US3928060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and method for inhibiting asbestos fiber dust
Assignee: NL Chemicals Inc
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Filing: 1973-08-13
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Granted: 1975-12-23
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Expires: 1993-08-13
Abstract
Abstract The tendency of asbestos fibers to become airborne as particles under dusting conditions is inhibited by treating them with the ester of a polyhydroxy compound and a C1 through C6 carboxylic acid or a derivative thereof.
Inventors
- 👤 Malcolm Kent Smith
- 👤 Robert Winslow White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:23
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/04; C04; C04B; C04B14/00; C04B14/38; C04B14/40; C04B20/00; C04B20/10; C04B20/1018; C04B20/1022; C04B2111/00; C04B2111/00017
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
107 words
A METHOD OF PROCESSING ASBESTOS FIBERS TO INHIBIT DUSTING OF SAID FIBERS WHICH COMPRISES CHARGING ASBESTOS FIBERS OF FROM ABOUT 1 TO ABOUT 25 MICROMETERS IN LENGTH INTO A TREATMENT ZONE, COATING SAID ASBESTOS FIBERS WITH AN EFFECTIVE AMOUNT TO INHIBIT FIBER DUSTING OF AN ANTI-DUSTING AGENT CONSISTING ESSENTIALLY OF THE PARTIALLY ESTERIFIED REACTION PRODUCT OF A POLYHYDROXY COMPOUND DERIVED FROM A C2 TO C6 ALKYNE AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF SATURATED AND UNSATURATED C1 THROUGH C6 CARBOXYLIC ACIDS AND THEIR ANHYDRIDES FOR A PREDETERMINED TIME PERIOD, AGITATING SAID FIBERS DURING SAID COATING STEP AND DRYING SAID FIBERS AT ROOM TEMPERATURE AFTER AGITATION.
Claim 2
Independent Claim
107 words
A METHOD OF PROCESSING ASBESTOS FIBERS TO INHIBIT DUSTING OF SAID FIBERS WHICH COMPRISES CHARGING ASBESTOS FIBERS OF FROM ABOUT 1 TO ABOUT 25 MICROMETERS IN LENGTH INTO A TREATMENT ZONE, COATING SAID ASBESTOS FIBERS WITH AN EFFECTIVE AMOUNT TO INHIBIT FIBER DUSTING OF AN ANTI-DUSTING AGENT CONSISTING ESSENTIALLY OF THE PARTIALLY ESTERIFIED REACTION PRODUCT OF A POLYHYDROXY COMPOUND DERIVED FROM A C2 TO C6 ALKYNE AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF SATURATED AND UNSATURATED C1 THROUGH C6 CARBOXYLIC ACIDS AND THEIR ANHYDRIDES FOR A PREDETERMINED TIME PERIOD, AGITATING SAID FIBERS DURING SAID COATING STEP AND DRYING SAID FIBERS AT ROOM TEMPERATURE AFTER AGITATION.
Claim 3
Dependent Claim
31 words
The method according to claim 1 wherein said effective amount for inhibiting dusting comprises from about 2 to about 25 parts by weight of said asbestos fibers of said anti-dusting agent.
Claim 4
Dependent Claim
21 words
The method according to claim 2 wherein said polyhydroxy compound is partially esterified up to about 80% with lower aliphatic acids.
Claim 5
Dependent Claim
33 words
The method according to claim 3 wherein said polyhydroxy compound is selected from the group consisting of ethylene, propylene and butylene glycol, glycerine, pentaerythritol, di and tri-pentaerythritol, sorbitol, dextrose, trimethylolethane, and trimethylol propane.
Claim 6
Dependent Claim
13 words
The method according to claim 3 wherein said polyhydroxy compound is trimethylol propane.
Claim 7
Dependent Claim
26 words
A method according to claim 2 wherein said acid is selected from the group consisting of formic, acetic, propionic, butyric, isobutyric, valeric, trimethylacetic and caproic acids.
Claim 8
Dependent Claim
12 words
A method according to claim 3 wherein said polyhydroxy compound is trimethylolethane.
Claim 9
Dependent Claim
13 words
A method according to claim 7 wherein said carboxylic acid is acetic acid.
Claim 10
Dependent Claim
73 words
An anti-dusting asbestos particle which comprises a chrysotile asbestos fiber coated with a composition consisting essentially of the partially esterified reaction product of an ester of a polyhydroxy derivative of a C2 - C6 alkyne and a compound selected from the group consisting of saturated and unsaturated C1 - C6 carboxylic acids and their anhydrides said fiber being from about 1 to about 25 micrometers in length and said coated particle being dry.
Claim 11
Dependent Claim
73 words
An anti-dusting asbestos particle which comprises a chrysotile asbestos fiber coated with a composition consisting essentially of the partially esterified reaction product of an ester of a polyhydroxy derivative of a C2 - C6 alkyne and a compound selected from the group consisting of saturated and unsaturated C1 - C6 carboxylic acids and their anhydrides said fiber being from about 1 to about 25 micrometers in length and said coated particle being dry.
Claim 12
Dependent Claim
36 words
An anti-dusting asbestos particle as recited in claim 9 wherein said polyhydroxy compound is selected from the group consisting of ethylene, propylene and butylene glycol, glycerine, pentaerythritol, di- and tri-pentaerythritol, sorbitol, dextrose, trimethylolethane, and trimethylol propane.
Claim 13
Dependent Claim
29 words
An anti-dusting asbestos particle as recited in claim 9 wherein said acid is selected from the group consisting of formic, acetic, propionic, butyric, isobutyric, valeric, trimethylacetic and caproic acids.
Claim 14
Dependent Claim
37 words
An anti-dusting asbestos particle as recited in claim 9 whErein said acid anhydride is selected from the group consisting of formic anhydride, acetic anhydride, propionic anhydride, butyric anhydride, isobutyric anhydride, valeric anhydride, trimethylacetic anhydride and caproic anhydride.
Claim 15
Dependent Claim
22 words
An anti-dusting asbestos particle as recited in claim 12 wherein said polyhydroxy compound is trimethylol propane and said anhydride is acetic anhydride.
Claim 16
Dependent Claim
22 words
An anti-dusting asbestos particle as recited in claim 11 wherein said polyhydroxy compound is trimethylol propane and said acid is acetic acid.
Claim 17
Dependent Claim
67 words
An anti-dusting asbestos composition comprising a plurality of finely divided asbestos fibers from about one to about 25 micrometers in length coated with an effective amount for inhibiting asbestos fiber dusting of an anti-dusting agent consisting essentially of the reaction product of a polyhydroxy compound which has been partially esterified from about 0 to about 80% with a lower aliphatic acid anhydride said coated particles being dry.
Claim 18
Dependent Claim
67 words
An anti-dusting asbestos composition comprising a plurality of finely divided asbestos fibers from about one to about 25 micrometers in length coated with an effective amount for inhibiting asbestos fiber dusting of an anti-dusting agent consisting essentially of the reaction product of a polyhydroxy compound which has been partially esterified from about 0 to about 80% with a lower aliphatic acid anhydride said coated particles being dry.
Claim 19
Dependent Claim
16 words
An anti-dusting asbestos composition as recited in claim 15 wherein said polyhydroxy compound is trimethylol propane.
Claim 20
Dependent Claim
18 words
An anti-dusting asbestos composition as recited in claim 16 wherein said lower aliphatic acid anhydride is acetic anhydride.
Claim 21
Dependent Claim
18 words
An anti-dusting asbestos composition as recited in claim 15 wherein said asbestos fibers are formed from chrysotile asbestos.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |