# US 11,999,081 B2 · Method for producing pellets, method for producing resin molded article, and pellets

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- Number: US 11,999,081 B2
- Document ID: US11999081B2
- Status: Granted
- Kind: B2
- Application number: 16/344,175
- Filed: 2017-10-18
- Published: 2019-09-19
- Granted: 2024-06-04
- Earliest claimed: 2016-11-17
- Assignees: Tbm Co., Ltd.
- Applicants: Tbm Co., Ltd.
- Inventors: Yuichiro Sumi; Shigeki Kuroki
- Web page: https://patentgrep.com/patent/US11999081B2

## CPC

- B29B 7/48: with intermeshing devices, e.g. screws
- B29B 7/90: Fillers or reinforcements {, e.g. fibres}
- B29B 7/007: {for continuous mixing}
- B29B 9/06: in the form of filamentary material, e.g. combined with extrusion
- B29B 9/12: characterised by structure or composition
- C08K 3/26: Carbonates; Bicarbonates
- C08L 23/00: Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L 23/02: not modified by chemical after-treatment
- B29B 7/183: {having a casing closely surrounding the rotors, e.g. of Banbury type (with single shaft B29B7/125)}
- B29B 7/42: with screw or helix
- C08K 2003/265: {Calcium, strontium or barium carbonate}
- B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Provided are a method for producing pellets that are easy to be uniformly molded at the time of using the pellet for molding even when the pellets include a large amount of inorganic substance particles, the pellets, and a method for molding a resin molded article. The method for producing pellets according to the present invention includes a method for producing pellets formed from a resin composition including a crystalline macromolecule and an inorganic fine powder or organic fine powder in a mass ratio of 50:50 to 20:80, the method including the step of kneading the crystalline macromolecule and the inorganic fine powder or the organic fine powder so that the microcrystalline size of the crystalline macromolecule is 190 Å or smaller. The pellets according to the present invention are pellets formed from a resin composition including a crystalline macromolecule having a microcrystalline size of 190 Å or smaller, and inorganic substance particles in a mass ratio of 50:50 to 20:80.

## Claims

### Claim 1

A method for producing pellets formed from a resin composition including a crystalline macromolecule and an inorganic fine powder in a mass ratio of 50:50 to 20:80, the method comprising the step of:
kneading the crystalline macromolecule and the inorganic fine powder at a temperature that is at least 45° C. higher than a melting point of the crystalline macromolecule so that the crystalline macromolecule has a microcrystalline size of 190 Å or smaller,
wherein an average particle diameter of the inorganic fine powder is 50 μm or smaller.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the crystalline macromolecule includes a polypropylene resin or a polyethylene resin.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the inorganic fine powder includes calcium carbonate particles.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the pellets are molded by the kneading at the temperature equal to or higher than a temperature at which the microcrystalline size of the crystalline macromolecule is 190 Å or smaller.

### Claim 5 (depends on 1)

A method for producing a resin molded article, the method comprising steps of:
producing the pellets by the method for producing pellets according to claim 1; and
molding the pellets into the resin molded article.