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公开(公告)号：US11407877B2
公开(公告)日：2022-08-09
申请号：US17288896
申请日：2019-10-25
Applicant: POLYSTYVERT INC.
Inventor： Roland Côté
Abstract: There are provided processes for recycling waste such as polystyrene thermoplastic polymer waste and/or polystyrene thermoplastic copolymer waste as well as recycled polystyrene thermoplastic polymer and/or recycled thermoplastic copolymer that may, for example, be obtained from such processes. The processes can comprise dissolving the waste in cymene, xylene or ethylbenzene or a suitable solvent, to obtain a mixture followed by heating the mixture under acidic conditions and then optionally neutral conditions in the presence of a reducing agent then cooling to obtain a supernatant comprising polystyrene thermoplastic polymer and/or polystyrene thermoplastic copolymer and a solid waste residue. The supernatant can optionally be treated with a filtration aid, then the supernatant can be contacted with a hydrocarbon polystyrene non-solvent under conditions to obtain precipitated polystyrene thermoplastic polymer and/or precipitated polystyrene thermoplastic copolymer which can be washed with additional hydrocarbon polystyrene non-solvent, and optionally dried and formed into polystyrene thermoplastic polymer pellets and/or polystyrene thermoplastic copolymer pellets.
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公开(公告)号：US20250154332A1
公开(公告)日：2025-05-15
申请号：US18965746
申请日：2024-12-02
Applicant: POLYSTYVERT INC.
Inventor： Roland CÔTÉ
Abstract: There are provided processes for recycling polystyrene waste. Recycled polystyrenes are also disclosed. For example, the recycled polystyrene can comprise a non-solvent having a boiling point at 1 atm of pressure of from 98° C. to 110° C.; and ethylbenzene.
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公开(公告)号：US12275824B2
公开(公告)日：2025-04-15
申请号：US17857028
申请日：2022-07-03
Applicant: POLYSTYVERT INC.
Inventor： Roland Côté
Abstract: There are provided recycled polystyrene polymers having a melt flow index of less than about 25 g/10 min. There are provided processes for recycling polystyrene waste. The processes can comprise dissolving said polystyrene waste in p-cymene under conditions to obtain a polystyrene/p-cymene mixture, adding the polystyrene/p-cymene mixture to a hydrocarbon polystyrene non-solvent under conditions to obtain precipitated polystyrene and washing the precipitated polystyrene with additional portions of hydrocarbon polystyrene non-solvent under conditions to obtain twice-washed polystyrene. The twice-washed polystyrene can optionally be dried and formed into polystyrene pellets. There is also provided recycled polystyrene obtained from such processes for recycling polystyrene waste.
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公开(公告)号：US20230303798A1
公开(公告)日：2023-09-28
申请号：US18144924
申请日：2023-05-09
Applicant: POLYSTYVERT INC.
Inventor： Roland CÔTÉ
CPC classification number: C08J11/08 , B29B17/02 , B29B2017/0293 , C08J2325/06
Abstract: There are provided processes for recycling polystyrene waste. The processes can comprise dissolving said polystyrene waste in ethylbenzene under conditions to obtain a polystyrene/ethylbenzene mixture, adding the polystyrene/ethyl benzene mixture to a hydrocarbon polystyrene non-solvent under conditions to obtain precipitated polystyrene and washing the precipitated polystyrene with additional portions of hydrocarbon polystyrene non-solvent under conditions to obtain twice-washed polystyrene. The twice-washed polystyrene can optionally be dried and formed into polystyrene pellets. There is also provided recycled polystyrene obtained from such processes for recycling polystyrene waste.
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公开(公告)号：US20220073696A1
公开(公告)日：2022-03-10
申请号：US17353395
申请日：2021-06-21
Applicant: POLYSTYVERT INC.
Inventor： Roland CÔTÉ
IPC: C08J11/08 , B29B17/02 , C08F112/08 , C08L25/06
Abstract: There are provided recycled polystyrene polymers having a melt flow index of less than about 25 g/10 min. There are provided processes for recycling polystyrene waste. The processes can comprise dissolving said polystyrene waste in p-cymene under conditions to obtain a polystyrene/p-cymene mixture, adding the polystyrene/p-cymene mixture to a hydrocarbon polystyrene non-solvent under conditions to obtain precipitated polystyrene and washing the precipitated polystyrene with additional portions of hydrocarbon polystyrene non-solvent under conditions to obtain twice-washed polystyrene. The twice-washed polystyrene can optionally be dried and formed into polystyrene pellets. There is also provided recycled polystyrene obtained from such processes for recycling polystyrene waste.
