Compositions: coating or plastic – Coating or plastic compositions – Proteinaceous material containing
Patent
1974-08-05
1977-06-14
Douglas, Winston A.
Compositions: coating or plastic
Coating or plastic compositions
Proteinaceous material containing
106 99, 106110, 106111, 260 37R, 260 40R, 260 4214, 260 4217, 423554, 423555, C04B 1100
Patent
active
040295125
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.
REFERENCES:
patent: 757649 (1904-04-01), Brothers
patent: 1708436 (1929-04-01), Weinstein
patent: 1746294 (1930-02-01), Tyler
patent: 3822340 (1974-07-01), Eberl et al.
patent: 3915927 (1975-10-01), Jaunarjs et al.
"Process for Making High-Strength Plaster of Paris," James J. Eberl & Alvin R. Ingram, Industrial & Engineering Chemistry, vol. 41, No. 5, pp. 1061-1065.
Jaunarajs Karlis L.
Yang Julie C.
Douglas Winston A.
Johns-Manville Corporation
Kelly Joseph J.
Krone Robert M.
McClain James W.
LandOfFree
Method for the preparation of fibrous insoluble calcium sulfate does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for the preparation of fibrous insoluble calcium sulfate , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for the preparation of fibrous insoluble calcium sulfate will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-8217