摘要:
The present invention relates to a cascade process for the preparation of a graft copolymer comprising a polyolefin main chain and one or a multiple polymer side chains. The process comprising step A) of copolymerizing at least one first type of olefin monomer and at least one second type of metal-pacified functionalized olefin monomer using a catalyst system to obtain a polyolefin main chain having one or multiple metal-pacified functionalized short chain branches, the catalyst system comprising: i) a metal catalyst or metal catalyst precursor comprising a metal from Group 3-10 of the IUPAC Periodic Table of elements; and ii) optionally a co-catalyst; and step B) of forming one or multiple polymer side chains on the polyolefin main chain having one or multiple metal-pacified functionalized short chain branches to obtain the graft copolymer.
摘要:
Polycarbonates made from polyhydric phenols that preferably exhibit estrogenic activity less than bisphenol S exhibit properties such as high impact strengths, moderate to high glass transition temperatures, chemical resistance, and good color and clarity similar to conventional BPA-derived polycarbonates.
摘要:
Provided is a method of preparing poly(alkylene carbonate) using a molecular weight regulator in a process of preparing a copolymer of carbon dioxide/epoxide using a novel complex synthesized from salen-type ligand including a quaternary ammonium salt as a catalyst. According to the present invention, even though the molecular weight regulator is used, an activity of the catalyst may be stably maintained, whereby the low molecular weight of poly(alkylene carbonate) having a desirable level may be effectively provided. In addition, it is expected that since the novel complex as the catalyst of the present invention has a simple structure as compared to the existing copolymerization catalyst, due to the economical preparation cost thereof, the novel complex may be effectively applied to a large-scale commercial process.
摘要:
The invention relates to a method for the synthesis of acylglycerol oligomers, characterised in that it comprises reacting: at least one precursor selected from the group formed by cyclic carbonic esters of α/α'-acylglycerol having general formula (IV) (Formula); at least one metal catalyst selected from the group formed by metal cation salts, organometallic compounds and metal oxides; and at least one organic primer selected from the group formed by hydroxyl organic compounds, at a reaction temperature below 220° C.
摘要:
The invention is to provide polycarbonate resins having excellent light resistance, transparency, hue, heat resistance, thermal stability, and mechanical strength and to provide processes for efficiently and stably producing a polycarbonate resin which stably shows those performances. The invention includes: polycarbonate resins which at least contain structural units derived from a dihydroxy compound having the portion represented by the following general formula (1) as part of the structure thereof and which have specific properties; and processes for producing the polycarbonate resins. (The case where the portion represented by general formula (1) is part of -CH 2 -O-H is excluded.)
摘要:
The invention is to provide a polycarbonate resin having excellent light resistance, transparency, hue, heat resistance, thermal stability, and mechanical strength. The invention relates to a polycarbonate resin composition which includes a polycarbonate resin at least containing structural units derived from a dihydroxy compound having the portion represented by the following general formula (1) as part of the structure thereof, the polycarbonate resin composition giving a molded object having a thickness of 3 mm which has a haze, as measured in accordance with JIS K7105, of 12 or less after having undergone a 1,200-hour irradiation treatment with a sunshine carbon arc lamp through a type-A glass filter in accordance with JIS B7753 in an environment having a black panel temperature of 63°C, a relative humidity of 50%, and a rainfall spray period per hour of 12 minutes at a discharge voltage of 50 V and a discharge current of 60 A. (The case where the portion represented by the general formula (1) is part of -CH 2 -O-H is excluded.)