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US 11,802,226 B2Granted
Polyurethane adhesive film
AssigneeH.B. Fuller Company
InventorsFelix D. Mai, Brian W. Carlson
Life of this patent
Estimating the term…
Abstract
A thin self-supporting adhesive film is claimed that includes a first polyurethane and a solid surface-deactivated isocyanate.
Claims26
A self-supporting adhesive film comprising:
- a solid surface-deactivated isocyanate;
- and
- greater than 70% by weight, based on the weight of the adhesive film, of a isocyanate reactive polyurethane component having a weight average molecular weight (Mw) of no greater than about 90,000 g/mol and an enthalpy of fusion of at least about 25 J/g, the polyurethane component comprising
- a first polyurethane having a weight average molecular weight of no greater than about 90,000 g/mol and an enthalpy of fusion of at least about 25 J/g, and
- a second polyurethane different from the first polyurethane and having a weight average molecular weight of no greater than about 90,000 g/mol and an enthalpy of fusion of at least about 25 J/g, the second polyurethane differing from the first polyurethane based on a property selected from the group consisting of composition, molecular weight, enthalpy of fusion, melting peak, and combinations thereof.
2 more elements
A self-supporting adhesive film obtained from an aqueous composition, said aqueous composition comprising:
- a solid surface-deactivated isocyanate;
- and
- an isocyanate reactive polyurethane dispersion, the dried film of which has an enthalpy of fusion of at least about 25 J/g, the isocyanate reactive polyurethane dispersion comprising
- a first polyurethane having an enthalpy of fusion of at least about 25 J/g, and
- a second polyurethane different from the first polyurethane and having an enthalpy of fusion of at least about 25 J/g, the second polyurethane differing from the first polyurethane based on a property selected from the group consisting of composition, molecular weight, enthalpy of fusion, melting peak, and combinations thereof,
- the self-supporting adhesive film having a thickness of from about 1 mil to about 8 mils.
3 more elements
A self-supporting adhesive film comprising:
- a solid surface-deactivated isocyanate;
- and
- greater than 70% by weight, based on the weight of the adhesive film, of a isocyanate reactive polyurethane component having a weight average molecular weight (Mw) of no greater than about 90,000 g/mol and an enthalpy of fusion of at least about 25 J/g, the polyurethane component comprising
- a first polyurethane derived from a polyester polyol, the first polyurethane having a weight average molecular weight of no greater than about 90,000 g/mol and an enthalpy of fusion of at least about 25 J/g, and
- a second polyurethane derived from a polyester polyol, the second polyurethane being different from the first polyester polyurethane and having a weight average molecular weight of no greater than about 90,000 g/mol and an enthalpy of fusion of at least about 25 J/g, the second polyurethane differing from the first polyurethane based on a property selected from the group consisting of composition, molecular weight, enthalpy of fusion, melting peak, and combinations thereof.
2 more elements
Dependencies are inferred from the claim text.