# US 2016/0355663 A1 · Polymer composition from mixed plastic waste

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- Number: US 2016/0355663 A1
- Document ID: US20160355663A1
- Status: Published application
- Kind: A1
- Application number: 15/237,647
- Filed: 2016-08-16
- Published: 2016-12-08
- Earliest claimed: 2014-04-17
- Assignees: Rolan Investment OU
- Applicants: Rolan Investment OU
- Inventors: Andrus Valdmaa; Aivo Käsnar; Aarne Saareväli
- Web page: https://patentgrep.com/patent/US20160355663A1

## CPC

- C08J 11/06: without chemical reactions
- B29B 17/0042: {for shaping parts, e.g. multilayered parts with at least one layer containing regenerated plastic}
- C08L 23/06: Polyethylene
- C08J 2300/30: Polymeric waste or recycled polymer
- C08J 2323/06: Polyethene
- C08J 2323/12: Polypropene
- C08J 2423/10: Homopolymers or copolymers of propene
- C08J 2425/04: Homopolymers or copolymers of styrene
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2205/03: containing three or more polymers in a blend
- C08L 2205/035: containing four or more polymers in a blend
- C08L 2207/20: Recycled plastic
- Y02W 30/62: Plastics recycling; Rubber recycling
- 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)
- 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
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

A process for making polymer composition from mixed plastic waste is disclosed. The composition comprises plastic waste of different types obtained from recycled unidentified, uncleaned, unsorted, compacted and homogenized plastic waste. Preferably the plastic waste comprises polyethylene (PE), approximately 50-60% of its total volume; polypropylene (PP), approximately 20-30% of its total volume; polystyrene (PS), approximately 5-10% of its total volume; a mixture of unidentified plastic and other materials, approximately 1-10% of its total volume. The mixture of unidentified plastics comprises polyamides (PA), Polyethylene terephthalate (PET), Polyacetal (POM), and Polycarbonate (PC).

## Claims

### Claim 1

A process for obtaining a polymer composition from mixed small volume weight (between 0.1-0.4 t/m3) and large volume weight (more than 0.4 t/m3) plastic waste comprising steps of:
(a) separating collected mixed plastic wastes from other waste flows,
(b) baling the mixed plastic wastes,
(c) separating the small volume weight and large volume weight plastic waste,
(d) breaking up the plastic waste of small and large volume weight respectively,
(e) separating non-plastic waste from the plastic waste of small and large volume weight respectively,
(f) preparing first raw material of polymer composition from the plastic waste of small volume weight of step e) through steps comprising of:
compacting the plastic waste of small volume weight; and
homogenizing the compacted mass,
(g) preparing second raw material of polymer composition from the plastic waste of large volume weight of step e) through steps comprising of:
drying the plastic waste of large volume weight; and
homogenizing the plastic waste,
(h) mixing the first raw material and the second raw material; and
(i) adding a mixture comprising of polystyrene (PS), polypropylene (PP) and additive selected from a group comprising of pigments in PE-carrier, UV protective agents, antioxidants, foaming agent, mineral and structure supplementing additives, glass fiber substances, textile fiber substances, mineral additives and any combination thereof, to the mixture of step (h),

### Claim 2

(canceled)

### Claim 3 (depends on 1)

The process of claim 1, wherein during breaking up large volume weight plastic waste a fraction of 3 to 10 mm is received.

### Claim 4 (depends on 1)

The process of claim 1, wherein during the drying process of large volume weight plastic waste properties of the polymers has been unified and the moisture content of the materials is decreased below 1%.

### Claim 5 (depends on 1)

The process of claim 1, wherein the obtained polymer composition has following properties:
Density in agglomerated phase: 380-450 kg/m3;
Density in melted and solidified phase: 950-1050 kg/m3;
Melt flow index (g/10 min.): 1-5;
Melting temperature: 165-180° C.;
Colour: gray;
Moisture content: below 1%;
Fraction size: up to 10 mm;
Tensile modulus (Elongation 50 mm/min): 642.76-854.28 MPa;
Tensile stress at maximum load (Elongation 50 mm/min): 14.6-17.01 MPa;
Flexural modulus (Bending rate 20 mm/min): 1126-1723 MPa;
Impact strength Charpy (Hammer 4 J): 1,938-3,544 kJ/m2;
Heat deflection temperature: 80-82° C.

### Claim 6 (depends on 1)

The process of claim 1, wherein the obtained polymer composition has following properties:
Density: 979-1026 kg/m3;
Melt flow index (g/10 min.): 2-5;
Melting temperature: 165-180° C.;
Tensile modulus (Elongation 50 mm/min): 794.97-864.70;
Tensile stress at maximum load (Elongation 50 mm/min): 18.11-21.04 MPa;
Flexural modulus (Bending rate 20 mm/min):
Impact strength Charpy (Hammer 4 J): 1,348-1,938 kJ/m2
Heat deflection temperature: 79-81° C.

### Claim 7 (depends on 1)

The process of claim 1, wherein the obtained polymer composition comprises of material from the plastic waste of small volume weight 50% to 75% and plastic waste of large volume weight 25% to 50%.

### Claim 8 (depends on 1)

The process of claim 1, wherein the compacting the plastic waste of small volume weight step further comprises steps of:
disintegrating the plastic waste,
mixing, heating and melting the plastic waste,
rapidly cooling in to a hardened mass; and
breaking the hardened mass.

### Claim 9 (depends on 1)

The process of claim 1, wherein during the compacting process the volume of the plastic waste of small volume weight is compacted approximately ten times.

### Claim 10 (depends on 1)

The process of claim 1, wherein during the compacting process of small volume weight plastic waste moisture content of the material is reduced below 1%.

### Claim 11 (depends on 8)

The process of claim 8, wherein during breaking up of the hardened mass a uniform fraction having a size of 1 to 10 mm is received.

### Claim 12 (depends on 1)

The process of claim 1, wherein the obtained polymer composition comprises of polyethylene (PE), approximately 50-60% of its total volume; polypropylene (PP), approximately 20-30% of its total volume; polystyrene (PS), approximately 5-10% of its total volume; and a mixture of unidentified plastic and other materials, approximately 1-10% of its total volume.

### Claim 13 (depends on 1)

The process of claim 1, wherein the temperature of the compacted small volume weight plastic waste at the homogenization step is 115° C. to 165° C.