Liquid film based on silane-terminated polymers
AssigneeSika Technology AG
InventorsThomas Pusel, Raphael Teysseire, Willi Tenisch, Susanne Strauss, Barbara Jucker, Carsten Zilg
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Abstract
A composition that includes at least one silane-functional polymer P and 20 to 60% by weight of aluminum hydroxide or magnesium hydroxide or mixture thereof, is disclosed. The composition has a viscosity of 500 to 20,000 mPa·s measured according to DIN 53018 at a temperature of 20° C. The composition is suitable as a liquid membrane and has very good flammability properties, i.e., it is difficult to ignite and is self-extinguishing.
Claims20
A liquid composition that is suitable for applying as a fluid to a substrate to form a liquid membrane, the liquid composition comprising:
- a) at least one silane-functional polyurethane polymer P2 that is completely free of isocyanate groups;
- and
- b) 20 to 60% by weight of aluminum hydroxide, magnesium hydroxide or a combination thereof;
- wherein the liquid composition has a viscosity of 500 to 20,000 mPa·s that is measured according to DIN 53018 at a temperature of 20° C. and a shear rate of 10 s−1,
- wherein the at least one silane-functional polyurethane polymer P2 is obtained by a reaction of an isocyanatosilane IS with a polymer which has functional end groups which are reactive to isocyanate groups, wherein the reaction is performed in a stoichiometric ratio of (a number of groups which are reactive to isocyanate groups):a number of isocyanate groups) of 1:1 or in an excess of the number of groups which are reactive to isocyanate groups compared to the number of isocyanate groups, and
- wherein the composition does not contain any volatile organic solvents.
A liquid composition that is suitable for applying as a fluid to a substrate to form a liquid membrane, the liquid composition comprising:
- a) at least one silane-functional polymer P2;
- and
- b) 20 to 60% by weight of aluminum hydroxide, magnesium hydroxide or a combination thereof;
- wherein the liquid composition has a viscosity of 500 to 20,000 mPa·s that is measured according to DIN 53018 at a temperature of 20° C. and a shear rate of 10 s−1,
- wherein the at least one silane-functional polymer P2 is obtained by a reaction of an isocyanatosilane IS with a polymer which has functional end groups which are reactive to isocyanate groups, wherein the reaction is performed in a stoichiometric ratio of (a number of groups which are reactive to isocyanate groups):(a number of isocyanate groups) of 1:1 or in an excess of the number of groups which are reactive to isocyanate groups compared to the number of isocyanate groups, and
- wherein the composition does not contain a thixotropic agent.
Dependencies are inferred from the claim text.