15-01-2015 дата публикации
Номер: US20150018511A1
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: 1. A method for producing a transparent thermoplastic resin pellet , the method comprising [{'br': None, 'i': 'tr', 'Damage history={Residence time ()}×{Shear rate (γ)}'}, {'br': None, 'i': tr', 'W×H×L', 'Q, 'Residence time ()=()/'}, {'br': None, 'i': D×N', 'H, 'Shear rate (γ)=(π×)/'}], '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 2,500wherein 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].2. The method of claim 1 , wherein the transparent thermoplastic resin is an aromatic polycarbonate.3. The method of claim 2 , wherein the aromatic polycarbonate has a viscosity average molecular weight (Mv) of from 11 claim 2 ,000 to 23 claim 2 ,000.4. The method of claim 1 , wherein the kneader is a twin-screw kneader.5. The method of claim 1 , wherein the kneader is equipped with a melt filter for removal of extraneous foreign matter.6. A transparent thermoplastic resin pellet produced by the method of .7. A method for reducing gels in a transparent thermoplastic resin pellet claim 1 , the method comprising [{'br': None, 'i': 'tr', 'Damage history={Residence time ()}×{Shear rate (γ)}'}, {'br': None, 'i': tr', 'W×H×L', 'Q, 'Residence time ()=()/'}, {'br': None, 'i': D×N', 'H, 'Shear rate (γ)=(π×)/'}], '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 2,500wherein W represents a screw groove width ( ...
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