GB2558675A - A thermoplastic blend for the manufacture of cloth hangers by injection molding (ANU 99) - Google Patents

A thermoplastic blend for the manufacture of cloth hangers by injection molding (ANU 99) Download PDF

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Publication number
GB2558675A
GB2558675A GB1700955.6A GB201700955A GB2558675A GB 2558675 A GB2558675 A GB 2558675A GB 201700955 A GB201700955 A GB 201700955A GB 2558675 A GB2558675 A GB 2558675A
Authority
GB
United Kingdom
Prior art keywords
styrene
polystyrene
injection molding
recycled
hangers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1700955.6A
Other versions
GB201700955D0 (en
Inventor
Anurath Abeyratne Malagalage
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Korean SpA Packaging Pvt Ltd
Original Assignee
Korean SpA Packaging Pvt Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Korean SpA Packaging Pvt Ltd filed Critical Korean SpA Packaging Pvt Ltd
Publication of GB201700955D0 publication Critical patent/GB201700955D0/en
Publication of GB2558675A publication Critical patent/GB2558675A/en
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47G—HOUSEHOLD OR TABLE EQUIPMENT
    • A47G25/00—Household implements used in connection with wearing apparel; Dress, hat or umbrella holders
    • A47G25/14—Clothing hangers, e.g. suit hangers
    • A47G25/28—Hangers characterised by their shape
    • A47G25/36—Hangers characterised by their shape characterised by the selection of the material, e.g. paper, board, plastics, glass
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/02—Homopolymers or copolymers of hydrocarbons
    • C08L25/04—Homopolymers or copolymers of styrene
    • C08L25/06—Polystyrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L17/00—Compositions of reclaimed rubber
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/02—Homopolymers or copolymers of hydrocarbons
    • C08L25/04—Homopolymers or copolymers of styrene
    • C08L25/08—Copolymers of styrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L51/04—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

The present invention is a thermoplastic compound material designed specifically for manufacturing of plastic clothes hangers by conventional injection molding. The composition consists of 100% recycled materials made by reactive blending of both regrind of consumer used clothes hangers having a composition of styrene based compound resin which contains styrene block like high impact polystyrene (HIPS), general purpose polystyrene (GPPS) blended with a recycled hydrogenated midblock of styrene-­ethylene-propylene-styrene (SEPS) rubber.

