1 to 4 and R.sup.1 to R.sup.2 and R.sup.3 are selected from the group consisting of non-hydrolyzable C.sub.1-4 alkyl groups and hydrolyzable alkoxy, acetoxy, axime ether and amide groups wherein at least two of R.sub.1, R.sup.2, and R.sup.3 are hydrolyzable;
- and
- (II) component B is a paste-form stable mixture comprised of water, at least one plasticizer selected from the group consisting of phthalic acid esters, aryl sulfonic acid esters, alkyl phosphates, aryl phosphates, and dialkyl esters of aliphatic and aromatic dicarboxylic acids, and at least one thickener selected from the group consisting of agar agar, carrageen, tragacanth, arabic gum, alginates, pectins, polyoses, guar flour, starch, dextrins, gelatin, casein, carboxymethyl cellulose, cellulose ethers, hydroxyethyl cellulose, hydroxypropyl cellulose, poly(meth)acrylic acid derivatives, polyvinyl ethers, polyvinyl alcohol, polyamides, polyimines, polysilicic acids, highly disperse silicas, pyrogenic hydrophilic silicas, and clay minerals;
- wherein component A alone or a mixture formed by mixing component A and component B has an early strength immediately after application and joining of at least 0.16 N/cm.sup.2 as measured in accordance with DIN 53273.
A process for bonding two or more substrates without a primer, comprising the steps of
- (a) mixing a component A with a component B in a ratio of about 5:1 to about 15:1 parts by weight to form a mixture;
- (b) applying said mixture to a first substrate comprised of metal or painted metal to provide a free adhesive or sealant surface;
- and
- (c) applying a second substrate comprised of metal or painted metal to the free adhesive or sealant surface to establish a bond, wherein the bond thus established can be immediately further processed or transported without further mechanical fixing;
- wherein component A is a one-component moisture-curing adhesive or sealant comprised of one or more silane-terminated polyether prepolymers containing at least one reactive terminal group corresponding to the formula:
- ##STR4## in which n is 1 to 4 and R.sup.1, R.sup.2, and R.sup.3 are selected from the group consisting of non-hydrolyzable C.sub.1-4 alkyl groups and hydrolyzable alkoxy, acetoxy, oxime ether and amide groups wherein at least one R.sup.1, R.sup.2, and R.sup.3 hydrolyzable and component B is a paste-form stable mixture comprised of at least one plasticizer, water and at least one thickener.
Dependencies are inferred from the claim text.