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公开(公告)号：US10773954B2
公开(公告)日：2020-09-15
申请号：US15313183
申请日：2015-06-16
申请人： Directa Plus S.P.A.
IPC分类号： B82Y30/00 , B01J19/10 , C01B32/19 , C01B32/225 , C01B32/184 , B82Y40/00 , C01B32/182
摘要： 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.
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公开(公告)号：US20230295870A1
公开(公告)日：2023-09-21
申请号：US18018612
申请日：2021-07-21
申请人： DIRECTA PLUS S.P.A.
CPC分类号： D06N3/145 , D06N3/0011 , D06N3/0036 , D06N3/0063 , D06N3/0097 , D06N2201/02 , D06N2203/068 , D06N2205/12 , D06N2211/10 , D06N2209/041 , D06N2211/28
摘要： Method for making a thermally and electrically conductive coating on natural or synthetic leather comprising the deposition of several layers based on aliphatic polyurethanes, with an intermediate layer, having a thickness from 10 to 50 μm, comprising graphene nano-platelets, wherein at least 90% has a lateral dimension (x, y) from 50 to 50000 μm and a thickness (z) from 0.34 to 50 nm, and wherein the C/O ratio is ≥100:1.
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公开(公告)号：US20230030305A1
公开(公告)日：2023-02-02
申请号：US17874747
申请日：2022-07-27
IPC分类号： C01B32/192 , H01M10/36 , H01M10/0525
摘要： Devices and methods are presented that comprise graphene platelets with controlled dimension and high carbon to oxygen ratio, and that further include a heteroatom or heteroionic species, an alkylammonium polysulfide, or both, preferably non-covalently bound to the graphene platelets. Such compositions have significantly improved conductive properties as opposed to unmodified graphene platelets and can be easily produced at mass quantities and low cost.
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公开(公告)号：US10457557B2
公开(公告)日：2019-10-29
申请号：US15313205
申请日：2015-06-16
申请人： Directa Plus S.P.A.
摘要： 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.
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公开(公告)号：US20240035690A1
公开(公告)日：2024-02-01
申请号：US18268751
申请日：2021-12-27
申请人： DIRECTA PLUS S.P.A.
CPC分类号： F24F8/108 , B01D39/14 , D06M11/74 , B01D2239/0258 , B01D2239/0407 , B01D2239/0442 , B01D2239/0464
摘要： Filter element for air conditioning unit comprising a textile substrate selected from woven fabric and nonwoven fabric, and a composition comprising graphene, in which said graphene is in the form of nano-platelets and is present in an amount from 2 to 20 g of graphene per square meter of textile substrate and is dispersed in a binding agent and applied uniformly on all said textile substrate by means of impregnation.
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公开(公告)号：US20230243089A1
公开(公告)日：2023-08-03
申请号：US17927770
申请日：2021-05-24
申请人： DIRECTA PLUS S.P.A.
CPC分类号： D06M11/74 , B01D39/083 , B01D39/1623 , B01D39/2058 , D06B3/18 , D06M16/00 , B01D2239/0442 , B01D2239/0241 , B01D2239/0258 , B01D2239/0464 , B01D2239/0618 , B01D2239/0627 , B01D2239/10 , D06M2101/20
摘要： Method of treating a textile article by impregnation with a water dispersion of graphene nano-platelets in an impregnation bath comprising also a polymeric binder and an anti-migration and wetting agent. Graphene is fixed in the textile article to improve its thermal and electrical conductivity, as well as its filtering power and germ-blocking properties.
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公开(公告)号：US20230225430A1
公开(公告)日：2023-07-20
申请号：US17927768
申请日：2021-05-24
申请人： DIRECTA PLUS S.P.A.
CPC分类号： A41D13/11 , B82Y30/00 , B01D71/0211 , B01D2239/0442 , B01D2239/0241
摘要： Textile article comprising a textile substrate to which graphene is applied in an amount from 0.5 to 20 g of graphene per square meter of textile substrate, wherein said graphene is dispersed in a polymeric binder and forms a thermal circuit heatable by exposure to electromagnetic radiation. There is also described a filter comprising said textile article, for example a face mask for personal health protection.
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公开(公告)号：US10435837B2
公开(公告)日：2019-10-08
申请号：US14772764
申请日：2014-02-28
申请人： DIRECTA PLUS S.P.A.
摘要： 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.
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公开(公告)号：US20210156078A1
公开(公告)日：2021-05-27
申请号：US16977173
申请日：2019-04-17
申请人： DIRECTA PLUS S.P.A.
IPC分类号： D06M11/74 , D06M23/16 , C01B32/182
摘要： Textile article with a pattern comprising graphene, defining a surface with empty portions and full portions, with a percentage of coverage from 10 to 70% of the surface defined by the pattern, so as to forma thermal circuit for optimal management of the heat absorbed and of the breathability of the article, and the process for its preparation.
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公开(公告)号：US10913666B2
公开(公告)日：2021-02-09
申请号：US16324831
申请日：2017-08-09
申请人： Directa Plus S.p.A.
IPC分类号： C02F1/28 , B01J20/28 , B01J20/20 , B01D17/02 , C02F1/00 , C02F101/32 , C02F103/10
摘要： Process for the treatment of water containing low quantities of hydrocarbons (as dispersed or dissolved or emulsified) by means of expanded graphite having an apparent density from 2 to less than 5 g/l, wherein said hydrocarbons are present in a quantity less than or equal to 1 g/l, a specific surface area from 50 to 100 m2/g and a carbon/oxygen ratio (C:O)≥100. The expanded graphite is mixed vigorously for a short time with the water contaminated by hydrocarbons and easily separated at the end of the treatment.
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