US-12625443-B2 - Toner seal member and toner cartridge

Abstract

Provided is a toner seal member having excellent performance. A toner seal member ( 10 ) includes a foam layer ( 20 ) and a coating layer ( 30 ), and the coating layer ( 30 ) is exposed. The coating layer ( 30 ) is produced using a polyol, an isocyanate, and a photopolymerizable monomer having a hydroxyl group as raw materials.

Inventors

• Kento UCHIDA
• Takuya KIRIYAMA

Assignees

• INOAC CORPORATION
• INOAC SLIMFLEX CO., LTD.

Dates

Publication Date

20260512

Application Date

20230606

Priority Date

20220621

Claims (9)

1. 1 . A toner seal member comprising a foam layer and a coating layer, the coating layer being exposed, wherein the coating layer is produced using a polyol, an isocyanate, and a photopolymerizable monomer having a hydroxyl group as raw materials.
2. 2 . The toner seal member according to claim 1 , wherein the coating layer is formed by applying the raw materials of the coating layer to the foam layer and curing the raw materials.
3. 3 . The toner seal member according to claim 1 , wherein the polyol contains a polycarbonate polyol.
4. 4 . The toner seal member according to claim 1 , wherein the foam layer is selected from a polyethylene foam, a polypropylene foam, a polystyrene foam, a polyamide foam, a polyethylene terephthalate (PET) foam, a polybutylene terephthalate (PBT) foam, a (meth)acrylic foam, a phenol foam, a polyvinyl chloride foam, a polyimide foam, a silicone resin foam, a urea resin foam, a melamine resin foam, an ethylene propylene diene rubber (EPDM) foam, a styrene-butadiene rubber (SBR) foam, a nitrile butadiene rubber (NBR) foam, an ethylene-vinyl acetate copolymer (EVA) foam, an ethylene-acrylic acid copolymer foam, and an ethylene-ethyl acrylate copolymer (EEA) foam.
5. 5 . A toner cartridge comprising the toner seal member according to claim 1 .
6. 6 . A method for producing a toner seal member including a foam layer and a coating layer, the coating layer being exposed, wherein the coating layer is produced using a polyol, an isocyanate, and a photopolymerizable monomer having a hydroxyl group as raw materials, the method comprising: an attachment step of attaching the raw materials of the coating layer to the foam layer; and an irradiation step of irradiating the raw materials attached in the attachment step with light to cure the raw materials through a photopolymerization reaction, the raw materials of the coating layer including no organic solvent.
7. 7 . The toner seal member according to claim 2 , wherein the polyol contains a polycarbonate polyol.
8. 8 . The toner seal member according to claim 2 , wherein the foam layer is selected from a polyethylene foam, a polypropylene foam, a polystyrene foam, a polyamide foam, a polyethylene terephthalate (PET) foam, a polybutylene terephthalate (PBT) foam, a (meth)acrylic foam, a phenol foam, a polyvinyl chloride foam, a polyimide foam, a silicone resin foam, a urea resin foam, a melamine resin foam, an ethylene propylene diene rubber (EPDM) foam, a styrene-butadiene rubber (SBR) foam, a nitrile butadiene rubber (NBR) foam, an ethylene-vinyl acetate copolymer (EVA) foam, an ethylene-acrylic acid copolymer foam, and an ethylene-ethyl acrylate copolymer (EEA) foam.
9. 9 . A toner cartridge comprising the toner seal member according to claim 2 .