Description

(54) Title of the Invention: A thermoplastic blend for the manufacture of cloth hangers by injection molding (ANU 99)
Abstract Title: Thermoplastic blend for the manufacture of clothes hangers (57) The present invention is a thermoplastic compound material designed specifically for manufacturing of plastic clothes hangers by conventional injection molding. The composition consists of 100% recycled materials made by reactive blending of both regrind of consumer used clothes hangers having a composition of styrene based compound resin which contains styrene block like high impact polystyrene (HIPS), general purpose polystyrene (GPPS) blended with a recycled hydrogenated midblock of styrene-ethylene-propylene-styrene (SEPS) rubber.
A THERMOPLASTIC BLEND FOR THE MANUFACTURE OF CLOTH HANGERS BY INJECTION
MOLDING [ANU 99]
DESCRIPTION
1. BACKGROUND OF THE INVENTION
Polystyrene plastic based hanger is a versatile hanger as it is lightweight, inexpensive, strong, easily manufactured hence finds application ail over the world.
As production of polystyrene plastic based hangers continues to grow, process waste, scrap and consumer used hangers are discarded into the environment. As polystyrene based plastics are not disintegrating in natural environment, they cause serious ecological damage if not recycled.
Being thermoplastic by nature polystyrene based plastics can be easily recycled by re-melting and re-shaping into new product. However, re -ground plastics are usually used in a very limited quantity up to 30% being blended with 70% virgin plastic and above in production of hangers by injection molding process. The reason for limited application of reground plastic up 30% is associated with structural changes mainly chain scission and cross-linking taking place during service life. This variation in structure causes variation of the Ability of plastic melt to flow in the barrel of the injection molding machine and in the flow path channels of the injection mold. Therefore, plastic hanger may have number of common injection molding defects like flow marks, warpage, surface gloss defects. Additionally to that weathering, aging, contamination or thermo- mechanical degradation and thermal oxidation can cause severe deterioration in properties of hanger material. Especially the properties like impact strength and flexibility (elongation at break) are mostly effected. This limits suitability of plastic scrap for further recycling and reprocessing. Therefore, upgrading the material properties and processing performance is very important when recycling polystyrene plastic based hangers.
In order to improve performance of plastic reground composition especially impact strength and flexibility {elongation in break) a thermoplastic recycled elastomer is added in quantity which does not exceed 10%. The Thermoplastic Elastomer (TPE) contains styrene block copolymer with a hydrogenated midbiock of siyrene-eihyiene/butyiene-styrene (SEBS) rubber. In thermoplastic elastomer, the polystyrene blocks are linked together with hydrogenated rubber. Thus, the plastic composition for injection molding of cloth hanger includes rigid plastic and flexible rubber. Recycled high impact polystyrene (HIPS) as well as polystyrene (GPRS) have a very good compatibility with this kind of TPE as two of them have the same styrene blocks.
There is a Large difference in glass transition temperatures between high impact polystyrene as well as GPRS when compared with glass transition temperature of rubber. This difference in glass transition temperatures makes the proposed thermoplastic blend behave like all thermoplastic at high temperature occurring during injection molding. On the other hand, the offered composition possesses good flow and moldability. After injecting into dosed mold the composition gets cooled. High impact polystyrene and GPRS become rigid and physically bonded to rubber part that remains flexible until temperature drops down below zero Centigrade. Such combination of rigid plastic and flexible rubber at room temperature imparts to molded product excellent structural stability rigidity due to presence of rigid plastic and excellent resistance to impact due to presence of elastic rubber component.
2. SUMMARY OF THE INVENTION
The subject of the present invention is a thermoplastic blend (Compound) for injection molding of cloth hangers. The major component of the thermoplastic blend (Compound) is a recycled material.
The recycled material is made of at least two components. First major component is reground waste of styrene based plastics that is usually above 90%. The other minor component which is also a recycled material - thermoplastic elastomer (TPE). it compromises styrene's group block copolymer with a hydrogenated midblock of styrene-ethylene/propylene-styrene (SEPS)-7,5% or styrene-ethylene/propylene-styrene (SEPS) or similar.
The said reground waste of styrene based plastic comprises recycled high impact polystyrene (HIPS) that can be taken alone or with addition of general purpose polystyrene (GPPS) up to 40% depending on performance properties required by some products. GPPS is a brittle plastic by its nature as its glass transition temperature is above room temperature. Addition of GPPS is required for some products to achieve better structural stability, rigidity and higher hardness values.
The present invention [ANU 99] is comprised mainly of two components namely Ά' and 'B'.
Component Ά' is 90% to 97% by weight of regrind of consumer used cloth hangers made of polystyrene based resin. The component Ά' is comprised of two sub components, namely ΆΓ and Ά2'.
Component ΆΓ is 60% to 100% by weight of High Impact Polystyrene (ΗIPS)/graft-high impact strength polystyrene, manufactured by copolymerization of styrene monomer with styrene butadiene rubber and Component Ά2' is 0% to 40% by weight of General Purpose Polystyrene (GPPS)/polymer made by polymerization of Vinyl-benzene monomer.
The Component 'B' is 3% to 10% by weight of recycled hydrogenated midblock of styreneethylene/propylene-styrene (SEPS) rubber.
The Component Ά' could also be of recycled cloth hangers made of ANU 99 itself upon completion of one or greater number of service life.
'ANU 99' is an environmental friendly thermoplastic compound, as hangers made out of 'ANU 99' can be re-used many times creating no scrap for land filling and reducing carbon footprint when compared to the manufacturing and processing of virgin plastics.
3. DETAILED DESCRIPTION OF THE INVENTION
The present invention 'ANU 99' is a thermoplastic compound material designed specifically for manufacturing of plastic cloth hangers by the process called conventional injection molding. ANU 99’s composition consists of 100% recycled materials made by reactive blending of both regrind of consumer used cloth hangers having a composition of styrene based compound resin which contains styrene block like HIPS, GPPS with a recycled hydrogenated midblock of styreneethylene/propylene-styrene (SEPS) rubber.
The regrind material means, ground or chopped material that at least once was injection molded and wasted after or during service life as unfit to fulfill the consumer requirements.
Any thermoplastic processed by injection molding loses its elastic and other related properties at every service cycle and it becomes only a bulk filler whereas re-use becomes very limited and balance contributes to land filling. Hence if during recycling the lost properties of thermoplastic are regained it can be reused multiple times without limiting use of the amount of recycled material in the compound.
Recycled HIPS used is obtained in the form of process waste or in the form of scrapped hangers after service life.
Re-ground HIPS is usually used in a very limited quantity up to 30% with fresh material in production of hangers by injection molding process. The reason for limited quantity is associated with common injection molding problems experienced by manufacturers when working with recycled materials. Weathering, aging, contamination or thermo- mechanical degradation and thermal oxidation can cause significant change in the structure of plastic resulting in serious processing and performance issues when making hangers from recycled plastics. Due to said reason recycled material will have deteriorated properties. Hence the properties like impact strength and flexibility (elongation at break) are mostly effected. Additionally to that structural changes mainly chain scission with certain degree of cross-linking cause variation in ability of plastic melt to flow in the barrel of the injection molding machine and in the flow path channels of the injection mold leading to number of defects like flow marks, warpage, surface gloss defects.
This limits suitability of plastic scrap for further recycling and reprocessing. This sets the limit for the number of times that a material can be recycled. In order to improve performance of plastic composition especially impact strength and flexibility (elongation in break) a TPE is added in quantity which does not exceed usually 10%. The thermoplastic elastomer (TPE) contains recycled styrene block copolymer with a hydrogenated midblock of styreneethylene/butylene-styrene (SEBS) or styrene-ethylene/propylene-styrene (SEPS) or similar. In thermoplastic elastomer, the polystyrene blocks are linked together with hydrogenated rubber or equivalent. The plastic composition for injection molding of cloth hanger includes rigid plastic and flexible rubber. Recycled high impact polystyrene as well as polystyrene have a very good compatibility with this kind of TPE as both of them have the same styrene blocks.
There is a Large difference in glass transition temperatures between high impact polystyrene as well as GPPS. and rubber results in thermoplastic behavior of offered plastic composition at high temperature occurring during injection molding. Therefore, the offered composition possesses good flow' and moidability. After injecting into closed mold the composition gets cooled. High impact polystyrene and GPPS become rigid and physically bonded to rubber part that remains flexible until temperature drops down below zero Centigrade. Such combination of rigid plastic and flexible rubber gives molded product, that has an excellent structural stability rigidity due to presence of rigid plastic and possesses excellent resistance to impact due to presence of elastic rubber component.
Such composition can be melted and reprocessed several times without deterioration in performance properties of injection molded hangers. This thermoplastic hanger can be re-used many times that makes them environmental friendly as no scrap goes in land filling and reduces carbon footprint when compared to the manufacturing and processing of virgin plastics.

