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US 5,907,012 AGranted
Water-based polyurethane-urea laminating adhesives and primers
AssigneeH.B. Fuller Licensing & Financing, Inc.
InventorsPeter A. Voss, Thomas E. Rolando
Life of this patent
Estimating the term…
Abstract
Water-based polyurethane-urea polymers having reduced migratory contaminants. The polymers are useful laminating adhesives and primers for flexible packaging having indirect food contact.
Claims22
A water-based polyurethane-urea laminating adhesive and primer composition comprising the reaction product of
- a) at least one water dispersible NCO-terminated polyurethane prepolymer comprising the reaction product of
- i) at least one polymeric polyol component,
- ii) at least one dihydroxy carboxylic acid which is neutralized with a tertiary amine;
- iii) at least one diisocyanate;
- with
- b) at least one water soluble monoamine chain terminator;
- c) at least one water soluble polyamine chain extender;
- and
- d) at least one water dispersible polyfunctional crosslinking agent;
- wherein component (b) is added prior to component (c) such that said composition is substantially free of amine extractables after drying on a coated substrate.
7 more elements
A water-based polyurethane-urea laminating adhesive and primer composition prepared by a process comprising:
- a) formation of at least one water dispersible NCO-terminated polyurethane prepolymer comprising the reaction product of;
- i) at least one polymeric polyol component;
- ii) at least one dihydroxy carboxylic acid which is neutralized with a tertiary amine;
- and
- iii) at least one diisocyanate;
- b) dispersing the isocyanate terminated polyurethane prepolymer in water;
- c) chain terminating with at least one water soluble monoamine chain terminator;
- d) chain extending with at least one water soluble polyamine chain extender;
- and
- e) adding at least one water dispersible polyfunctional crosslinking agent immediately prior to the laminating process;
- such that the resulting composition is substantially free of amine extractables after drying on a coated substrate when component (c) is added prior to component (d).
8 more elements
Dependencies are inferred from the claim text.