公开(公告)号：US09909015B2

公开(公告)日：2018-03-06

申请号：US14910488

申请日：2014-08-07

Applicant: DIRECTA PLUS S.p.A.

Inventor： Giulio Cesareo ,  Maria Riccardo Parrini ,  Laura Giorgia Rizzi

IPC: C09D5/18 ,  C08K3/04 ,  C09K21/06

CPC classification number: C09D5/18 ,  C08G16/0237 ,  C08K3/04 ,  C08K3/042 ,  C09D161/00 ,  C09K21/06

Abstract: A flame retardant composition comprising graphene nanoplatelets and a condensation product of a sulfonated aromatic compound with formaldehyde, wherein the w/w ratio between the graphene and the condensation product is in the range of 1:15 to 4:1. The composition may be in the form of a water dispersion applied to the surface of the article to be treated.The composition has optimal flame retardant properties even when applied in relatively modest quantities.

公开(公告)号：US20170190581A1

公开(公告)日：2017-07-06

申请号：US15313183

申请日：2015-06-16

Applicant: Directa Plus S.P.A.

Inventor： Giulio Cesareo ,  Maria Riccardo Parrini ,  Laura Giorgia Rizzi

IPC: C01B31/02 ,  B82Y30/00 ,  B82Y40/00

Abstract: Process for producing pristine graphene nanoplatelets, comprising the expansion of flakes of intercalated graphite and the collection thereof in water with formation of a dispersion in the substantial absence of surfactants, followed by an exfoliation and size reduction treatment carried out using ultrasonication of the aqueous dispersion or using high pressure homogenization thereof in a high shear homogenizer. A dispersion of pristine graphene is obtained in the form of nanoplatelets, at least 90% of which have a lateral size (x, y) from 50 to 50,000 nm and a thickness (z) from 0.34 to 50 nm, having a C/O ratio ≧100:1 and a high electrical conductivity.