Bonding method employing moisture curable polyurethane polymers
AssigneeEssex Specialty Products, Inc.
InventorsSidky D. Rizk, Harry W. S. Hsieh
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Abstract
Methods for bonding a material to a non-porous substrate such as glass using a moisture curable sealant composition comprising a filler and a polyurethane polymer having terminal isocyanate groups and pendant silane groups having at least one alkoxy group bonded to silicon.
Claims10
The method of bonding a material to a non-porous substrate which comprises joining said material and substrate with a moisture curable sealant composition and permitting said composition to cure in the presence of atmospheric moisture, said composition comprising at least one filler in combination with a moisture curable polyurethane polymer having terminal isocyanate groups and pendant silane groups having at least one hydrolyzable alkoxy group bonded to silicon, made by reacting
- (1) an isocyanatosilane adduct having at least two isocyanato groups and
- (2) an isocyanate different from (1) and having at least two isocyanato groups with
- (3) a polyol,
- said isocyanatosilane adduct being the reaction product of an isocyanate having at least three isocyanato groups with an organofunctional alkoxysilane.
The method of bonding a material to a nonporous substrate which comprises joining said material and substrate with a moisture curable sealant composition and permitting said composition to cure in the presence of atmospheric moisture, said composition comprising at least one filler in combination with a moisture curable polyurethane polymer having terminal isocyanate groups and pendant silane groups having at least one hydrolyzable alkoxy group bonded to silicon, made by reacting
- (1) an isocyanatosilane adduct having at least two isocyanato groups and
- (2) an isocyanate different from (1) and having at least two isocyanato groups with
- (3) a polyether polyol,
- said isocyanato adduct being the reaction product of an isocyanate having at least three isocyanato groups with an organofunctional mercaptoalkoxysilane or aminoalkoxysilane, the number of said pendant silane groups being from 2 to 50 equivalent percent of the total number of isocyanato groups theoretically available in said isocyanate having at least three isocyanato groups and said isocyanate (2) having at least two isocyanato groups.
Dependencies are inferred from the claim text.