Claims (3)

CLAIMS What is claimed is:
1. A Thermoplastic blend, for the use of manufacture of cloth hangers by injection molding, comprising components Ά' and 'B';
Ά': 90% to 97% by weight of regrind of consumer used cloth hangers made of polystyrene based resin comprising components of ΆΓ and Ά2';
ΆΓ: 60% to 100% by weight of High Impact Polystyrene (ΗIPS)/graft-high impact strength polystyrene, manufactured by copolymerization of styrene monomer with styrene butadiene rubber;
Ά2': 0% to 40% by weight of General Purpose Polystyrene (GPPS)/polymer made by polymerization of Vinyl-benzene monomer;
'B': 3% to 10% by weight of recycled hydrogenated midblock of styreneethylene/propylene-styrene (SEPS) rubber.
2. The Thermoplastic blend of claim 1 wherein the Component Ά' comprises or consists of recycled cloth hangers made of a composition according to claim 1 upon completion of one or greater number of service life.
3. The Thermoplastic blend according to claim 1 or claim 2, wherein the blend comprises or consists of ANU99.
Intellectual
Property
Office
Application No: GB1700955.6 Examiner: Mr Martin Price
GB1700955.6A 2017-01-09 2017-01-19 A thermoplastic blend for the manufacture of cloth hangers by injection molding (ANU 99) Withdrawn GB2558675A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LK1914717 2017-01-09

Publications (2)

Publication Number Publication Date
GB201700955D0 GB201700955D0 (en) 2017-03-08
GB2558675A true GB2558675A (en) 2018-07-18

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0799857A2 (en) * 1996-04-03 1997-10-08 Shell Internationale Researchmaatschappij B.V. High impact polyphenylene ether/styrene resin/elastomer composition
CN102786761A (en) * 2012-08-20 2012-11-21 四川长虹格润再生资源有限责任公司 Modified high-impact polystyrene plastic
BR132013009953E2 (en) * 2013-04-24 2015-01-06 Gilberto Luiz Zanette FORMULATION OF RECYCLED THERMOPLASTIC COMPOSITE FOR PROFILE EXTRUSION, FORMULATION OF THERMOPLASTIC COMPOSITE FOR CO-EXTRUSION OF THESE PROFILES AND PROCESS FOR MANUFACTURING COMPOSITES
CN104788838A (en) * 2015-04-14 2015-07-22 安徽联科水基材料科技有限公司 Master batch with functions of toughening, chemical corrosion resistance and color matching and preparation method of master batch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0799857A2 (en) * 1996-04-03 1997-10-08 Shell Internationale Researchmaatschappij B.V. High impact polyphenylene ether/styrene resin/elastomer composition
CN102786761A (en) * 2012-08-20 2012-11-21 四川长虹格润再生资源有限责任公司 Modified high-impact polystyrene plastic
BR132013009953E2 (en) * 2013-04-24 2015-01-06 Gilberto Luiz Zanette FORMULATION OF RECYCLED THERMOPLASTIC COMPOSITE FOR PROFILE EXTRUSION, FORMULATION OF THERMOPLASTIC COMPOSITE FOR CO-EXTRUSION OF THESE PROFILES AND PROCESS FOR MANUFACTURING COMPOSITES
CN104788838A (en) * 2015-04-14 2015-07-22 安徽联科水基材料科技有限公司 Master batch with functions of toughening, chemical corrosion resistance and color matching and preparation method of master batch

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