US3886076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perlite thermal insulation product and method of producing same
Assignee: Pamrod Inc
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Filing: 1972-12-22
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Granted: 1975-05-27
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Expires: 1992-12-22
Abstract
Abstract A compression molded, corrosion inhibiting thermal insulating product for use at temperatures up to about 1,800* F. is disclosed as comprising essentially a product formed by the mixture of about 35-52% water, about 20-32% expanded perlite, about 1.75-3.0% sodium tetraborate, about 2.5-3.0% sodium silicate, about 1.0-3.5% chopped inorganic fiber, about 0.33-2.0% silicone, and about 13.5-21.0% of a binder consisting of a metallic phosphate such as aluminum phosphate. A method of mixing constituents of the product and then compression molding the products into various shapes is also disclosed.
Inventors
- 👤 Joseph M Venable
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:35
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/34; Y; Y10; Y10S; Y10S106/00; Y10S106/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
182 words
A METHOD OF FORMING LOW DENSITY CORROSION INHIBITING THERMAL INSULATION PRODUCT COMPRISING THE STEPS OF: A. MIXING A WET PHASE LIQUID PROTECTION IN A WET PHASE MIXING ZONE BY: I) ADDING ABOUT 35-52 PERCENT WATER, II) ADDING ABOUT 0.33-2.00 PERCENT LIQUID SILICONE WATER REPELLENCY MATERIAL TO WATER, III). ADDING ABOUT 13.5-21.0 PERCENT LIQUID SILICONE WATER BINDER TO THE PRODUCT OF STEPS I) AND II), B. MIXING AND AGITATING IN DRY PHASE MIXING ZONE, ABOUT 20.5 TO 32 PERCENT EXPANDED PERLITE HAVING A BULK DENSITY FROM ABOUT 2-5 POUNDS PER CUBIC FOOT, NOT MORE THAN 6 PERCENT OF AT LEAST ONE OF SODIUM TETRABORATE AND SODIUM SILICATE, AND ABOUT 1.0-3.5 PERCENT OF AN INORGANIC FIBER, C. WETTING SUBSTANTIALLY UNIFORMLY THE PRODUCT OF STEP B) WITH THE PRODUCT OF STEP A), D. PLACING THE WETTED PRODUCT OF STEP C) IN A COMPRESSION ZONE TO FORM A DESIRED ARTICLE, AND E. CURING THE MOLDED PRODUCT OF STEP C) IN A COMPRESSION ATURE OF AT LEAST 500*F. FOR A PERIOD OF TIME SUFFICIENT TO HEAT THE MOLDED PRODUCT THROUGHOUT TO A TEMPERATURE OF AT LEAST 480*F.
Claim 2
Independent Claim
182 words
A METHOD OF FORMING LOW DENSITY CORROSION INHIBITING THERMAL INSULATION PRODUCT COMPRISING THE STEPS OF: A. MIXING A WET PHASE LIQUID PROTECTION IN A WET PHASE MIXING ZONE BY: I) ADDING ABOUT 35-52 PERCENT WATER, II) ADDING ABOUT 0.33-2.00 PERCENT LIQUID SILICONE WATER REPELLENCY MATERIAL TO WATER, III). ADDING ABOUT 13.5-21.0 PERCENT LIQUID SILICONE WATER BINDER TO THE PRODUCT OF STEPS I) AND II), B. MIXING AND AGITATING IN DRY PHASE MIXING ZONE, ABOUT 20.5 TO 32 PERCENT EXPANDED PERLITE HAVING A BULK DENSITY FROM ABOUT 2-5 POUNDS PER CUBIC FOOT, NOT MORE THAN 6 PERCENT OF AT LEAST ONE OF SODIUM TETRABORATE AND SODIUM SILICATE, AND ABOUT 1.0-3.5 PERCENT OF AN INORGANIC FIBER, C. WETTING SUBSTANTIALLY UNIFORMLY THE PRODUCT OF STEP B) WITH THE PRODUCT OF STEP A), D. PLACING THE WETTED PRODUCT OF STEP C) IN A COMPRESSION ZONE TO FORM A DESIRED ARTICLE, AND E. CURING THE MOLDED PRODUCT OF STEP C) IN A COMPRESSION ATURE OF AT LEAST 500*F. FOR A PERIOD OF TIME SUFFICIENT TO HEAT THE MOLDED PRODUCT THROUGHOUT TO A TEMPERATURE OF AT LEAST 480*F.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein step b) about 1.75- 3.0 percent sodium tetraborate is added in the dry phase mixture.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein step b) about 2.5-3.0 percent sodium silicate is added in the dry phase mixture.
Claim 5
Dependent Claim
20 words
The method of claim 3 wherein step b) about 2.5-3.0 percent sodium silicate is added in the dry phase mixture.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein said metallic phosphate binder is an aluminum phosphate binder.
Claim 7
Dependent Claim
17 words
The method of claim 5 wherein said aluminum phosphate is represented by the formula Al2O3. 3P2O5. xH2O.
Claim 8
Dependent Claim
50 words
The method of claim 5 where about 47% water; about 0.50% silicone; about 16% aluminum phosphate binder; and about 0.50% carbon black are added in step a), and about 26% perlite; about 5.5% sodium tetraborate; about 2.5% sodium silicate; and about 2.00% chopped glass fibers are added in step b).
Claim 9
Dependent Claim
20 words
The method of claim 1 wherein the maximum grain hardness of the water is maintained below 5 grains of hardness.
Claim 10
Dependent Claim
82 words
A stress corrosion inhibiting, low density thermal insulation product consisting essentially of about 45-80% expanded perlite having a bulk density of from about 2-5 pounds per cubic feet; about 10-40% of a metallic phosphate binder; about 2.5-12.0% sodium tetraborate; about .30-4.0% silicone water repellency material; and about 1-13% of a chopped glass fiber, said product being capable of withstanding temperatures up to 1,800*F. without decomposition, having a bulk density of from 5-20 pounds per cubic foot and having relatively low thermal conductivity.
Claim 11
Dependent Claim
82 words
A stress corrosion inhibiting, low density thermal insulation product consisting essentially of about 45-80% expanded perlite having a bulk density of from about 2-5 pounds per cubic feet; about 10-40% of a metallic phosphate binder; about 2.5-12.0% sodium tetraborate; about .30-4.0% silicone water repellency material; and about 1-13% of a chopped glass fiber, said product being capable of withstanding temperatures up to 1,800*F. without decomposition, having a bulk density of from 5-20 pounds per cubic foot and having relatively low thermal conductivity.
Claim 12
Dependent Claim
21 words
The product of claim 9 wherein said metallic phosphate binder is aluminum phosphate, represented generally by the formula Al2O3. 3P2O5. xH2O.
Claim 13
Dependent Claim
21 words
The product of claim 9 wherein the bulk density of the final product is from about 8-15 pounds per cubic foot.
Claim 14
Dependent Claim
33 words
The product of claim 10 consisting essentially of about 60% perlite; about 16% aluminum phosphate binder; about 13% sodium tetraborate; about 6% sodium silicate; about 5% chopped glass; and the remainder being silicone.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |