公开(公告)号：US10773954B2

公开(公告)日：2020-09-15

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: B82Y30/00 ,  B01J19/10 ,  C01B32/19 ,  C01B32/225 ,  C01B32/184 ,  B82Y40/00 ,  C01B32/182

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.

公开(公告)号：US10435837B2

公开(公告)日：2019-10-08

申请号：US14772764

申请日：2014-02-28

Applicant: DIRECTA PLUS S.P.A.

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

IPC: C08K3/04 ,  D06M11/74 ,  B82Y30/00 ,  B82Y40/00 ,  C01B32/19 ,  C01B32/194 ,  C09D7/61

Abstract: Concentrated dispersion from 5 to 50% by weight of nanoparticles of graphene in water with a lateral size from 10 to 5000 nm and thickness from 0.34 to 30 nm. The production process comprises the dispersion in water of flakes of expanded graphite and the subsequent treatment with ultrasounds at an energy level of from 100 to 2000 W for a period from 1 to 100 hours.

公开(公告)号：US20170190583A1

公开(公告)日：2017-07-06

申请号：US15313205

申请日：2015-06-16

Applicant: Directa Plus S.P.A.

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

IPC: C01B31/02 ,  C01B31/04

CPC classification number: C01B32/19 ,  B82Y30/00 ,  B82Y40/00 ,  C01B2204/04 ,  C01B2204/32 ,  C01P2004/24 ,  C01P2006/80 ,  Y10S977/734 ,  Y10S977/842

Abstract: Process for producing graphene nanoplatelets, comprising expanding flakes of intercalated graphite and collection of the same in a dispersing medium with forming of a dispersion that is subjected to exfoliation and size reduction treatment carried out by high pressure homogenization in a high shear homogenizer. A dispersion of 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.

公开(公告)号：US10457557B2

公开(公告)日：2019-10-29

申请号：US15313205

申请日：2015-06-16

Applicant: Directa Plus S.P.A.

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

IPC: C01B32/19 ,  B82Y30/00 ,  B82Y40/00

Abstract: Process for producing graphene nanoplatelets, comprising expanding flakes of intercalated graphite and collection of the same in a dispersing medium with forming of a dispersion that is subjected to exfoliation and size reduction treatment carried out by high pressure homogenization in a high shear homogenizer. A dispersion of 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.

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.