GB1397442A - Stabilization of lead chromate pigments - Google Patents

Stabilization of lead chromate pigments

Info

Publication number
GB1397442A
GB1397442A GB2449872A GB2449872A GB1397442A GB 1397442 A GB1397442 A GB 1397442A GB 2449872 A GB2449872 A GB 2449872A GB 2449872 A GB2449872 A GB 2449872A GB 1397442 A GB1397442 A GB 1397442A
Authority
GB
United Kingdom
Prior art keywords
salt
phosphoric acid
pigment
lead
solution
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2449872A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoechst AG
Original Assignee
Hoechst AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19712127279 external-priority patent/DE2127279C3/en
Application filed by Hoechst AG filed Critical Hoechst AG
Publication of GB1397442A publication Critical patent/GB1397442A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/14—Compounds of lead
    • C09C1/20—Lead chromate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/0003—Compounds of molybdenum
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/14—Compounds of lead

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

1397442 Stabilized chrome yellow HOECHST AG 24 May 1972 [2 June 1971] 24498/72 Heading C1A [Also in Division C4] Orthorhombic chrome yellow or tetragonal molybdate red of stable crystal phase are produced by mixing a solution of a lead salt with a soluble metal salt which produces an insoluble phosphate on reaction with phosphoric acid or a soluble phosphoric acid salt, precipitating the pigment by adding a chromate with or without a sulphate and molybdate in addition, adding phosphoric acid or a soluble phosphoric acid salt in an amount equivalent to the soluble metal salt to the pigment suspension obtained, and adjusting the suspension to neutral. In a modification an excess of the lead salt is used instead of the mixture of lead salt and soluble metal salt. Preferably the soluble metal salt is one of Zn, Mg of Ce, and the amount of metal phosphate applied by precipitation is 0À1-8% by wt. of the chrome yellow or molybdate red. In Example 1 aqueous solutions of lead nitrate, zinc oxide and nitric acid are mixed, and an aqueous solution of sodium bichromate and ammonium sulphate is added thereto. Aqueous soda is added followed by phosphoric acid, and further soda to adjust the pH to 7À5, the pigment then being filter washed and dried. The zinc oxide can be replaced magnesium oxide cerium chloride or merely a larger amount of lead nitrate. In Example 2 molybdate red is prepared using an excess of lead nitrate and when the desired shade of the tetragonal phase is reached a solution of Na 2 HPO 4 .12H 2 O is added the pigment then being neutralized and washed. The pigment suspension produced could then be treated with sodium silicate and an antimony and solution in a known method.
GB2449872A 1971-06-02 1972-05-24 Stabilization of lead chromate pigments Expired GB1397442A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712127279 DE2127279C3 (en) 1971-06-02 Process for phase stabilization of chrome yellow and molybdate red pigments

Publications (1)

Publication Number Publication Date
GB1397442A true GB1397442A (en) 1975-06-11

Family

ID=5809578

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2449872A Expired GB1397442A (en) 1971-06-02 1972-05-24 Stabilization of lead chromate pigments

Country Status (9)

Country Link
AU (1) AU468252B2 (en)
BE (1) BE784340A (en)
BR (1) BR7203548D0 (en)
CH (1) CH562311A5 (en)
DK (1) DK131637C (en)
FR (1) FR2140194B1 (en)
GB (1) GB1397442A (en)
IT (1) IT956085B (en)
NL (1) NL7207149A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1547570A (en) * 1975-11-26 1979-06-20 Ici Ltd Chrome pigments
GB1568710A (en) * 1976-08-09 1980-06-04 Ici Ltd Chrome pigments

Also Published As

Publication number Publication date
AU4290772A (en) 1973-12-06
DE2127279B2 (en) 1976-02-26
FR2140194A1 (en) 1973-01-12
BE784340A (en) 1972-12-04
NL7207149A (en) 1972-12-05
DE2127279A1 (en) 1972-12-14
CH562311A5 (en) 1975-05-30
FR2140194B1 (en) 1977-12-23
DK131637C (en) 1976-01-12
IT956085B (en) 1973-10-10
AU468252B2 (en) 1976-01-08
DK131637B (en) 1975-08-11
BR7203548D0 (en) 1973-05-24

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee