US3630012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asbestos fabricating process and products thereof
Assignee: REX ASBESTWERKE
•
Filing: 1968-11-26
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Granted: 1971-12-28
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Expires: 1988-11-26
Abstract
Abstract A dispersion of chrysolite asbestos in water with soap as dispersion medium is given an addition of sharpening agent consisting of aluminum sulfate or other acidic soap-precipitant substance in a quantity below the threshold at which the precipitant causes coagulation of asbestos. Preferably the added quantity of sharpening agent is 20 to 80 percent of its threshold quantity. This, for example, amounts to 50-200 g. of aluminum sulfate per kg. of dry soap content in a 2 percent asbestos dispersion. The sharpening agent is added in such a manner as to prevent local or partial coagulation. This is done by first dissolving the sharpening agent in the water subsequently used for preparing the asbestos dispersion, or by dissolving the sharpening agent in water and stirring the solution into the previously prepared aqueous dispersion. The addition improves storability and extrudability of the dispersion as well as the tensile strength of the asbestos strand or yarn made therefrom.
Inventors
- 👤 Horst C G H Guertler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:27
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B20/08; D; D02; D02G; D02G3/00; D02G3/02; D02G3/16; D02G3/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
31 words
The process according to claim 1 which comprises admixing said coagulating agent to said asbestos dispersion by dissolving said agent in the water from which thereafter the asbestos dispersion is prepared.
Claim 2
Dependent Claim
31 words
The process according to claim 1 which comprises admixing said coagulating agent to said asbestos dispersion by dissolving said agent in water and slowly mixing the resulting solution into the dispersion.
Claim 3
Dependent Claim
106 words
In the process of making coherent asbestos structures, which comprises preparing a dispersion of asbestos fibers in a medium consisting essentially of water with water-soluble soap as dispersing agent, shaping the dispersion, and contacting the shaped dispersion with precipitating medium to effect coagulation of the fibers, the improvement which comprises admixing to the asbestos dispersion, prior to shaping it, a coagulating agent reactionable with the soap to effect precipitation thereof, said agent being brought into the dispersion in the form of an aqueous solution and amounting to 20 percent to 80 percent of the minimum quantity required to cause precipitation of the soap in the dispersion.
Claim 4
Dependent Claim
12 words
In the process according to claim 4, said agent being aluminum sulfate.
Claim 5
Dependent Claim
49 words
The process according to claim 4, wherein the asbestos content amounts to about 2 percent chrysolite asbestos in said dispersion, and said admixed coagulating agent is aluminum sulfate in a quantity of at least 30 percent but less than 240 grams per kg. of dry soap in the dispersion.
Claim 6
Dependent Claim
16 words
In the process according to claim 4, said coagulating agent in the dispersion being an acid.
Claim 7
Dependent Claim
20 words
The process according to claim 4, in which said coagulating agent in the dispersion is hydrochloric acid or sulfuric acid.
Claim 8
Dependent Claim
111 words
In the process of making coherent asbestos, strands which comprises passing a soap-containing aqueous dispersion of asbestos fibers through a shaping device to form a travelling strand and bringing the travelling strand of dispersion into contact with coagulating liquid, the improvement which comprises admixing to the aqueous dispersion of asbestos, prior to passing the dispersion through the shaping device, a coagulant in a quantity of at least 30 grams per kg. of dry soap in the dispersion, but less than the minimum amount required to cause coagulation of the dispersion, so that the coagulant-containing dispersion of asbestos remains noncoagulated before forming the strand and before contacting it with the coagulating liquid.
Claim 9
Dependent Claim
34 words
In the process aCcording to claim 9, said quantity of coagulant admixed to said asbestos aqueous dispersion being 20 percent to 80 percent of said minimum amount required to cause coagulation of the dispersion.
Claim 10
Dependent Claim
46 words
The process according to claim 9, in which said aqueous dispersion of asbestos contains water-soluble soap as dispersing agent, said coagulating agent admixed to said dispersion being aluminum sulfate in a quantity of about 50 grams to about 200 grams per kg. of dry soap content.
Claim 11
Dependent Claim
22 words
The process according to claim 11, wherein said quantity of aluminum sulfate is about 120 grams per kg. of dry soap content.
Claim 12
Dependent Claim
12 words
An asbestos fiber material produced by the process according to claim 9.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |