JULIE YANG
Broker in Lexington, MA
License number
Massachusetts 66518
Issued Date
Jul 1, 1985
Expiration Date
Jun 10, 1990
Type
Salesperson
Address
Address
Lexington, MA 02421
Professional information
Low Temperature Expandable Vermiculite And Intumescent Sheet Material Containing Same
US Patent:
5116537, May 26, 1992
Filed:
Jul 23, 1991
Appl. No.:
7/734657
Inventors:
Julie C. Yang - Lexington MA
Charles I. Sanders - Brookline MA
Charles I. Sanders - Brookline MA
Assignee:
W. R. Grace & Co.-Conn. - New York NY
International Classification:
C04B 1420, C04B 1414
US Classification:
252378R
Abstract:
A method of decreasing the expansion temperature and improving the expansion characteristics of vermiculite ore comprising subjecting vermiculite ore containing interlamellar cations to a potassium nitrate solution for a time interval sufficient to ion-exchange interlamellar cations within said ore with potassium ions. Subsequent to this ion exchange the low temperature expandable vermiculite may be expanded by heating in an oven, or incorporated in an intumescent material and heat expanded in situ, or expanded by other heating means. An intumescent sheet is provided which may be used for mounting automotive catalytic converter monoliths comprising an unexpanded vermiculite produced by the method of the invention; an inorganic fibrous material; and a binder.
Low Temperature Expandable Vermiculite And Intumescent Sheet Material Containing Same
US Patent:
5079280, Jan 7, 1992
Filed:
Nov 15, 1989
Appl. No.:
7/436584
Inventors:
Julie C. Yang - Lexington MA
Charles I. Sanders - Brookline MA
Charles I. Sanders - Brookline MA
Assignee:
W. R. Grace & Co.-Conn. - New York NY
International Classification:
C08K 2114
US Classification:
523179
Abstract:
A method of decreasing the expansion temperature and improving the expansion characteristics of vermiculite ore comprising subjecting vermiculite ore containing interlamellar cations to a potassium nitrate solution for a time interval sufficient to ion-exchange interlamellar cations within said ore with potassium ions. Subsequent to this ion exchange the low temperature expandable vermiculite may be expanded by heating in an oven, or incorporated in an intumescent material and heat expanded in situ, or expanded by other heating means. An intumescent sheet is provided which may be used for mounting automotive catalytic converter monoliths comprising an unexpanded vermiculite produced by the method of the invention; an inorganic fibrous material; and a binder.
Method For The Preparation Of Fibrous Insoluble Calcium Sulfate Anhydrite
US Patent:
4029512, Jun 14, 1977
Filed:
Aug 5, 1974
Appl. No.:
5/494429
Inventors:
Karlis L. Jaunarajs - Denver CO
Julie C. Yang - Lexington MA
Julie C. Yang - Lexington MA
Assignee:
Johns-Manville Corporation - Denver CO
International Classification:
C04B 1100
US Classification:
106109
Abstract:
A process is described for the formation of fibrous insoluble calcium sulfate anhydrite, the fibers thereof having specified dimensions. A dilute aqueous suspension of gypsum and, if desired, a crystal habit modifier suitable for the formation of fibrous calcium sulfate hemihydrate, is first formed. The gypsum in this suspension is then converted to the fibrous hemihydrate by reaction in the presence of saturated steam at 120. degree. C to 155. degree. C for 0. 5 to 2. 5 hours, thereby forming fibrous calcium sulfate hemihydrate of the desired dimensions. The fibrous hemihydrate is thereafter calcined at 500. degree. C to 750. degree. C for 0. 5 to 3. 0 hours to convert the fibrous hemihydrate to fibrous insoluble calcium sulfate anhydrite having substantially the same crystalline shape and dimensions.
Vermiculite Dispersions And Method Of Preparing Same
US Patent:
4655842, Apr 7, 1987
Filed:
Aug 12, 1985
Appl. No.:
6/764910
Inventors:
Chia-Chih Ou - Lexington MA
Julie C. Yang - Lexington MA
Julie C. Yang - Lexington MA
Assignee:
W. R. Grace & Co. - Cambridge MA
International Classification:
C04B 1400
US Classification:
106288B
Abstract:
Stable vermiculite dispersions which are substantially free of settling and a method of preparing same are provided. The dispersions are obtained by treating the vermiculite platelets of which the dispersion is comprised with citrate anion. The citrate anion functions as a swelling agent for the vermiculite and enhances the rate and extent of swelling in an aqueous medium. The swollen vermiculite is delaminated by shearing to provide the inventive dispersions, which comprise a suspension of the delaminated platelets and citrate anion.
Method For The Preparation Of Fibrous Calcium Sulfate Hemihydrate
US Patent:
3977890, Aug 31, 1976
Filed:
Aug 5, 1974
Appl. No.:
5/494425
Inventors:
Karlis L. Jaunarajs - Denver CO
Julie C. Yang - Lexington MA
Julie C. Yang - Lexington MA
Assignee:
Johns-Manville Corporation - Denver CO
International Classification:
C04B 1100
US Classification:
106109
Abstract:
A process is described for the formation of fibrous calcium sulfate hemihydrate, the fibers thereof having specified dimensions, wherein a dilute aqueous suspension of gypsum and, if desired, a crystal habit modifier is first formed. The gypsum in the suspension is then converted into fibrous hemihydrate by reaction in the presence of saturated steam at 120. degree. to 155. degree. C for 0. 5 to 2. 5 hours.