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application is a National Stage of International Application No. PCT/JP2023/020986 filed Jun. 6, 2023, claiming priority based on Japanese Patent Application No. 2022-099822 filed Jun. 21, 2022. TECHNICAL FIELD The present disclosure relates to a toner seal member and a toner cartridge. BACKGROUND ART Patent Literature 1 discloses a seal member including a sheet-like elastic member and a coating layer. Patent Literature 2 discloses a toner seal member including a urethane foam layer and a urethane film layer. CITATIONS LIST Patent Literature Patent Literature 1: JP 2002-214895 APatent Literature 2: JP 2009-265425 A SUMMARY OF INVENTION Technical Problems In recent years, a toner seal member has been required to have various performances, and the demands for the performance have become severe. An object of the present disclosure is to provide a toner seal member having excellent performance. The present disclosure can be implemented in the following forms. Solutions to Problems [1] A toner seal member including a foam layer and a coating layer, the coating layer being exposed, wherein the coating layer is produced using a polyol, an isocyanate, and a photopolymerizable monomer having a hydroxyl group as raw materials. Advantageous Effects of Invention The present disclosure can provide a toner seal member having excellent performance. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a sectional view of a toner seal member according to an embodiment. FIG. 2 is a partial sectional view of the toner cartridge according to the embodiment when a discharge port is in a closed state. FIG. 3 is a partial sectional view of the toner cartridge of FIG. 2 when the discharge port is in an open state. DESCRIPTION OF EMBODIMENT Here, a desirable example of the present disclosure will be described. [2] A toner cartridge including the toner seal member according to [1]. Hereinafter, the present disclosure will be described in detail. In the description using “to” for a numerical range of the present specification, the lower limit and the upper limit are included unless otherwise specified. For example, the expression “10 to 20” includes both the lower limit value “10” and the upper limit value “20”. That is, “10 to 20” has the same meaning as “10 or more and 20 or less”. 1. Toner Seal Member FIG. 1 is sectional view of a toner seal member 10 according to an embodiment. The toner seal member 10 includes a foam layer 20 and a coating layer 30. In the toner seal member 10, the coating layer 30 is exposed. For example, the toner seal member 10 is a laminated body of the foam layer 20 and the coating layer 30. For example, the coating layer 30 is a skin layer. [Foam Layer] The foam layer 20 is made of, for example, a synthetic resin foam. Examples of the foam layer 20 includes synthetic resin foams such as polyurethane foams; polyolefin foams including polyethylene foams and polypropylene foams; polystyrene foams; polyamide foams; polyester foams including polyethylene terephthalate (PET) foams and polybutylene terephthalate (PBT); (meth)acrylic foams; phenol foams; polyvinyl chloride foams; polyimide foams; silicone resin foams; urea resin foams; melamine resin foams; ethylene propylene diene rubber (EPDM) foams; styrene-butadiene rubber (SBR) foams; nitrile butadiene rubber (NBR) foams; ethylene-vinyl acetate copolymer (EVA) foams; ethylene-acrylic acid copolymer foams; and ethylene-ethyl acrylate copolymer (EEA) foams. Among these foams, polyurethane foams are more preferable from the viewpoint of adhesion to the coating layer. [Coating Layer] The coating layer 30 is produced using a polyol, an isocyanate, and a photopolymerizable monomer having a hydroxyl group as raw materials. The coating layer 30 can be produced on a surface of the foam layer 20 using a composition containing a urethane prepolymer obtained by reacting a polyol, isocyanate, and a photopolymerizable monomer having a hydroxyl group. The urethane prepolymer is a urethane prepolymer having a photoreactive group at a terminal and containing a polyester bond in a polymer skeleton. Here, the photoreactive group is a functional group that can be crosslinked through irradiation with X-rays, electron beams, ultraviolet rays, visible rays, or the like. More specifically, the urethane prepolymer is obtained by reacting a reactant of a polyisocyanate and a polyol with a photoreactive group-containing compound (compound having a photoreactive group capable of reacting with a terminal of the reactant). Hereinafter, various raw materials used in producing the urethane prepolymer will be described. [Polyol] The polyol is not particularly limited. The polyol preferably contains at least one of a polyester polyol and a polycarbonate polyol. Examples of the polyester polyol include: a polyester polyol obtained through a dehydration condensation reaction of an aliphatic dicarboxylic acid (for example, succinic acid, adipic acid, sebacic acid,