# US 4,391,969 A · Modified sulfur cement

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- Number: US 4,391,969 A
- Document ID: US4391969A
- Status: Granted
- Kind: A
- Application number: 06/266,484
- Filed: 1981-05-22
- Granted: 1983-07-05
- Earliest claimed: 1979-10-16
- Assignees: The United States of America as represented by the Department of Commerce
- Inventors: William C. McBee; Thomas A. Sullivan
- Web page: https://patentgrep.com/patent/US4391969A

## CPC

- C04B 28/36: containing sulfur, sulfides or selenium
- C08G 75/00: Macromolecular compounds obtained by reactions forming a linkage containing sulfur with or without nitrogen, oxygen, or carbon in the main chain of the macromolecule
- C08G 75/14: Polysulfides
- 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
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

A modified sulfur cement formulation, comprising the polymeric reaction puct of sulfur with a cyclopentadiene oligomer-dicyclopentadiene containing modifier in which the cyclopentadiene oligomer content of said modifier is at least 37 wt. %, the sulfur cement product having a softening point ranging up to 116.degree. C.

## Claims

### Claim 1

A modified sulfur cement formulation, consisting essentially of:
the polymeric reaction product of sulfur with from 2 to 20 wt. % of a cyclopentadiene oligomer mixture-dicyclopentadiene containing modifier, said cyclopentadiene oligomer mixture being free of dicyclopentadiene, wherein the cyclopentadiene oligomer mixture content of said modifier is at least 37 wt. %, said sulfur cement product having a softening point ranging up to 116.degree. C.

### Claim 2 (depends on 1)

The formulation of claim 1, wherein the content of said oligomer in said modifier ranges from 37 wt. % to 75 wt. %.

### Claim 3 (depends on 1)

The formulation of claim 1, wherein from 2 to 10 wt. % modifier is combined with 98 to 90 wt. % sulfur.

### Claim 4 (depends on 1)

The formulation of claim 1, wherein the sulfur-modifier mixture during the reaction leading to said cement product has a viscosity of up to about 180 cp at 135.degree. C.

### Claim 5 (depends on 4)

The formulation of claim 4, wherein said viscosity ranges from 25 to 180 cp.

### Claim 6 (depends on 4)

The formulation of claim 4, wherein when said modifier ranges in concentration between 10% and 20%, at least 60 wt % of said modifier must be said oligomer component.

### Claim 7

A method of preparing a hot modified sulfur cement ready for casting, comprising:
reacting sulfur with from 2 up to but not including 20 wt. % of a cyclopentadiene oligomer mixture-dicyclopentadiene containing modifier, said oligomer mixture being free of dicyclopentadiene, in which the cyclopentadiene oligomer content of said modifier is at least 37 wt. %, the mixture of sulfur and modifier during the reaction exhibiting a viscosity at 135.degree. C. up to about 180 cp.

### Claim 8 (depends on 7)

The method of claim 7, wherein said elevated temperature ranges from 115.degree. C. to 160.degree. C.