# US 6,284,809 B1 · Thermally insulating syntactic foam composition

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- Number: US 6,284,809 B1
- Document ID: US6284809B1
- Status: Granted
- Kind: B1
- Application number: 09/456,158
- Filed: 1999-12-07
- Granted: 2001-09-04
- Earliest claimed: 1999-12-07
- Assignees: Emerson & Cuming Composite Materials, Inc.
- Inventors: John Plummer; Michael Toupin; James Yeh
- Web page: https://patentgrep.com/patent/US6284809B1

## CPC

- C08J 9/32: from compositions containing microballoons, e.g. syntactic foams
- C08J 2363/00: Characterised by the use of epoxy resins; Derivatives of epoxy resins
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)

## Abstract

A syntactic foam composition is formed from a resin binder containing microspheres and minispheres and having a thermal conductivity less than 0.120 watts/meter° K.

## Claims

### Claim 1

A syntactic foam composition comprising between about 21 and about 24 volume percent of a hardened resin, between about 14 and about 21 volume percent of microspheres and between about 55 and about 60 volume percent of minispheres based on the total volume of said syntactic foam composition, said syntactic foam composition having a thermal conductivity less than 0.120 watts/meter-° K.

### Claim 2 (depends on 1)

The syntactic foam composition of claim 1 wherein the hardened resin is epoxy resin.

### Claim 3 (depends on 1)

The composition of claim 1 having a thermal conductivity less than 0.110 watts/meter-° K.

### Claim 4 (depends on 3)

The syntactic foam composition of claim 3 wherein the hardened resin is epoxy resin.

### Claim 5 (depends on 1)

A formed insulating layer positioned about an outside surface of an apparatus suitable for use in a subsea position, said layer having a thickness between about 1 inch and about 5 feet and formed from the composition of claim 1.

### Claim 6 (depends on 2)

A formed insulating layer positioned about an outside surface of an apparatus suitable for use in a subsea position, said layer having a thickness between about 1 inch and about 5 feet and formed from the composition of claim 2.

### Claim 7 (depends on 3)

A formed insulating layer positioned about an outside surface of an apparatus suitable for use in a subsea position, said layer having a thickness between about 1 inch and about 5 feet and formed from the composition of claim 3.

### Claim 8 (depends on 4)

A formed insulating layer positioned about an outside surface of an apparatus suitable for use in a subsea position, said layer having a thickness between about 1 inch and about 5 feet and formed from the composition of claim 4.

### Claim 9 (depends on 5, 6, 7)

The formed insulating layer of any one of claims 5, 6, 7, or 8 having a cylindrical surface.