20250171665. Two-part Epox (3M INNOVATIVE PROPERTIES)

TWO-PART EPOXY ADHESIVE WITH WORKING LIFE COLOR CHANGE INDICATOR

Abstract: a two-part epoxy adhesive comprises a part a and a part b. part a comprises, based on the total weight of components a) and b): a) 99.5 to 99.99 weight percent of at least one curable epoxy resin; and b) 0.01 to 0.5 weight percent of at least one ph indicator dye exhibiting an abrupt color change from colorless to a color in the ph range of 8.0-10.6. part b comprises, based on the total weight of components c)-f): c) 89 to 97 weight percent of at least one aliphatic primary polyamine; d) 1 to 3 weight percent of at least one tris(2,4,6-dialkylaminoalkyl) phenol having from 13 to 24 carbon atoms; e) 1 to 3 weight percent of at least one aliphatic tertiary 1,3-bis(n,n-dialkylaminoalkyl) urea having from 6 to 24 carbon atoms; and f) 1 to 5 weight percent at least one of an alkali metal nitrate or an alkaline earth nitrate. the ratio of the total combined weight of components a) and b) to the total combined weight of components c)-f) is in the range 1.0 to 1.5. a reaction product thereof and a method of bonding are also disclosed.

Inventor(s): Zachary J. Thompson, Jay S. Schlechte, Charlotte C. Clark, Erin A. Suchara

CPC Classification: C09J163/00 (Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins)

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