# US 9,751,990 B2 · Transparent thermoplastic resin pellet manufacturing method

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- Number: US 9,751,990 B2
- Document ID: US9751990B2
- Status: Granted
- Kind: B2
- Application number: 14/371,102
- Filed: 2012-12-21
- Published: 2015-01-15
- Granted: 2017-09-05
- Earliest claimed: 2012-01-10
- Assignees: Idemitsu Kosan Co., Ltd.
- Applicants: Idemitsu Kosan Co., Ltd.
- Inventors: Takayoshi Tanaka; Munehiro Chosa; Yasunobu Yamazaki
- Web page: https://patentgrep.com/patent/US9751990B2

## CPC

- C08J 3/005: {Processes for mixing polymers}
- B01F 27/1143: screw-shaped, e.g. worms
- B29B 7/002: {Methods (chemical aspects C08J3/00)}
- B29B 7/48: with intermeshing devices, e.g. screws
- B29B 7/489: {Screws (B29B7/482 takes precedence)}
- B29B 7/80: Component parts, details or accessories; Auxiliary operations (B29B7/22, B29B7/58 take precedence {; cleaning mixers B01F35/145})
- B29B 9/06: in the form of filamentary material, e.g. combined with extrusion
- B29B 9/12: characterised by structure or composition
- B29B 9/16: Auxiliary treatment of granules
- B29C 48/40: using two or more parallel screws {or at least two parallel non-intermeshing screws}, e.g. twin screw extruders
- B29C 48/625: characterised by the ratio of the threaded length of the screw to its outside diameter [L/D ratio]
- B29C 48/92: Measuring, controlling or regulating
- B01F 2101/2805: {Mixing plastics, polymer material ingredients, monomers or oligomers}
- B29K 2069/00: Use of PC, i.e. polycarbonates {or derivatives thereof}, as moulding material
- B29K 2995/0026: Transparent
- C08J 2369/00: Characterised by the use of polycarbonates; Derivatives of polycarbonates
- 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)
- B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06)
- 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
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS

## Abstract

A method for producing a transparent thermoplastic resin pellet comprising a step of kneading a transparent thermoplastic resin with a kneader under a condition under which a damage history calculated according to the following formula is 500 to 2,500: Damage history={Residence time (tr)}×{Shear rate (γ)} Residence time (tr)=(W×H×L)/Q Shear rate (γ)=(π×D×N)/H in the formulae, W represents a screw groove width (pitch) [cm]; H represents a screw groove depth [cm]; L represents a screw length [cm]; Q represents a resin supply amount [g/s]; D represents a screw diameter [cm]; and N represents a screw rotation number [rps].

## Claims

### Claim 1

A method for producing a transparent thermoplastic resin pellet, the method comprising
kneading a transparent thermoplastic resin with a kneader under a condition under which a damage history calculated according to the following formula is from 500 to 2,500 cm3/g:
Damage history={Residence time (tr)}×{Shear rate (γ)}
Residence time (tr)=(W×H×L)/Q
Shear rate (γ)=(π×D×N)/H
wherein W represents a screw groove width (pitch) [cm]; H represents a screw groove depth [cm]; L represents a screw length [cm]; Q represents a resin supply amount [g/s]; D represents a screw diameter [cm]; and N represents a screw rotation number [rps].

### Claim 2 (depends on 1)

The method of claim 1, wherein the transparent thermoplastic resin is an aromatic polycarbonate.

### Claim 3 (depends on 2)

The method of claim 2, wherein the aromatic polycarbonate has a viscosity average molecular weight (Mv) of from 11,000 to 23,000.

### Claim 4 (depends on 1)

The method of claim 1, wherein the kneader is a twin-screw kneader.

### Claim 5 (depends on 1)

The method of claim 1, wherein the kneader is equipped with a melt filter for removal of extraneous foreign matter.

### Claim 6 (depends on 1)

The method of claim 1 wherein the damage history is from 900 to 2,000 cm3/g.

### Claim 7 (depends on 1)

The method of claim 1 wherein the transparent thermoplastic resin is selected from the group consisting of a polyarylate resin, a polymethyl methacrylate resin, a polystyrene resin and a polycarbonate resin.

### Claim 8 (depends on 1)

The method of claim 1 wherein the transparent thermoplastic resin is a polycarbonate prepared from bisphenol A.