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US 2026/0242645 A1Published application
Liquid, One Component, Moisture Curable Polyurethane for Bonding Untreated Metals
AssigneeHenkel AG & Co. KGaA
InventorsYingjie Li, Shuhui Qin
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Abstract
Disclosed is a one component, liquid, moisture curable polyurethane adhesive composition comprising a mixture including at least one isocyanate functional prepolymer; one of a) a silane compound and a tackifier or b) a silicone oligomer and optionally a tackifier; and optionally additives. The adhesive composition has enhanced bond strength to metals such as aluminum compared to currently available adhesives. The composition finds special use in panel lamination applications.
Claims18
A liquid, one component, reactive polyurethane adhesive, comprising:
- an isocyanate functional prepolymer that is a reaction product of a mixture including at least one polyisocyanate and at least one polyol;
- one of
- a) a silane and a tackifier;
- or
- b) a silicone oligomer of structure 1:
- wherein each R′ is the same or different and is, independently from one another, selected from a hydrogen atom or a hydrocarbon residue having 1 to 12 carbon atoms;
- n is an integer selected from 0-12;
- and
- optionally, a tackifier;
- wherein the isocyanate functional prepolymer is free of Si atoms;
- and optionally one or more additives.
8 more elements
A method of making a bonded reinforced composite structure, comprising:
- providing an aluminum frame having a first bonding surface;
- providing a first panel having a bonding surface;
- providing a liquid, one component, reactive polyurethane adhesive, comprising:
- an isocyanate functional prepolymer that is a reaction product of a mixture including at least one polyisocyanate and at least one polyol;
- one of
- a) a silane and a tackifier;
- or
- b) a silicone oligomer of structure 1:
- wherein each R′ is the same or different and is, independently from one another, selected from a hydrogen atom or a hydrocarbon residue having 1 to 12 carbon atoms;
- wherein the isocyanate functional prepolymer is free of Si atoms;
- and
- optionally one or more additives;
- applying the liquid adhesive on at least one bonding surface;
- disposing the first panel bonding surface in contact with the disposed adhesive and frame bonding surface to form a composite structure;
- and
- curing the adhesive to bond the first panel to the metal frame.
13 more elements
Dependencies are inferred from the claim text.