Polyurethane-based adhesives, systems for such adhesives, articles therefrom, and methods of making
Assignee3M Innovative Properties Company
InventorsRichard G. Hansen, Lawrence M. Clemens
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Abstract
Polyurethane-based adhesives of the invention comprise the reaction product of: an isocyanate-reactive component comprising at least two isocyanate-reactive materials, the at least two isocyanate-reactive materials comprising a first isocyanate-reactive material having a weight average molecular weight of less than 2,000 and a second isocyanate-reactive material having a weight average molecular weight of 2,000 or more; an isocyanate-functional component; an optional reactive emulsifying compound; and an optional chain extending agent. The adhesives, which are preferably pressure-sensitive adhesives, can be prepared from 100% solids, waterborne or solventborne systems.
Claims35
A polyurethane-based pressure-sensitive adhesive prepared from a waterborne system, the adhesive comprising the reaction product of:
- an isocyanate-reactive component comprising at least two isocyanate-reactive materials, the at least two isocyanate-reactive materials comprising:
- a first isocyanate-reactive material comprising a polyol and having a weight average molecular weight of less than 2,000, and
- a second isocyanate-reactive material comprising a polyol and having a weight average molecular weight of 2,000 or more;
- wherein the second isocyanate-reactive material comprises a majority of the isocyanate-reactive component based on total weight of the isocyanate-reactive component;
- an isocyanate-functional component;
- an optional reactive emulsifying compound;
- and
- an optional chain extending agent.
A method of preparing a polyurethane-based pressure-sensitive adhesive comprising the steps of:
- providing an isocyanate-reactive component comprising at least two isocyanate-reactive materials, a first isocyanate-reactive material comprising a polyol and having a weight average molecular weight of less than 2,000 and a second isocyanate-reactive material comprising a polyol and having a weight average molecular weight of 2,000 or more, wherein the second isocyanate-reactive material comprises a majority of the isocyanate-reactive component based on total weight of the isocyanate-reactive component;
- providing an isocyanate-functional component;
- optionally providing a reactive emulsifying compound;
- allowing the isocyanate-reactive component, the isocyanate-functional component, and the optional reactive emulsifying compound to react to form a polyurethrane prepolymer;
- and
- chain extending the polyurethane prepolymer.
A polyurethane-based pressure-sensitive adhesive dispersion comprising the reaction product of:
- an isocyanate-reactive component comprising at least two isocyanate-reactive materials, the at least two isocyanate-reactive materials comprising:
- a first isocyanate-reactive material comprising a polyol and having a weight average molecular weight of less than 2,000, and
- a second isocyanate-reactive material comprising a polyol and having a weight average molecular weight of 2,000 or more;
- wherein the second isocyanate-reactive material comprises a majority of the isocyanate-reactive component based on total weight of the isocyanate-reactive component;
- an isocyanate-functional component;
- an optional reactive emulsifying compound;
- and
- an optional chain extending agent,
- wherein the reaction product is dispersed in an aqueous dispersing medium.
A polyurethane-based pressure-sensitive adhesive solution comprising the reaction product of:
- an isocyanate-reactive component comprising at least two isocyanate-reactive materials, the at least two isocyanate-reactive materials comprising:
- a first isocyanate-reactive material comprising a polyol and having a weight average molecular weight of less than 2,000, and
- a second isocyanate-reactive material comprising a polyol and having a weight average molecular weight of 2,000 or more;
- wherein the second isocyanate-reactive material comprises a majority of the isocyanate-reactive component based on total weight of the isocyanate-reactive component;
- an isocyanate-functional component;
- an optional reactive emulsifying compound;
- and
- an optional chain extending agent,
- wherein the reaction product is solvated in a solvating medium.
A polyurethane-based adhesive prepared from a waterborne system, the adhesive comprising the reaction product of:
- an isocyanate-reactive component comprising at least two isocyanate-reactive materials, the at least two isocyanate-reactive materials comprising;
- a first isocyanate-reactive material comprising a polyol and having a weight average molecular weight of greater than 400 to less than 2,000, and
- a second isocyanate-reactive material comprising a polyol and having a weight average molecular weight of 2,000 or more;
- wherein the second isocyanate-reactive material comprises a majority of the isocyanate-reactive component based on total weight of the isocyanate-reactive component;
- an isocyanate-functional component;
- an optional reactive emulsifying compound;
- and
- an optional chain extending agent.
Dependencies are inferred from the claim text.