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US 11,007,699 B2Granted
Method of producing film, method of producing separator, and method of producing plasticizer
AssigneeSumitomo Chemical Company, Limited
InventorsDaizaburo Yashiki, Shinichi Yamate
Life of this patent
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Abstract
A method of producing a film in accordance with an aspect of the present invention includes: a first kneading and forming step of forming a composition obtained by kneading a polyolefin resin and a plasticizer; a stretching step of stretching the composition; a composition cleaning step of immersing the composition in a cleaning solvent and removing the plasticizer; a separation step of separating, from the cleaning solvent which has been used in the cleaning step, the plasticizer which has been eluted in the cleaning solvent; and a second kneading and forming step of forming a composition obtained by kneading a polyolefin resin and the plasticizer which has been separated in the separation step.
Claims17
A method of producing a film comprising:
- a first kneading step comprising kneading at least a first polyolefin resin and a plasticizer to form a first composition;
- a first forming step comprising forming the first composition into a first film composition;
- a stretching step comprising at least uniaxially stretching the first film composition;
- an elution step comprising immersing, in a cleaning solvent, the first film composition which has been stretched, and eluting the plasticizer from the first film composition to form a microporous film;
- a separation step comprising separating, from the cleaning solvent which has been used in the elution step, the plasticizer which has been eluted in the cleaning solvent;
- a second kneading step comprising kneading at least a second polyolefin resin and the plasticizer which has been separated in the separation step to form a second composition;
- a second forming step comprising forming the second composition into a second film composition;
- and
- a collection step comprising collecting an amount of the plasticizer which has volatilized from the first composition or the first film composition in at least one of the first kneading step, the first forming step and the stretching step.
6 more elements
A method of producing a film comprising:
- a first kneading step comprising kneading at least a first polyolefin resin and a plasticizer to form a first composition;
- a first forming step comprising forming the first composition into a first film composition;
- a stretching step comprising at least uniaxially stretching the first film composition, wherein an amount of the plasticizer is released from either the first composition or the first film composition in at least one of the first kneading step, the first forming step and the stretching step;
- an elution step comprising immersing, in a cleaning solvent, the first film composition which has been stretched, and eluting the plasticizer from the first film composition to form a microporous film;
- a collection step comprising collecting an amount of the plasticizer which has volatilized from the first composition or the first film composition in at least one of the first kneading step, the first forming step and the stretching step;
- a second kneading step comprising kneading at least a second polyolefin resin and the plasticizer which has been collected in the collection step to form a second composition;
- and
- a second forming step comprising forming the second composition into a second film composition.
5 more elements
A method of producing a film comprising:
- a first kneading step comprising kneading at least a first polyolefin resin and a plasticizer to form a first composition;
- a first forming step comprising forming the first composition into a first film composition;
- a stretching step comprising at least uniaxially stretching the first film composition;
- an elution step comprising immersing, in a cleaning solvent, the first film composition which has been stretched, and eluting the plasticizer from the first film composition to form a microporous film;
- a collection step comprising collecting an amount of the plasticizer which has volatilized from the first composition or the first film composition in at least one of the first kneading step, the first forming step and the stretching step;
- a second kneading step comprising kneading at least a second polyolefin resin and the plasticizer which has been collected in the collection step to form a second composition;
- and
- a second forming step comprising forming the second composition into a second film composition.
5 more elements
A method of producing a plasticizer comprising:
- a first kneading step comprising kneading at least a first polyolefin resin and a plasticizer to form a first composition;
- a first forming step comprising forming the first composition into a first film composition;
- a stretching step comprising at least uniaxially stretching the first film composition;
- an elution step comprising immersing, in a cleaning solvent, the first film composition which has been stretched, and eluting the plasticizer from the first film composition to form a microporous film;
- a separation step comprising separating, from the cleaning solvent which has been used in the elution step, the plasticizer which has been eluted in the cleaning solvent;
- and
- a collection step comprising collecting an amount of the plasticizer which has volatilized from the first composition or the first film composition in at least one of the first kneading step, the first forming step and the stretching step.
4 more elements
A method of producing a plasticizer comprising:
- a first kneading step comprising kneading at least a first polyolefin resin and a plasticizer to form a first composition;
- a first forming step comprising forming the first composition into a first film composition;
- a stretching step comprising at least uniaxially stretching the first film composition, wherein an amount of the plasticizer is released from either the first composition or the first film composition in at least one of the first kneading step, the first forming step and the stretching step;
- an elution step comprising immersing, in a cleaning solvent, the first film composition which has been stretched, and eluting the plasticizer from the first film composition to form a microporous film;
- and
- a collection step comprising collecting an amount of the plasticizer which has volatilized from the first composition or the first film composition in at least one of the first kneading step, the first forming step and the stretching step.
3 more elements
A method of producing a plasticizer comprising:
- a first kneading step comprising kneading at least a first polyolefin resin and a plasticizer to form a first composition;
- a first forming step comprising forming the first composition into a first film composition;
- a stretching step comprising at least uniaxially stretching the first film composition;
- an elution step comprising immersing, in a cleaning solvent, the first film composition which has been stretched, and eluting the plasticizer from the first film composition to form a microporous film;
- and
- a collection step comprising collecting an amount of the plasticizer which has volatilized from the first composition or the first film composition in at least one of the first kneading step, the first forming step and the stretching step.
3 more elements
Dependencies are inferred from the claim text.