Moisture curable polyurethane polymers
AssigneeEssex Specialty Products, Inc.
InventorsSidky D. Rizk, Harry W. S. Hsieh
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Abstract
Methods for making a moisture curable polyurethane polymer having terminal isocyanate groups and pendant alkoxysilane groups by reacting an isocyanatosilane adduct, having terminal isocyanate groups and at least one hydrolyzable alkoxy group bonded to silicon, with a polyisocyanate and a polyol; moisture curable polymers made by said methods; sealant compositions directly adherent to a non-porous substrate such as glass or metal without the use of a primer, said compositions comprising such a moisture curable polymer in combination with a filler; and methods for curing and using such sealant compositions.
Claims18
A method for making a moisture curable polyurethane polymer having terminal isocyanate groups and pendant silane groups having at least one hydrolyzable alkoxy group bonded to silicon, which method comprises 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.
A method for making a moisture curable polyurethane polymer having terminal isocyanate groups and pendant silane groups having at least one hydrolyzable alkoxy group bonded to silicon, which method comprises 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.