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Patent Agency Ranking
公开(公告)号：US12173122B2
公开(公告)日：2024-12-24
申请号：US18144924
申请日：2023-05-09
Applicant: POLYSTYVERT INC.
Inventor： Roland Côté
Abstract: There are provided processes for recycling polystyrene waste. The processes can comprise dissolving said polystyrene waste in ethylbenzene under conditions to obtain a polystyrene/ethylbenzene mixture, adding the polystyrene/ethyl benzene mixture to a hydrocarbon polystyrene non-solvent under conditions to obtain precipitated polystyrene and washing the precipitated polystyrene with additional portions of hydrocarbon polystyrene non-solvent under conditions to obtain twice-washed polystyrene. The twice-washed polystyrene can optionally be dried and formed into polystyrene pellets. There is also provided recycled polystyrene obtained from such processes for recycling polystyrene waste.
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公开(公告)号：US20210179802A1
公开(公告)日：2021-06-17
申请号：US17184593
申请日：2021-02-25
Applicant: POLYSTYVERT INC.
Inventor： Roland CÔTÉ
Abstract: There is provided a composition for the production of a recycled polystyrene. The composition comprises polystyrene, ethylbenzene and a non-solvent having a boiling point at 1 atm of pressure of from 98° C. to 110° C. There is also provided a method of using ethylbenzene and a non-solvent having a boiling point at 1 atm of pressure of from 98° C. to 110° C. The method comprises mixing together the ethylbenzene, the non-solvent and polystyrene for recycling the polystyrene.
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公开(公告)号：US20200165407A1
公开(公告)日：2020-05-28
申请号：US16699386
申请日：2019-11-29
Applicant: POLYSTYVERT INC.
Inventor： Roland CÔTÉ
IPC: C08J11/08 , C08L25/06 , C08F112/08 , B29B17/02
Abstract: There are provided recycled polystyrene polymers having a melt flow index of less than about 25 g/10 min. There are provided processes for recycling polystyrene waste. The processes can comprise dissolving said polystyrene waste in p-cymene under conditions to obtain a polystyrene/p-cymene mixture, adding the polystyrene/p-cymene mixture to a hydrocarbon polystyrene non-solvent under conditions to obtain precipitated polystyrene and washing the precipitated polystyrene with additional portions of hydrocarbon polystyrene non-solvent under conditions to obtain twice-washed polystyrene. The twice-washed polystyrene can optionally be dried and formed into polystyrene pellets. There is also provided recycled polystyrene obtained from such processes for recycling polystyrene waste.
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公开(公告)号：US20170298207A1
公开(公告)日：2017-10-19
申请号：US15515817
申请日：2015-10-05
Applicant: POLYSTYVERT INC.
Inventor： Roland CÔTÉ
Abstract: There are provided recycled polystyrene polymers having a melt flow index of less than about 25 g/10 min. There are provided processes for recycling polystyrene waste. The processes can comprise dissolving said polystyrene waste in p-cymene under conditions to obtain a polystyrene/p-cymene mixture, adding the polystyrene/p-cymene mixture to a hydrocarbon polystyrene non-solvent under conditions to obtain precipitated polystyrene and washing the precipitated polystyrene with additional portions of hydrocarbon polystyrene non-solvent under conditions to obtain twice-washed polystyrene. The twice-washed polystyrene can optionally be dried and formed into polystyrene pellets. There is also provided recycled polystyrene obtained from such processes for recycling polystyrene waste.
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公开(公告)号：US12281207B2
公开(公告)日：2025-04-22
申请号：US18708857
申请日：2022-11-11
Applicant: POLYSTYVERT INC.
Inventor： Roland Cöté , Jean-Mathieu Pin
IPC: C08J11/08
Abstract: The present disclosure relates to methods of removing brominated contaminants from polystyrene waste and recovering the brominated contaminants. The present disclosure further relates to methods of recycling polystyrene waste, wherein the recycling comprises retention of brominated contaminants or removal of contaminants. The present disclosure also relates to use of monocyclic aromatic benzenic solvents in the removal and/or recovery of brominated contaminants from polystyrene waste and in the recycling of polystyrene waste. Moreover, the present disclosure relates to use of the recovered brominated contaminants in the manufacture of polystyrene products such as insulation.
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