C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/262
C08G 59/40 (2006.01) C08G 18/50 (2006.01) C08G 65/333 (2006.01) C08G 65/334 (2006.01) C08G 71/02 (2006.01) C08G 75/12 (2006.01) C08L 63/00 (2006.01)
Patent
CA 1069248
POLYETHER THIOUREA EPOXY CURING AGENTS (D#75,024-2-F) ABSTRACT OF THE DISCLOSURE An improved curable epoxy resin composition of a vicinalpolyepoxide and an effective amount of a novel poly- ether thiourea curing agent is disclosed. The improved curable epoxy resins which are useful as coatings, castings, sealants, and adhesives show improved tensile shear strength, flexural strength, and ultimate elongation. The novel poly- ether thiourea curing agents of the instant invention are characterized by terminal primary amino groups and are formed by reaction of polyoxyalkylenepolyamines with thiourea, thiourea forming compounds or carbon disulfide. A preferred curing agent includes a mixture of a novel polyether thiourea formed by reaction of a polyoxy- propylenepolyamine having a molecular weight of from about 200-2000 and an effective amount of carbon disulfide; and another known epoxy resin curing agent such as a polyoxy- alkylenepolyamine in ratios of from about 5:1 to 1:5 by weight. I
247249
Schulze Heinz
Waddill Harold G.
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