# US 2014/0155523 A1 · Synthetic raw elastomeric compositions in free-flowing pellet form and process for obtaining the same

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- Number: US 2014/0155523 A1
- Document ID: US20140155523A1
- Status: Published application
- Kind: A1
- Application number: 14/007,425
- Filed: 2012-03-21
- Published: 2014-06-05
- Earliest claimed: 2011-03-25
- Assignees: Dynasol Elastómeros, S.A. de C.V.
- Inventors: Gabriel Hernández-Zamora; Ricardo Sánchez-Ortega; Zenón Rodríguez-Juarez; Ismael Camacho-Salas; Sergio Moctezuma-Espiricueto
- Web page: https://patentgrep.com/patent/US20140155523A1

## CPC

- C09J 109/06: Copolymers with styrene
- B29B 9/12: characterised by structure or composition
- C08J 3/124: {Treatment for improving the free-flowing characteristics}
- C08K 13/02: Organic and inorganic ingredients
- C08L 95/00: Compositions of bituminous materials, e.g. asphalt, tar, pitch
- C09J 11/04: inorganic
- C09J 11/06: organic
- C09J 147/00: Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Adhesives based on derivatives of such polymers (C09J145/00 takes precedence; based on conjugated diene rubbers C09J109/00 - C09J121/00)
- C09J 195/00: Adhesives based on bituminous materials, e.g. asphalt, tar, pitch
- B29B 9/06: in the form of filamentary material, e.g. combined with extrusion
- B29B 9/16: Auxiliary treatment of granules
- C08J 2325/10: with conjugated dienes
- C08K 3/013: Fillers, pigments or reinforcing additives
- C08K 3/22: of metals
- C08K 3/26: Carbonates; Bicarbonates
- C08K 3/30: Sulfur-, selenium- or tellurium-containing compounds
- C08K 3/34: Silicon-containing compounds
- C08K 3/36: Silica
- C08K 5/098: Metal salts of carboxylic acids
- C08K 2003/2206: {of calcium, strontium or barium}
- C08K 2003/2227: {of aluminium}
- C08K 2003/2241: {Titanium dioxide}
- C08K 2003/265: {Calcium, strontium or barium carbonate}
- C08K 2003/3063: {Magnesium sulfate}
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- 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
- 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)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A raw elastomeric composition in free-flowing pellet form is described, which comprises a raw elastomer with molecular weight from 50,000 to 400,000 Da, and an anti-block agent comprising inorganic fillers, capable of forming emulsions in water. Likewise, a process for obtaining said raw elastomeric compositions in free-flowing pellet form, comprising the steps of: a) polymerizing at least one monomer through solution polymerization in order to obtain elastomer crumb; b) forming an aqueous suspension of the elastomer crumbs; c) dewatering the aqueous suspension; d) adding an anti-block agent comprising inorganic fillers capable of forming emulsions in water; e) drying the dewatered suspension; and f) pelletizing the elastomer to form a raw elastomeric composition in free-flowing pellets form. The raw elastomeric composition in free-flowing pellets form thus obtained can be used as an adhesive composition, in asphalt modification and in asphalt emulsions.

## Claims

### Claim 1

A raw elastomeric composition in free-flowing pellet form comprising:
a) a raw elastomer with molecular weight from 50,000 to 400,000 Da; and,
b) from 1 to 15% by total weight of an anti-block agent comprising inorganic fillers, capable of forming emulsions in water.

### Claim 2 (depends on 1)

The elastomeric composition of claim 1, wherein the elastomer is selected between Solution-SBR, Emulsion-SBR, SB di-block copolymers and tapered triblock copolymers.

### Claim 3 (depends on 2)

The elastomeric composition of claim 2, wherein the elastomer is a styrene—butadiene copolymer with butadiene content higher than 60% weight/weight.

### Claim 4 (depends on 1)

The elastomeric composition of claim 1, wherein the inorganic fillers contained in the anti-block agent are selected from the group comprising metallic carbonates, metallic sulfates, metallic oxides, metallic hydroxides, metallic aluminosilicates, alumina, silica, talc and combinations thereof, in combination with a compatible emulsifier capable of forming emulsions of the same in water.

### Claim 5 (depends on 4)

The elastomeric composition of claim 4, wherein the inorganic fillers contained in the anti-block agent are selected from the group comprising calcium carbonate, magnesium sulfate, calcium oxide, titanium dioxide, calcium hydroxide, potassium aluminosilicate, calcium aluminosilicate, alumina, silica, talc and combinations thereof.

### Claim 6 (depends on 5)

The elastomeric composition of claim 5, wherein the inorganic fillers contained in the anti-block agent are selected from the group comprising magnesium sulfate, titanium dioxide, calcium hydroxide, silica, potassium aluminosilicate, calcium aluminosilicate, talc and combinations thereof.

