Thixotropic composition that can be used as an anti-running agent for mastics
AssigneeBostik SA
InventorsFederico Sanz, Lars Thilander, Patrick Verneaut
Life of this patent
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Abstract
An adhesive sealant composition of at least one moisture-crosslinkable prepolymer and an anti-sagging agent of 5% to 30% by weight of a thixotropic composition of 10% to 40% by weight of a bisurea a) obtained by reaction of a primary aliphatic amine a1) with a diisocyanate a2) having a molar mass of less than 500 g/mol, and 60% to 90% by weight of an ester b) of formula (I): in which R1, R2 and R3 are an oxycarbonylalkyl radical having from 4 to 20 carbon atoms, R4 is hydrogen, methyl or ethyl or —CH2—R5 in which R5 is oxycarbonylalkyl having from 4 to 20 carbon atoms, in the form of a suspension of solid particles of bisurea a) in a continuous phase formed by ester b).
Claims12
An adhesive sealant composition comprising at least one moisture-crosslinkable prepolymer and, as anti-sagging agent, from 5% to 30% by weight, on the basis of the total weight of said adhesive sealant composition, of a thixotropic composition comprising 10% to 40% by weight of a bisurea a) obtained by reaction of a primary aliphatic amine a1) with a diisocyanate a2), said diisocyanate a2) having a molar mass of less than 500 g/mol, and
- from 60% to 90% by weight of an ester b) of formula (I):
- in which:
- R1, R2 and R3, which are identical or different, each represent an oxycarbonylalkyl radical having from 4 to 20 carbon atoms;
- R4 represents a hydrogen atom, a methyl or ethyl radical or a radical:
- —CH2—R5 in which R5 represents an oxycarbonylalkyl radical having from 4 to 20 carbon atoms;
- said thixotropic composition being in the form of a suspension of solid particles of bisurea a) in a continuous phase formed by the ester b).
Dependencies are inferred from the claim text.