Henkel Corporation

Sika Corporation USA

Reichhold Chemicals

Stuart J Hartman

Reuben H Grinstein

Grannis S Johnson

Michael C Coddington

Raymond P Dallago

Norman Blank

David C Elmendorf

Dorey Lum

Robert E Schaefer

An epoxy sealer/healer formulation for sealing and strengthening cracked concrete comprising an epoxy resin, an amine and a dialkylene triamine-alkylene oxide adduct, where the formulation provides a modulus and/or compressive strength at least that of uncracked concrete and effective for penetrating a concrete crack at a rate of at least 10 mm/min for a crack 0.5 mm wide when applied by gravity feed. The epoxy sealer/healer preferably has a viscosity of less than 100 centipoise and a tack-free time of less than 12 hours. The epoxy sealer/healer is advantageous in being able to bond to moist concrete surfaces. A method of using the epoxy sealer/healer for sealing and restoring the strength of cracked concrete is also set forth.

Ultra-low viscosity epoxy sealer/healer

Polythiols prepared by the reaction of hydrogen sulfide or organic dithiols with polyglycidyl substituted amines have been found to be outstanding curing agents for epoxy resins. Epoxy resins cured with these polythiols are characterized by not only improved gel times, but also improved cure rates, better heat resistance and greater resistance to absorption of water. A useful polythiol is the reaction product of N,N,N',N'-tetraglycidyl-m-xylylenediamine with hydrogen sulfide.

Polythiols and use as epoxy resin curing agents

Curable resin compositions comprising a blend of an epoxy resin, a polyurethane resin which comprises the reaction product of (A) a polyisocyanate, (B) a polyester resin and (C) a dihydric alcohol, and a standard epoxy resin curing agent. These resinous compositions, when cured, retain excellent resilience and exhibit outstanding adhesion. They are especially useful for bonding vinyl materials.

Urethane additive to a standard epoxy resin to improve adhesion to vinyl

Growing community of inventors

Livingston, NJ, United States of America

Stuart J Hartman