CERAMIC GREENSHEETS

• US 3,458,329 A
• Filed: 02/13/1963
• Issued: 07/29/1969
• Est. Priority Date: 02/13/1963
• Status: Expired due to Term

• Current Assignee: Kenneth E. Owens, Robert A. Hatch
• Original Assignee: Kenneth E. Owens, Robert A. Hatch
• Inventors: Owens, Kenneth E., Hatch, Robert A.
• Application Number:
  US04/258,298
• Time in Patent Office: 2,358 Days
• US Class Current: 428/493
• CPC Class Codes: C04B 35/00 Shaped ceramic products characterised by their composition porous ceramic products C04B38/00; ceramic articles characterised by particular shape, see the relevant classes, e.g. linings for casting ladles, tundishes, cups or the like B22D41/02; ceramic substrates for microelectronic semi-conductors H01L23/15; Ceramics compositions containing free metal bonded to carbides, diamond, oxides, borides, nitrides, silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides or sulfides other than as macroscopic reinforcing agents C22C; shaping of ceramics B28B; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products chemical preparation of powders of inorganic compounds C01; infiltration of sintered ceramic preforms with molten metal C04B41/51
• CPC Class Codes: Y10T 428/3183 Next to second layer of natural rubber
• CPC Class Codes: Y10T 428/31924 Including polyene monomers

Claims

1. A COMPOSITION OF MATTER, ADAPTED TO THE FABRICATION OF ESSENTIALLY RECRYSTALLIZED CERAMIC PRODUCTS CONSISTING ESSENTIALLY, ON A DRY WEIGHT BASIS IN PERCENT BY WEIGHT, OF SOLIDS COHERED IN COMBINATION IN THE PROPORTIONS OF:

(1) FROM ABOUT 70 TO ABOUT 92 PERCENT OF PARTICULATE NON-FIBROUS MATERIALS SMALLER IN INDIVIDUAL PARTICLE DIMENSION THAN 100 MESH CONSISTING ESSENTIALLY OF INORGANIC PARTICLES AND INCLUDING OPTIONALLY UP TO 10% OF SAID SOLIDS OF ELASTOMER LATEX PARTICLES AND (II) FROM ABOUT 30 TO ABOUT 8 PERCENT OF FIBROUS MATERIAL HAVING AN AVERAGE DIAMETER FROM ABOUT 0.2 TO ABOUT 10 MICRONS AND LENGTH UP TO ABOUT 1 CENTIMETER;

AT LEAST A PORTION OF SAID FIBROUS MATERIAL BEING 5% OR MORE BY WEIGHT OF SAID SOLIDS OF GROUND OR MACERATED CELLULOSIC FIBERS;

SAID SOLIDS BEING FURTHER CHARACTERIZED;

(A) BY HAVING A CONTENT OF WATER-INSOLUBLE ORGANIC MATERIALS OF NOT MORE THAN ABOUT 30% BY WEIGHT CONSISTING ESSENTIALLY OF AT LEAST ONE OF (A) GROUND OR MACERATED CELLULOSIC FIBERS AND (B) ELASTOMER, (B) AT LEAST ONE OF SAID SOLIDS BEING HYDRATED IN CONTACT WITH WATER, (C) THE TOTAL INORGANIC CONTENT OF SAID SOLIDS BEING ELEMENTS OF VALENCE NO GREATER THAN FOUR HAVING IONIC RADII BELOW ABOUT 0.9 ANGSTROM UNITS AND COORDINATION NUMBER TO OXYGEN OF 4 TO 6 INCLASIVE, BEING SUMMARIZED WHEN CALCULATED AS OXIDES, BY THE VOLUME DESIGNATED ABCDEFGHI IN FIGURE 2 AND (D) SAID SOLIDS CONTAINING NO MORE THAN ABOUT 3 MOLE PERCENT, CALCULATED AS THE OXIDES, OF ALKALI AND ALKALINE EARTH ELEMENTS HAVING IONIC RADII ABOVE ABOUT 0.9 ANGSTROM UNITS.

16. THE PROCESS FOR THE PRODUCTION OF A CERAMIC CONVERTIBLE WATER LAID GREENSHEET HAVING A DRY WEIGHT BASIS COMPOSITION ACCORDING TO CLAIM 4 WHICH COMPRISES THE STEPS OF (A) BLENDING TOGETHER, IN 2 TO 20 PERCENT BY WEIGHT SUSPENSION IN WATER, 5% OR MORE GROUND OR MACERATED CELLULOSIC FIBERS, INORGANIC FIBERS, NON-FIBROUS MINERAL MATERIALS AND ELASTOMERIC LATEX IN THAT SEQUENCE, WHEREBY A PREDOMINANTLY NEGATIVELY CHARGED SUSPENSION IS OBTAINED AND (B) FLOCCULATING THE SAID SUSPENSION BY ADDITION OF A CATIONIC FLOCCULATING AGENT WHEREBY A PULP OF COHESIVE FLOCS IS OBTAINED.