Hardeners for water-based epoxy resin systems and processes...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...

Reexamination Certificate

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Details

C428S413000, C428S417000, C525S524000

Reexamination Certificate

active

10939681

ABSTRACT:
Hardeners for water-based epoxy resin systems, the hardeners being obtainable by reacting a mixture of: (A) at least one epoxidized polyalkylene oxide selected from the group of epoxidized polyethylene oxides, epoxidized polypropylene oxides and polyethylene propylene oxides, (B) at least one epoxidized aromatic hydroxy compound selected from the group of bisphenol A epoxides and bisphenol F epoxides and (C) at least one aromatic hydroxy compound selected from the group of bisphenol A and bisphenol F, to form an intermediate product and subsequently reacting this intermediate product with a polyamine (E), are disclosed.

REFERENCES:
patent: 4608405 (1986-08-01), DeGooyer
patent: 5612394 (1997-03-01), Pfeil et al.
CAPLUS accession No. 2000:396733 and Derwent accession No. 1996-085694 for Romanian Patent No. 109,739, Braniste et al., May 30, 1995, three pages.

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