Claims
- 1. A composition of matter consisting of a phyllosilicate mineral including a superficial octahedral layer of magnesium oxide that has been processed by the steps of:
- (a) etching said mineral with an acid;
- (b) arresting such etching process when said superficial layer has been solubilized; and
- (c) subsequently reacting the etched phyllosilicate with an organo-silane.
- 2. A method for surface coating phyllosilicate mineral including a superficial octahedral layer of magnesium oxide with an organo-silane comprising the steps of:
- (a) etching the mineral with a dilute acid under reaction conditions sufficient only to solubilize said superficial octahedral layer of magnesium oxide from the mineral and expose silanol groups thereof;
- (b) arresting the aforesaid etching process;
- (c) subsequently reacting the etched mineral with organo-silane; and
- (d) recovering the resultant silane-coated mineral.
- 3. The method according to claim 2 wherein said phyllosilicate mineral is chrysotile asbestos.
- 4. The method according to claim 2 wherein the etching process is arrested by the addition of alkali to the mixture of acid and mineral to increase the pH thereof.
- 5. The method according to claim 2 wherein the etching process is arrested by physical separation of the mineral and the acid.
Parent Case Info
Related Applications
This is a division of application Ser. No. 772,380, filed Feb. 28, 1977, now U.S. Pat. No. 4,137,367 which is a continuation-in-part of our parent application Ser. No. 637,339, filed Dec. 3, 1975, abandoned, which in turn is a continuation of our parent application Ser. No. 513,984, filed Oct. 11, 1974, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (1)
Number |
Date |
Country |
566637 |
Nov 1958 |
CAX |
Divisions (1)
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Number |
Date |
Country |
Parent |
772380 |
Feb 1977 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
513984 |
Oct 1974 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
637339 |
Dec 1975 |
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