Primer for improving the bonding of adhesives to nonporous substrates
AssigneeAdco Products, Inc.
InventorsXiaobin Wang, Brian J. Briddell
Life of this patent
Estimating the term…
Abstract
A primer for promoting adhesion between an elastomeric adhesive and a nonporous substrate containing a silane-modified saturated polyester polymer and an adhesion promoter in an anhydrous solvent. The invention is also directed to a silane-modified saturated polyester polymer, and an adhesion promoter made by the reaction of a multifunctional isocyanate and an organosilane.
Claims13
A silane-modified polyester polymer of the formula:
- ##STR6## wherein:
- the ##STR7## represents a moiety of a difunctional polyester polyol of general formula ##STR8## X represents an ##STR9## group or an S, and each X may be the same or different;
- each R represents a divalent organic moiety;
- each R.sup.1 represents hydrogen or a C.sub.1-4 alkyl group;
- each R.sup.2 represents a C.sub.1-6 alkyl group;
- each R.sup.3 represents H, a C.sub.1-6 organic moiety, or a second RSiR.sup.1.sub.n (OR.sup.2).sub.3-n group, which may be the same as or different from the first such group;
- each R.sup.4 represents a divalent organic moiety;
- and n is 0 or 1.
A silane-modified polyester polymer made by a process comprising reacting a difunctional polyester polyol dissolved in an anhydrous solvent with at least one isocyanatosilane of the formula:
- O.dbd.C.dbd.N--RSiR.sup.1.sub.n (OR.sup.2).sub.3-n
- wherein:
- each R represents a divalent organic moiety;
- each R.sup.1 represents hydrogen or a C.sub.1-4 alkyl group;
- each R.sup.2 represents a C.sub.1-6 alkyl group;
- and n is 0 or 1;
- wherein the molar ratio of said isocyanatosilane to said difunctional polyester polyol is at least about two to one.
Dependencies are inferred from the claim text.