Patent ID: 7993569
Filing Date: 2011-08-09
Classification: B29B,B29C,B29K,B29L,C08J,C08K,C08L

Abstract:
1. A method of manufacturing transparent heat-resistant mould articles made of PET polyesters, wherein a mixture comprising: (1) 100 parts by weight of PET polyester (a) whose melt flow rate (MFR, JIS method: 280° C., 2.16 Kg in load) is 45-130 g/10 minutes; (2) 1-10 part(s) by weight of coupling agent master batch (f) comprising: (3) 0.05-2 parts by weight of coupling reaction catalyst (g) which is metal salts of carboxylic acids; is melted at a temperature over the melting point, and then reacted homogeneously with degassing and dehydrating in vacuo (13.3×10 3 Pa or less) in a reaction-extruder to obtain PET polyester whose MFR is 40 g/10 minutes or less, and the resulting PET polyester is moulded into a transparent amorphous sheet or board, which then is heated by rapid heating with a heater temperature of 200-500° C. to a surface temperature of 120-150° C. to become a transparent and crystallized sheet; then the sheet is vacuum-, pressure-, or vacuum-pressure-formed in a female mold with a closing time of 3-10 seconds/shot.