# US 4,394,337 A · Thermal insulating body and a process for making the same

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- Number: US 4,394,337 A
- Document ID: US4394337A
- Status: Granted
- Kind: A
- Application number: 06/196,171
- Filed: 1980-10-14
- Granted: 1983-07-19
- Earliest claimed: 1979-10-13
- Assignees: Grunzweig & Hartmann und Glasfaser AG
- Inventors: Hans Kummermehr
- Web page: https://patentgrep.com/patent/US4394337A

## CPC

- C04B 28/00: Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- F16L 59/00: Thermal insulation in general
- F16L 59/04: Arrangements using dry fillers, e.g. using slag wool
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL

## Abstract

A thermal insulating body or shape is made up of highly dispersed insulating material together with mineral fiber wool and of opacifier together with a binder for curing. The binder, which is evenly distributed in a first-stage mix with a dispersant, is present in a finely dispersed condition in the insulating material, the corners and edges of the insulating material being able to undergo cross-linking with the binder by heat processing.

## Claims

### Claim 1

A process for making a thermal insulating body, comprising,
forming a first admixture of a binder and a dispersant, wherein the dispersant is present in an amount of 0.5 to 20% by weight of the binder and wherein the particle size of the binder is generally 1 micron or less;
mixing the first admixture with a highly dispersed insulating material to form a second admixture; and
then pressing and curing the second admixture, by application of heat, so that the edges and corners of the insulating material undergo cross-linking with the binder.

### Claim 2 (depends on 1)

The process according to claim 1, wherein the binder is soda or sodium sulfate.

### Claim 3 (depends on 1)

The processes according to claim 1, wherein the dispersant is hydrophobized silica, pyrogenic silica, polytetrafluoroethylene or mixtures thereof.

### Claim 4 (depends on 1)

The process according to claim 1, wherein the dispersant is hydrophobized silica.

### Claim 5 (depends on 3)

The process according to claim 3, wherein the dispersant is present in an amount of 5-10% by weight of the binder.

### Claim 6 (depends on 1)

The process according to claim 1, further comprising adding to said second admixture an opacifier selected from the group consisting of graphite; carbon black; oxides of titanium; chromium oxide; manganese oxide; iron oxide; carbides of silicon; boron; tantalum; tungsten or mixtures thereof; aluminum; tungsten; silicon; zircon; and lead monoxide.

### Claim 7 (depends on 1)

The process according to claim 1, wherein the particle sizes of the binder, the dispersant, the insulating material and the opacifier are all less than 1 micron.

### Claim 8 (depends on 1)

The process according to claim 1, wherein ratio of binder to insulating material is within the range of 2:98 to 30:70.

### Claim 9 (depends on 8)

The process according to claim 8, wherein the ratio of binder to insulating material is 10:90.

### Claim 10 (depends on 1)

The process according to claim 1, wherein the curing is conducted by heating at a temperature of 500.degree. to 700.degree. C.

### Claim 11 (depends on 1)

The process according to claim 1, wherein curing is conducted in a high frequency or microwave oven.

### Claim 12 (depends on 1)

The process according to claim 1, further comprising the steps of
dividing said second admixture into a first portion and a second portion;
forming a first layer of said first portion;
laying down upon said first layer, a second layer comprising insulating material;
laying down upon said second layer, a third layer formed from said second portion; and
then pressing and curing the so-formed three layer composite.

### Claim 13 (depends on 1)

The process according to claim 1, wherein the insulating material comprises mineral fibers containing a cured binder.