### Claim 7 (depends on 4)

The elastomeric composition of claim 4, wherein the compatible emulsifier is selected from alkaline salts of organic fatty esters with less than 20 carbon atoms.

### Claim 8 (depends on 7)

The elastomeric composition of claim 7, wherein the compatible emulsifier is a stearate.

### Claim 9 (depends on 1)

The elastomeric composition of claim 1, wherein the anti-block agent comprises:
a) 3-9% w/w calcium hydroxide;
b) 0.3-1.1% w/w talc;
c) 0.5-2% w/w titanium dioxide;
d) 0.3-1% w/w calcium aluminosilicate;
e) 0.2-0.7% w/w potassium aluminosilicate
f) 0.5-1.5% w/w magnesium sulfate;
g) 75-85% w/w silica; and
h) 7-11% w/w calcium stearate.

### Claim 10 (depends on 1)

The elastomeric composition of claim 1, wherein the anti-block agent can be used in powder form or as a water-based emulsion with solids content from about 5 to about 50% by weight.

### Claim 11 (depends on 1)

The elastomeric composition of claim 1, wherein the anti-block agent is added in the range of 2 to 8% by weight.

### Claim 12 (depends on 1)

The elastomeric composition of claim 1, wherein the pellets have a maximum particle size of 2 inches.

### Claim 13 (depends on 1)

The elastomeric composition of claim 1, wherein it has a melt flow index of 3 to 13.1 g/10 min.

### Claim 14 (depends on 1)

The elastomeric composition of claim 1, wherein it is required a maximum force of 120 kgf to loosen into particle form again after applying a continuous force of 2.76 kg at 50° C. for 90 hours.

### Claim 15

A process for obtaining raw elastomeric compositions in free-flowing pellet form, comprising the steps of:
a) Polymerizing at least one monomer through solution polymerization in order to obtain elastomer crumbs;
b) Forming an aqueous suspension of the elastomer crumbs to eliminate polymerization solvents and residues;
c) Dewatering the aqueous suspension to achieve a maximum water content of 25% by weight;
d) Adding from 0.1 to 15% of an anti-block agent comprising inorganic fillers capable of forming emulsions in water;
e) Drying the dewatered suspension to achieve a maximum water content of 1%; and
f) Pelletizing the elastomer to form a raw elastomeric composition in free-flowing pellets form with maximum particle size of 2 inches.

### Claim 16 (depends on 14)

The process for obtaining elastomeric compositions of claim 14, wherein the dewatering stage is performed through an extrusion equipment of the type known as single screw spindle.

### Claim 17 (depends on 14)

The process for obtaining elastomeric compositions of claim 14, wherein the drying step is performed through extrusion processes.

### Claim 18 (depends on 16)

The process for obtaining elastomeric compositions of claim 16, wherein the drying step is performed through extrusion equipment of the single screw type having a variable configuration.

### Claim 19 (depends on 16)

The process for obtaining elastomeric compositions of claim 16, wherein the elastomeric composition is additionally dried in another step through a fluidized bed process with hot air.

### Claim 20 (depends on 18)

The process for obtaining elastomeric compositions of claim 18, comprising an additional step of spraying the pellets by the anti-block additive.

### Claim 21

An adhesive composition comprising:
a) a raw elastomer with molecular weight from 50,000 to 400,000 Da; and,
b) from 1 to 15% by total weight of an anti-block agent comprising inorganic fillers, capable of forming emulsions in water,
wherein the adhesive composition has adhesive properties above the minimum parameters required for application as adhesive.

### Claim 22 (depends on 21)

An adhesive composition according to claim 21, wherein the Brookfield viscosity at 177° C. is maximum 5741 cP, the softening temperature is at least 75° C., Tension is at least 1.4 MPa, Loop Tack is at least 1.59 lbf, the Peel is at least 1.81 lbf, and Shear is at least 33 minutes.

### Claim 23

A modified asphalt emulsion of the type comprising an asphalt emulsion and an elastomer, wherein the elastomer is a raw elastomeric composition in free-flowing pellet form comprising:
a) a raw elastomer with molecular weight from 50,000 to 400,000 Da; and
b) from 1 to 15% by total weight of an anti-block agent comprising inorganic fillers, capable of forming emulsions in water.

### Claim 24 (depends on 23)

The modified asphalt emulsion of claim 23, wherein in order to achieve the same adherence of the asphalt emulsion, a lower amount of the elastomeric composition is used.

### Claim 25

A modified asphalt of the type comprising asphalt and an elastomer, wherein the elastomer is a raw elastomeric composition in free-flowing pellet form comprising:
a) a raw elastomer with molecular weight from 50,000 to 400,000 Da; and,
b) from 1 to 15% by total weight of an anti-block agent comprising inorganic fillers, capable of forming emulsions in water.
i.

### Claim 26 (depends on 25)

The modified asphalt of claim 25, wherein the maximum rheological-failure temperature (RFT) is at least 90 ° C. when the modified asphalt is processed.