# US 10,119,031 B2 · Method for obtaining a carbon black powder by pyrolyzing scrap rubber, the carbon black thus obtained and the use thereof

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- Number: US 10,119,031 B2
- Document ID: US10119031B2
- Status: Granted
- Kind: B2
- Application number: 15/400,451
- Filed: 2017-01-06
- Published: 2017-04-27
- Granted: 2018-11-06
- Earliest claimed: 2011-12-22
- Assignees: Black Bear Carbon B.V.
- Applicants: Black Bear Carbon B.V.
- Inventors: Arnoldus Henricus Adrianus Verberne; Jan Anne Jonkman; Christopher Michael Twigg
- Web page: https://patentgrep.com/patent/US10119031B2

## CPC

- C09C 1/0081: {Composite particulate pigments or fillers, i.e. containing at least two solid phases, except those consisting of coated particles of one compound (C09C1/0015, C09C1/0078 take precedence)}
- B29B 17/04: Disintegrating plastics, {e.g. by milling}(B29B9/02, B29B11/02, B29B13/10, {B29B17/02} take precedence)
- C01B 32/324: from waste materials, e.g. tyres or spent sulfite pulp liquor
- C08K 3/04: Carbon
- C08K 3/36: Silica
- C09C 1/482: {Preparation from used rubber products, e.g. tyres (recovery of plastics or other constituents of waste material containing plastics B29B17/00)}
- B29B 2017/0496: {Pyrolysing the materials}
- B29L 2030/00: Pneumatic or solid tyres or parts thereof {(conveyor belts B29L2031/7092; drive belts B29L2031/7094; fourdrinier belts B29L2031/733)}
- C01P 2004/51: Particles with a specific particle size distribution
- C01P 2004/64: Nanometer sized, i.e. from 1-100 nanometer
- C01P 2006/12: Surface area
- C01P 2006/19: Oil-absorption capacity, e.g. DBP values
- C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS}
- B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

The present invention relates to a method for recycling scrap rubber comprising the steps of pyrolyzing scrap rubber to obtain a char material and milling the thus obtained char material. The present invention also relates to carbon black powders and carbon black pellets obtained by the method according to the invention. Moreover, the present invention relates to the use of said carbon black powder and to compositions comprising said carbon black powders.

## Claims

### Claim 1

A scrap rubber derived carbon black powder, wherein the scrap rubber derived carbon black powder comprises:
a) 60-98 wt. % of carbon black,
b) less than 2.0 wt. % of volatiles,
c) 0-30 wt. % of silica, and
d) zinc sulfide in an amount of 1-5 wt. %, based on the total weight of the carbon black powder,
wherein the scrap rubber derived carbon black powder has a particle size distribution of D99 less than 4 μm and D50 less than 0.3 μm,
wherein the scrap rubber derived carbon black powder has a BET surface area of at least 60 m2/g;
wherein the scrap rubber derived carbon black powder has a STSA (statistical thickness surface area) of between 46-86 m2/g; and
wherein the scrap rubber derived carbon black has a polyaromatic hydrocarbon (PAH) content of less than 0.50 mg/kg.

### Claim 2 (depends on 1)

The scrap rubber derived carbon black powder according to claim 1, which further comprises zinc oxide in an amount of 1-5 wt. %, based on the total weight of the carbon black powder.

### Claim 3 (depends on 2)

The scrap rubber derived carbon black powder according to claim 2, wherein the ratio between said zinc oxide and said zinc sulfide is between 1:10 to 10:1.

### Claim 4 (depends on 1)

The scrap rubber derived carbon black powder according to claim 1, having an oil absorption number between 67-97 m3/g.

### Claim 5 (depends on 1)

The scrap rubber derived carbon black powder according to claim 1, having a primary particle size of between 20-40 nm.

### Claim 6 (depends on 1)

The scrap rubber derived carbon black powder according to claim 1, wherein the PAH content is less than 0.25 mg/kg.

### Claim 7 (depends on 1)

The scrap rubber derived carbon black powder according to claim 1, wherein the PAH content is less than 0.01 mg/kg.