Liquid absorbing sheet and nonaqueous electrolyte battery pack
First Claim
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1. A liquid absorbing sheet comprising a liquid absorbing resin layer, wherein the liquid absorbing resin layer is obtained by irradiating UV-rays onto a monomer composition to polymerize the monomer composition, the monomer composition containing:
- a monofunctional monomer component containing a monofunctional monomer capable of forming a homopolymer that is soluble in a nonaqueous solvent used in a nonaqueous electrolyte secondary battery; and
a polyfunctional monomer component;
wherein;
the nonaqueous solvent contains at least one of dimethyl carbonate, propylene carbonate and ethylene carbonate;
the monofunctional monomer is benzyl acrylate, N-vinyl-2-pyrrolidone, imide acrylate, acryloyl morpholine, phenoxyethyl acrylate, N,N-diethylacrylamide, methoxypolyethylene glycol acrylate, tetrahydrofurfuryl acrylate, or phenoxypolyethylene glycol acrylate;
the liquid absorbing resin layer has a crosslink density of 0.0001 to 0.17;
the monofunctional monomer is contained at 20 mol % in the monofunctional monomer component; and
the polyfunctional monomer component is selected from the group consisting of hydroxyl pivalic acid neopentyl glycol diacrylate, polyethylene glycol diacrylate (ethylene oxide-added mol number (n) =14), bisphenol A diacrylate, phenyl glycidyl ether acrylate, and hexamethylene diisocyanate urethane prepolymer.
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Abstract
A liquid absorbing sheet includes a liquid absorbing resin layer that can effectively absorb nonaqueous electrolyte solutions used in nonaqueous electrolyte secondary cells that make nonaqueous electrolyte battery packs (in particular, lithium ion-based nonaqueous secondary battery packs). The liquid absorbing resin layer is obtained by irradiating UV-rays onto a monomer composition to polymerize the monomer composition, the monomer composition containing:
- a monofunctional monomer component containing a monofunctional monomer capable of forming a homopolymer that is soluble in a nonaqueous solvent used in a nonaqueous electrolyte secondary battery; and
- a polyfunctional monomer component.
31 Citations
22 Claims
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1. A liquid absorbing sheet comprising a liquid absorbing resin layer, wherein the liquid absorbing resin layer is obtained by irradiating UV-rays onto a monomer composition to polymerize the monomer composition, the monomer composition containing:
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a monofunctional monomer component containing a monofunctional monomer capable of forming a homopolymer that is soluble in a nonaqueous solvent used in a nonaqueous electrolyte secondary battery; and a polyfunctional monomer component; wherein; the nonaqueous solvent contains at least one of dimethyl carbonate, propylene carbonate and ethylene carbonate; the monofunctional monomer is benzyl acrylate, N-vinyl-2-pyrrolidone, imide acrylate, acryloyl morpholine, phenoxyethyl acrylate, N,N-diethylacrylamide, methoxypolyethylene glycol acrylate, tetrahydrofurfuryl acrylate, or phenoxypolyethylene glycol acrylate; the liquid absorbing resin layer has a crosslink density of 0.0001 to 0.17; the monofunctional monomer is contained at 20 mol % in the monofunctional monomer component; and the polyfunctional monomer component is selected from the group consisting of hydroxyl pivalic acid neopentyl glycol diacrylate, polyethylene glycol diacrylate (ethylene oxide-added mol number (n) =14), bisphenol A diacrylate, phenyl glycidyl ether acrylate, and hexamethylene diisocyanate urethane prepolymer. - View Dependent Claims (3, 15, 17, 18, 19, 20, 21, 22)
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2. A liquid absorbing sheet comprising a liquid absorbing resin layer, wherein the liquid absorbing resin layer is obtained by irradiating UV-rays onto a monomer composition to polymerize the monomer composition, the monomer composition containing:
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a monofunctional monomer component containing a monofunctional monomer capable of forming a homopolymer that is soluble in a nonaqueous solvent used in a nonaqueous electrolyte secondary battery; and a polyfunctional monomer component; wherein a phosphate-based liquid flame retardant is bisphenol A bis(diphenyl)phosphate, hydroquinol bis(diphenyl)phosphate, phenyl dixylenyl phosphate, tricresyl phosphate, cresyl diphenyl phosphate, trixylenyl phosphate, xylenyl diphenyl phosphate, resorcinol bis(diphenyl)phosphate, or 2-ethylhexyl diphenyl phosphate and the phosphate-based liquid flame retardant is present in the monomer composition in an amount of 70 to 200 parts by weight with respect to 100 parts by weight of the monofunctional monomer component and the polyfunctional monomer component combined. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16)
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Specification