# US 10,767,021 B2 · Cut sheet and method for reducing cuts

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- Number: US 10,767,021 B2
- Document ID: US10767021B2
- Status: Granted
- Kind: B2
- Application number: 16/077,152
- Filed: 2017-02-08
- Published: 2019-02-14
- Granted: 2020-09-08
- Earliest claimed: 2016-02-10
- Assignees: Tbm Co., Ltd.
- Applicants: Tbm Co., Ltd.
- Inventors: Yuichiro Sumi
- Web page: https://patentgrep.com/patent/US10767021B2

## CPC

- C08J 5/18: Manufacture of films or sheets
- B26D 3/00: Cutting work characterised by the nature of the cut made; Apparatus therefor
- B26D 7/08: Means for treating work or cutting member to facilitate cutting (tensioning band cutters B26D1/48)
- C08J 7/042: {with two or more layers, where at least one layer of a composition contains a polymer binder}
- C08J 9/00: Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof (mechanical aspects of shaping of plastics or substances in a plastic state for the production of porous or cellular articles B29C)
- C08K 3/26: Carbonates; Bicarbonates
- C08J 2323/12: Polypropene
- C08J 2433/04: esters
- C08J 2475/04: Polyurethanes
- C08K 2003/265: {Calcium, strontium or barium carbonate}
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- B26D: CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING (for growing crops or plants A01D, A01G; for fodder or straw A01F; for bulk butter A01J; for dough A21C; slaughtering A22B; for tobacco, cigars or cigarettes A24; marking-out, perforating or making buttonholes A41H25/00; manufacturing footwear A43D; brushmaking A46D; surgery A61B; disintegrating, mincing or shredding in general B02C; cutting wire, making pins or nails B21F, B21G; of the kind used formetal B23; cutting by abrasive fluid jets B24C5/02; hand-held cutting tools B26B; perforating, cutting-out, stamping-out or punching, or severing by means other than cutting B26F; for wood B27; for stone B28D; working of plastics or substances in a plastic state B29; making boxes, cartons, envelopes or bags, of paper or similarly worked materials, e.g. metal foil, B31B; article or web delivery apparatus incorporating cutting or line-perforating devices B65H35/00; for leather or upholstery B68, C14B; for glass C03B; making matches C06F; for peat C10F; for sugar C13B45/00; for textile materials D06H; civil engineering, building, mining, see Section E; for light guides G02B6/25; cutting processed photographic material G03D15/04)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Provided is a cut sheet having sufficient water resistance and having fewer sharp protrusions in the end face despite including a large amount of inorganic particles and a method of reducing cuts. The cut sheet is formed of a resin composition including inorganic particles of 50% by mass or larger relative to the total mass of the composition and a thermoplastic resin. The cut sheet has a water absorption rate of 10% or lower measured in accordance with JIS K-7209. The actual occupancy rate of the exposed area of the inorganic particles is lower by at least 2% than the theoretical occupancy rate of the area of the inorganic particles in at least one end face.

## Claims

### Claim 1

A cut sheet that is formed of a resin composition including inorganic particles of 50% by mass or larger relative to a total mass of the composition and a thermoplastic resin, wherein
the cut sheet has a water absorption rate of 10% or lower measured in accordance with JIS K-7209, and
an actual occupancy rate of an exposed area of inorganic particles is lower by at least 2% than a theoretical occupancy rate of an area of inorganic particles in at least one end face.

### Claim 2 (depends on 1)

The cut sheet according to claim 1, wherein a cured film of a resin composition including a synthetic resin and/or a natural resin is formed on one surface or both surfaces of the cut sheet as a separate body from the cut sheet.

### Claim 3 (depends on 1)

The cut sheet according to claim 1, wherein the cut sheet has a size of B3 size defined in JIS P0138 or smaller.

### Claim 4 (depends on 1)

The cut sheet according to claim 1, wherein the cut sheet is used for reducing generation of cuts.

### Claim 5

A method for reducing cuts generated by a cut sheet, the method comprising:
setting an actual occupancy rate of an exposed area of inorganic particles lower than a theoretical occupancy rate of an area of inorganic particles in at least one end face in the cut sheet formed of a resin composition including the inorganic particles of 50% by mass or larger relative to a total mass of the composition and a thermoplastic resin,
wherein the inorganic particles are calcium carbonate and have an average particle diameter of 0.1 μm to 50 μm, and
the thermoplastic resin comprises at least one selected from the group consisting of polypropylene and polyethylene.

### Claim 6

A method for reducing cuts generated by a cut sheet, the method comprising:
covering at least a part of surfaces of inorganic particles with a thermoplastic resin in at least one end face in the cut sheet formed of a resin composition including the inorganic particles of 50% by mass or larger relative to a total mass of the composition and the thermoplastic resin,
wherein the inorganic particles are calcium carbonate and have an average particle diameter of 0.1 μm to 50 μm, and
the thermoplastic resin comprises at least one selected from the group consisting of polypropylene and polyethylene.