| US 7,547,373 B2 | ||
| Two-part epoxy adhesives with improved flexibility and process for making and using same | ||
| Zakar Raffi Hachikian, Belmont, Mass. (US) | ||
| Assigned to Illinois Tool Works, Inc., Glenview, Ill. (US) | ||
| Filed on Sep. 11, 2003, as Appl. No. 10/659,805. | ||
| Application 10/659805 is a continuation in part of application No. 10/269800, filed on Oct. 14, 2002, abandoned. | ||
| Prior Publication US 2004/0069405 A1, Apr. 15, 2004 | ||
| Int. Cl. C09J 163/00 (2006.01); C08L 63/00 (2006.01); B32B 27/38 (2006.01) | ||
| U.S. Cl. 156—330 [523/400; 525/523; 525/524; 428/413] | 49 Claims |
| 40. A process of adhering at least two substrate surfaces to each other comprising:
intercalating between said surfaces an adhesive comprising a reactive mixture of:
a) a resin component comprising a mixture of epoxy resin, and internally flexible epoxy resin, and
b) a hardener component consisting essentially of a mixture by weight of:
30-80% flexibilizer, wherein said flexibilizer is selected from amine terminated butadiene acrylonitrile adducts or carboxyl
terminated butadiene acrylonitrile adducts,
5-45% unmodified aliphatic amine, wherein said unmodified aliphatic amine comprises an unmodified glycol ether base aliphatic
amine,
0-15% modified aliphatic amine, wherein said modified aliphatic amine comprises an AEP base modified amine,
0-15% unmodified or modified polyamide,
1-10% accelerator, wherein said accelerator is a tertiary amine accelerator, and
optionally 5-20% plasticizer/accelerator that acts as both a plasticizer and an accelerator; and
allowing said adhesive to cure,
wherein said reactive mixture has an initial cure time of less than 3 hours and a complete cure time of approximately 24 hours;
whereby said cured adhesive has a tensile elongation at room temperature of greater than 30%, and
wherein said resin component is free of nonylphenol and said hardener component is free of nonylphenol.
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