Guangxin Lin

US Patent:

20190277785, Sep 12, 2019

Filed:

Dec 19, 2016

Appl. No.:

16/318637

Inventors:

- Bergen Op Zoom, NL
Shankar Kollengodu SUBRAMANIAN - Mount Vernon IN, US
James Franklin HOOVER - Mount Vernon IN, US
Guangxin LIN - Mount Vernon IN, US

International Classification:

G01N 24/08
C08G 64/16
C08G 64/24
C08G 64/42
C08G 63/91
C08G 63/64
G01N 33/44

Abstract:

An interfacial process for preparing a poly(aliphatic ester-carbonate) includes providing an initial polymerization reaction mixture comprising an aliphatic C6-20 dicarboxylic acid, a bisphenol, an alkali hydroxide, and optionally a catalyst in a solvent system comprising water and an immiscible organic solvent, adding an initial portion of a carbonyl dihalide over a first time period while maintaining the reaction at a first pH from 7 to 8; and adding a second portion of the carbonyl dihalide over a second, subsequent time period while maintaining the reaction pH at a second pH from 9 to 12, to provide a product polymerization mixture, wherein the amount of alkali hydroxide in the initial polymerization reaction mixture is effective to increase the fraction of the first time period at a measured pH of 7 to 8 compared to the same reaction mixture with a higher amount of alkali hydroxide in the initial polymerization mixture.

US Patent:

20190169376, Jun 6, 2019

Filed:

Jun 27, 2017

Appl. No.:

16/313389

Inventors:

- Bergen op Zoom, NL
Franklin Ehrensbeck - Evansville IN, US
Brett D. Ermi - Schenectady NY, US
Bing Zhou - Evansville IN, US
Guangxin Lin - Vernon IN, US
Roger W. Hurst - Mount Vernon IN, US

International Classification:

C08J 3/22
C08L 69/00
C08L 27/18
B29C 48/27

Abstract:

The disclosure concerns compositions and methods to improve remote phosphor optical properties in polycarbonate. One method includes combining a phosphor component and a polycarbonate component to form a phosphor-polycarbonate composition; and at a fixed phosphor concentration, combining the phosphor-polycarbonate composition with a diffusing agent comprising polytetrafluoroethylene (PTFE), wherein the diffusing agent diffuses light, and wherein the phosphor-polycarbonate composition exhibits an increase in chromaticity coordinate (CIEx) as determined by CIE 1931 or increase in CIE 1976 (u′,v′) of at least about 5% relative to a substantially similar reference composition in the absence of PTFE. Also described are methods to increase yield and reduce product accumulation of an extruded thermoplastic polycarbonate composition through the mixing of PTFE with a phosphor-polycarbonate (PCP) to form a PCP-PTFE component as well as a method forming a phosphor-polycarbonate master batch (PPCMB) composition, and during extrusion, adding PTFE to the PPCMB composition to form a PPCMB-PTFE composition.