Polyurethane-based pressure-sensitive adhesives, systems for such adhesives, articles therefrom, and methods of making
Assignee3M Innovative Properties Company
InventorsLawrence M. Clemens, Richard G. Hansen
Life of this patent
Estimating the term…
Abstract
Polyurethane-based pressure-sensitive adhesives (PSAs) of the invention comprise the reaction product of: a polyol component comprising at least one diol having a weight average molecular weight of at least about 2,000, wherein the at least one diol comprises less than about 8 weight % monols; an isocyanate-functional component; an optional reactive emulsifying compound; and an optional chain extending agent. The PSAs can be prepared from 100% solids, waterborne or solventborne systems.
Claims23
A polyurethane-based pressure-sensitive adhesive comprising the reaction product of:
- a polyol component comprising at least one diol having a weight average molecular weight of at least about 3000, wherein the at least one diol comprises less than about 8 weight % monols;
- an isocyanate-functional component;
- an optional reactive emulsifying compound;
- and
- an optional chain extending agent;
- wherein the adhesive is prepared from a waterborne system.
A method of preparing a polyurethane-based pressure-sensitive adhesive comprising the steps of:
- providing a polyol component comprising at least one diol having a weight average molecular weight of at least about 3,000, wherein the at least one diol comprises less than about 8 weight % monols;
- providing an isocyanate-functional component;
- optionally providing a reactive emulsifying compound;
- allowing the polyol component, the isocyanate-functional component, and the optional reactive emulsifying compound to react to form a polyurethane prepolymer;
- dispersing the polyurethane prepolymer in a dispersing medium comprising water;
- and
- chain extending the polyurethane prepolymer.
Dependencies are inferred from the claim text.