A process for the preparation of a copper phthalocyanine pigment which comprises adding a dry ground mixture of crude copper phthalocyanine containing 0.1 to 20% by weight of a crystal growth inhibitor to a 50 to 90% by weight aqueous solution of sulfuric acid to obtain a sulfuric acid slurry of the dry ground mixture, adding water to the slurry to form a precipitate and recovering it to obtain pigment grade copper phthalocyanine. The copper phthalocyanine pigment prepared according to the present invention is usable in coating materials, inks or plastics.

Claims

11 · 2 independent · depth 2

11 granted claims

›1.independentA process for the preparation of a copper phthalocyanine pigment having an .alpha.-polymorph and free of .beta.-polymorph, which comprises the steps o…+5

›3.↳ 1A process for the preparation of copper phthalocyanine pigment as set forth in claim 1, wherein said dry ground mixture is prepared either by dry grin…d2

›5.↳ 1A process for the preparation of a copper phthalocyanine pigment as set forth in claim 1, wherein the .beta. polymorph content of the dry ground mixtu…d2

›7.↳ 1A process for the preparation of a copper phthalocyanine pigment as set forth in claim 1, wherein pigmentation comprises adding one part of said dry g…d2

›9.↳ 1A process for the preparation of a copper phthalocyanine pigment as set forth in claim 1, wherein in step 1 pigmentation comprises adding one part of …d2

›10.↳ 1A process for the preparation of a copper phthalocyanine pigment as set forth in claim 1, wherein pigmentation involves any of the following steps (a)…d2

›2.independentA process for the preparation of a copper phthalocyanine pigment as set forth in claim 24, wherein said crude copper phthalocyanine is one containing …+4

›4.↳ 2A process for the preparation of a copper phthalocyanine pigment as set forth in claim 2, wherein said dry ground mixture is prepared either by dry gr…d2

›6.↳ 2A process for the preparation of a copper phthalocyanine pigment as set forth in claim 2, wherein the .beta. polymorph content of the dry ground mixtu…d2

›8.↳ 2A process for the preparation of a copper phthalocyanine pigment as set forth in claim 2, wherein pigmentation comprises adding one part of said dry g…d2

›11.↳ 2A process for the preparation of a copper phthalocyanine pigment as set forth in claim 2, wherein pigmentation involves any of the following steps (a)…d2

Classifications

14 codes

USPC · US Patent Classification

540/123540/141540/138540/127540/124540/132540/133540/122540/140540/134540/136540/137540/135540/131

Claim changes

Soon

Coming soonHow the claims changed between publication and grant

See which claims were amended, added or cancelled during examination, with every added and removed word marked.

AmendedAddedCancelledUnchanged

The published claims of this patent are not paired with the granted ones in what we hold.

File wrapper

Pendency

1.4 y

526 days filing → grant

Office actions

on the grant's record

Examiner

Cecilia Shen

art unit —

Law firm

Law firm · Log in to unlock

Citations: 10 back · 0 forward

Term & fees

See the term timeline — pendency span, in-force span, the maintenance fees paid and both computed expiry dates.

Validity challenges

See the validity challenges on record — reexaminations, IPRs and PGRs, with their institution decisions and outcomes.

Citations

See every patent this one cites and every patent that cites it back — publication, assignee, and how each one was found.