公开(公告)号：US10081704B2

公开(公告)日：2018-09-25

申请号：US15077071

申请日：2016-03-22

Applicant: EVONIK DEGUSSA GMBH

Inventor： Pritesh G. Patel ,  Judith Dolores Espinoza Perez ,  Gauri Sankar Lal ,  Jared Denis Bender ,  Edze Jan Tijsma

IPC: C08L63/00 ,  C08G59/40 ,  C08G71/02 ,  C08G18/50 ,  C08G18/38 ,  C08G59/24 ,  C08G59/56 ,  C09J163/00 ,  C08L75/02

CPC classification number: C08G59/4021 ,  C08G18/3829 ,  C08G18/5042 ,  C08G59/245 ,  C08G59/56 ,  C08G71/02 ,  C08L63/00 ,  C08L75/02 ,  C09J163/00

Abstract: The disclosure relates to at least one partially reacted product of an isocyanate and an amine (e.g., a reaction product comprising at least one adducted compound). The reaction product comprises polyurea oligomers. The reaction product can be combined with at least one amine in order to formulate a curing agent for epoxy resins wherein the cured epoxy resin has enhanced fracture toughness. The at least partially reacted product does not increase the viscosity of the curing agent and is at least partially soluble in the amine component of the curing agent.

公开(公告)号：US09862798B2

公开(公告)日：2018-01-09

申请号：US14041927

申请日：2013-09-30

Applicant: EVONIK DEGUSSA GMBH

Inventor： Shiying Zheng ,  Pritesh G. Patel ,  Gamini Ananda Vedage ,  Edze Jan Tijsma ,  Gauri Sankar Lal

IPC: C08G59/60 ,  C08L63/00 ,  C08G59/46 ,  C08G59/56

CPC classification number: C08G59/60 ,  C08G59/46 ,  C08G59/56 ,  C08L63/00

Abstract: The present disclosure provides a liquid curing agent composition comprising at least 50% by weight of a polyamine and 0.2% to 10% by weight of dicyandiamide, the amine/epoxy composition and the product from the cured amine/epoxy composition.

公开(公告)号：US10035874B2

公开(公告)日：2018-07-31

申请号：US14797378

申请日：2015-07-13

Applicant: EVONIK DEGUSSA GMBH

Inventor： Gauri Sankar Lal ,  Stephen Michael Boyce ,  Dilipkumar Nandlal Shah ,  Pritesh G. Patel

IPC: C08G59/50 ,  C08G59/42 ,  C08G59/22 ,  F16L55/162 ,  B05D3/02 ,  C09D163/00 ,  C08G59/24 ,  B05D7/22

CPC classification number: C08G59/506 ,  B05D3/0254 ,  B05D7/225 ,  C08G59/22 ,  C08G59/245 ,  C08G59/4207 ,  C08G59/5026 ,  C09D163/00 ,  F16L55/162

Abstract: An epoxide based composition that can be cured at a temperature of less than about 70 C is disclosed. The composition is a liquid at ambient conditions and, therefore, can be used to rehabilitate the interior surfaces of pipelines. The epoxide-based composition comprises at least one epoxide component (component A) and at least one curing agent component (component B) wherein (A) the epoxide component comprises a phenyl glycidyl ether polyepoxide; and (B) the curing agent component comprises a mixture of two salt compounds formed, respectively, from an N-alkanol piperidine and a carboxylic acid bearing 7-12 carbon atoms, and N-cyclohexyl-N,N-dialkyl amine and a carboxylic acid bearing 7-12 carbon atoms.

公开(公告)号：US20180171067A1

公开(公告)日：2018-06-21

申请号：US15670329

申请日：2017-08-07

Applicant: EVONIK DEGUSSA GMBH

Inventor： Pritesh G. Patel ,  Gauri Sankar Lal ,  Douglas M. La Comare

IPC: C08G59/50 ,  C08G59/64 ,  C08J5/04

Abstract: The present invention relates to an amine-based curing agent comprising at least 1% by weight of at least one tertiary amine and, optionally, primary and/or secondary amines. The tertiary amine is preferably an N-substituted piperidine tertiary amine and, more preferably, N-hydroxyethyl piperidine (NHEP). The present invention also relates to an epoxy resin composition formed using this amine-based curing agent and a method of making the epoxy resin composition. These tertiary amines enhance desirable properties of epoxy resin compositions without the negative impact on mechanical properties in the cured product normally seen with tertiary amine-based curing agents.