# US 10,479,876 B2 · Sulphur containing additive for making bitumen paving mixtures

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- Number: US 10,479,876 B2
- Document ID: US10479876B2
- Status: Granted
- Kind: B2
- Application number: 15/560,725
- Filed: 2016-03-22
- Published: 2018-03-15
- Granted: 2019-11-19
- Earliest claimed: 2015-03-25
- Assignees: Reliance Industries Limited
- Applicants: Reliance Industries Limited
- Inventors: Raksh Vir Jasra; Nagarathinam Shenbaga Murthy; Mayur Navinchandra Talati; Lintoan John; Srinivasarao Pothuru; Satish Kumar; Kalpeshkumar Bhikhubhai Sidhpuria; Yogesh Suresh Niwate; Prakash Kumar; Kalpana Gopalakrishnan; Vijayalakshmi Ravi Puranik
- Web page: https://patentgrep.com/patent/US10479876B2

## CPC

- C08K 3/06: Sulfur
- C04B 26/26: Bituminous materials, e.g. tar, pitch {(C08L95/00 takes precedence)}
- C08K 3/22: of metals
- C08K 3/30: Sulfur-, selenium- or tellurium-containing compounds
- C08K 3/34: Silicon-containing compounds
- C08K 3/36: Silica
- C08L 95/00: Compositions of bituminous materials, e.g. asphalt, tar, pitch
- C08K 2003/2206: {of calcium, strontium or barium}
- C08K 2003/2227: {of aluminium}
- C08K 2003/2272: {Ferric oxide (Fe2O3)}
- C08K 2003/3045: {Sulfates}
- C08K 2201/014: Additives containing two or more different additives of the same subgroup in C08K
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- 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
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

The present disclosure relates to a sulphur containing additive for bitumen paving mixtures. The sulphur containing additive comprises sulphur, a mixture of metal oxides, and optionally 5 at least one metal sulphate. The mixture of metal oxides includes calcium oxide, silicon dioxide, aluminum oxide and ferric oxide.

## Claims

### Claim 1

A sulphur containing additive for bitumen paving mixtures, said sulphur containing additive comprising:
a. sulphur;
b. a mixture of metal oxides; and
c. optionally, at least one metal sulphate,
wherein said mixture of metal oxides comprises calcium oxide in an amount in the range of 50 weight % to 60 weight %, silicon dioxide in an amount in the range of 25 weight % to 30 weight %, aluminium oxide in an amount in the range of 1 weight % to 2 weight %, and ferric oxide in an amount in the range of 8 weight % to 10 weight %.

### Claim 2 (depends on 1)

The sulphur containing additive as claimed in claim 1, wherein
a. said sulphur is in an amount in the range of 85 to 98 weight % of said sulphur containing additive;
b. said mixture of metal oxides is in an amount in the range of 2 to 15 weight % of said sulphur containing additive; and
c. said at least one metal sulphate is in an amount ranging from 0 to 10 weight % of said sulphur containing additive.

### Claim 3 (depends on 1)

The sulphur containing additive as claimed in claim 1, wherein said metal sulphate is calcium sulphate.

### Claim 4 (depends on 1)

The sulphur containing additive as claimed in claim 1, wherein said sulphur containing additive is molded into at least one solid article shape selected from the group consisting of pastilles, flakes, extrudates and granules.

### Claim 5 (depends on 1)

A process for preparing said sulphur containing additive as claimed in claim 1 for said bitumen paving mixture, said process comprising the following steps:
a. melting said sulphur at a temperature up to 160° C. in a reactor to obtain molten sulphur;
b. adding said mixture of metal oxides, optionally said metal sulphate to said molten sulphur to obtain a blend;
c. melting and stirring said blend at a temperature up to 160° C. to obtain a molten blend; and
d. cooling said molten blend to obtain said sulphur containing additive.

### Claim 6 (depends on 1)

A process for preparing the sulphur containing additive as claimed in claim 1 for said bitumen paving mixture, said process comprising the following steps:
a. mixing said mixture of metal oxides and optionally said metal sulphate with sulphur to obtain a blend;
b. melting and stirring said blend at a temperature up to 160° C. to obtain a molten blend; and
c. cooling said molten blend to obtain said sulphur containing additive.

### Claim 7 (depends on 1)

A process for preparing a bitumen paving mixture, said process comprising mixing said sulphur containing additive of claim 1 to bitumen at a temperature in the range of 80 to 180° C. and stirring at a speed ranging from 20 to 100 rpm.