EP0165647A2
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Process for preparation of synthetic crystalline zinc silicate mineral
Assignee: Mizusawa Industrial Chemicals Ltd
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Filing: 1985-06-21
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Granted: —
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Expires: 2005-06-21
Abstract
Abstract A crystalline zinc silicate mineral of the sauconite, hemimorphite or willemite type is prepared by subjecting an acid-treated product of a clay mineral and an oxide or hydroxide of zine or a compound capable of forming this oxide or hydroxide under reaction conditions to a hydrothermal treatment. This crystalline zine silicate mineral has a fine and uniform particle size and is excellent in the pigmenting characteristics.
Inventors
- 👤 Koichi Usui
- 👤 Teiji Sato
- 👤 Masanori Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 06:36
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; B41M5/1555; C; C01; C01B; C01B33/00; C01B33/20; C08; C08K; C08K3/00; C08K3/34
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
46 words
A process for the preparation of a synthetic crystalline zinc silicate mineral, which comprises subjecting an acid-treated product of a clay mineral and an oxide or hydroxide or zinc or a compound capable of forming said oxide or hydroxide under reaction conditions to a hydrothermal treatment.
Claim 2
Dependent Claim
46 words
A process for the preparation of a synthetic crystalline zinc silicate mineral, which comprises subjecting an acid-treated product of a clay mineral and an oxide or hydroxide or zinc or a compound capable of forming said oxide or hydroxide under reaction conditions to a hydrothermal treatment.
Claim 3
Dependent Claim
18 words
A process according to claim l, wherein the zinc silicate mineral is zinc silicate of the sauconite type.
Claim 4
Dependent Claim
18 words
A process according to claim 1, wherein the zinc silicate mineral is zinc silicate of the hemimorphite type.
Claim 5
Dependent Claim
18 words
A process according to claim 1, wherein the zinc silicate mineral is zinc silicate of the willemite type.
Claim 6
Dependent Claim
33 words
A process according to claim 1, wherein the clay mineral is at least one member selected from clay minerals of the smectite group, clay minerals of the montmorillonite group, beidellite, saponite and nontronite.
Claim 7
Dependent Claim
60 words
A process according to claim 1, wherein the acid treatment of the clay mineral is carried out to such an extent that the X-ray diffraction peak of the plane index (001) of the clay mineral substantially disappears and the Aℓ 2 O 3 /SiO 2 molar ratio of the acid-treated product is within the range of from 1/11 to 1/99.
Claim 8
Dependent Claim
25 words
A process according to claim 6, wherein the acid treatment of the clay mineral is carried.out at 60 to 300°C for 10 to 600 minutes.
Claim 9
Dependent Claim
66 words
A process according to claim 1, wherein before the hydrothermal treatment, the particle size of the acid-treated product of the clay mineral is adjusted so that particles having a particle size smaller than 5µ occupy at least 20 % by weight of the total particles and particles having a particle size larger than 20 p occupy less than 30 % by weight of the total particles.
Claim 10
Dependent Claim
17 words
A process according to claim 2, wherein the hydrothermal treatment is carried out at 130 to 170°C.
Claim 11
Dependent Claim
17 words
A process according to claim 3, wherein the hydrothermal treatment is carried out at 150 to 250°C.
Claim 12
Dependent Claim
19 words
A process according to claim 4, wherein the hydrothermal treatment is carried out at a temperature higher than 200°C.
Claim 13
Dependent Claim
34 words
A process according to claim 1, wherein the acid-treated product of the clay mineral and the starting zinc component are used in substantially stoichiometric amounts as SiO 2 and ZnO for the hydrothermal treatment.
Claim 14
Dependent Claim
22 words
A process according to claim 1, wherein the hydrothermal treatment is carried out under a spontaneous pressure corresponding to the reaction temperature.
Claim 15
Dependent Claim
23 words
A process according to claim 13, wherein the hydrothermal treatment is carried out under a pressure of 2 to 50 kg/cm 2 gauge.
Claim 16
Dependent Claim
17 words
A process according to claim 1, wherein the hydrothermal treatment is conducted for 1 to 10 hours.
References Cited (Backward Citations)
No citation records indexed.
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