Bonding method for water-based formulations having enhanced characteristics
AssigneeH. B. Fuller Licensing & Financing, Inc.
InventorsMike Maksymkiw, Gary Haider, Michael Dochniak, Leonard Jannusch, Paul Wade
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Abstract
Adhesive formulations are blends of aqueous polymer dispersions and a hydrophobic plasticizer. The blended dispersed polymers include at least one hard sulfonated polyester urethane, at least one soft non-sulfonated polyester urethane, and at least one polar non-polyurethane water-based polymer or copolymer. A high molecular weight elastomeric non-sulfonated polyurethane polymer and a crosslinker are optional further components in the blend. The formulations are useful as non-heat activating, one-component adhesives which generate excellent green strength, water and heat resistant bonds.
Claims4
A method for bonding substrates comprising:
- a) coating an aqueous polyurethane based adhesive formulation on at least one substrate, said formulation comprising:
- i) at least one hydrophobic plasticizer and a blended mixture of dispersed polymers, the blended mixture comprising
- 1) at least one hard sulfonated polyester urethane;
- 2) at least one soft non-sulfonated polyester urethane;
- and
- 3) at least one polar non-polyurethane water-based polymer;
- b) drying the coated substrate at ambient room temperature;
- and
- c) combining said coated substrate with a second substrate at ambient room temperature using pressure.
A method for bonding substrates comprising:
- a) coating an aqueous polyurethane based adhesive formulation on at least one substrate, wherein said formulation comprises:
- i) at least one hydrophobic plasticizer;
- ii) a blended mixture of dispersed polymers comprising:
- 1) at least one hard sulfonated polyester based polyurethane-urea polymer characterized as having a shear storage modulus (G′) in a range from about 109 dynes/cm2 to about 1010 dynes/cm2 at 25° C. and 10 radian/sec;
- 2) at least one soft non-sulfonated polyester based polyurethane-urea polymer characterized as having a shear storage modulus (G′) in a range from about 106 dynes/cm2 to about 108 dynes/cm2 at 25° C. and 10 radian/sec;
- 3) at least one aqueous non-polyurethane based polymer;
- and
- 4) optionally, at least one water dispersible polyfunctional crosslinking agent selected from the group consisting of aziridines, isocyanates, melamine-formaldehyde resins, epoxies, oxazolines and carbodiimides;
- b) drying the coated substrate at ambient room temperature;
- and
- c) combining said coated substrate with a second substrate at ambient room temperature using pressure.
Dependencies are inferred from the claim text.