C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
400/106, 402/274
C08G 59/62 (2006.01) C04B 41/48 (2006.01) C04B 41/63 (2006.01) C08G 59/06 (2006.01) C08G 59/18 (2006.01) C08G 59/50 (2006.01) C08G 59/68 (2006.01) C08L 63/00 (2006.01) C08L 63/02 (2006.01)
Patent
CA 1132750
ABSTRACT OF THE DISCLOSURE An epoxy resin composition which is useful for repairing concrete surfaces having an epoxy resin combined with a curing agent comprised of polyamines and phenolic accellerators. In one embodiment, the epoxy resin is conditioned with a resin modifier comprised of glycidylethers and phenolic and phosphite accellerators prior to being combined with the curing agent. The method for making the curing agent includes a first stage in which an aliphatic polyamine is combined with Bisphenol A and heated to 125°C for one hour and allowed to cool to room temperature and a second stage in which a second polyamine and an accellerator is added to the product of the first stage. In one embodi- ment of the method for preparing the curing agent, phenol is added to the mixture of the first stage when the mixture has cooled to 65°C. In another embodiment, butyl glycidyl- ether is added as the first step in the second stage to the product of the first stage prior to the addition of the second polyamine and the accellerator.
312238
Borden Ladner Gervais Llp
Dimmick Floyd E.
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