2023年7月25日发(作者：)

专利内容由知识产权出版社提供专利名称：Acrylic oligomers as melt flow modifiers ofthermoplastic coatings and powders发明人：Andrew Mercurio,Sheldon N. Lewis申请号：US05/575323申请日：19750507公开号：US04023977A公开日：19770517摘要：The application discloses a mixture of high molecular weight hard resins such aspolymethyl methacrylate, cellulose acetate butyrate, and cellulose nitrate containing aminor proportion of a very viscous or solid oligomer of one or more vinyl monomers suchas methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, tertiary butylmethacrylate, isobutyl methacrylate, or tertiary butyl acrylate, which monomers whenpolymerized give a polymer which has a glass transition temperature calculated by theformula used for high molecular weight polymers to be at least 30° C., and preferably atleast 50° C. The oligomers have a number averaging chain length of 4 to 25 mers. Theyhave a narrow molecular weight distribution such that the ratio of the weight averagemolecular weight to the number average molecular weight is 2 or less, preferably lessthan 1.5. This ratio is referred to as the heterogeneity index. The oligomers are used tolower the melting point and improve the flow of the high molecular weight polymers andyet do this without excessively plasticizing the hard polymers to a point where they arenoticeably softened at the use temperatures as contrasted with fluid oligomers andoligomers of "soft" monomers such as butyl acrylate, ethylhexyl acrylate, ethyl acrylate,octyl acrylate, and lauryl methacrylate. The mixture is useful for coatings applied in theform of a powder, solution, or dispersion. Molded and cast articles can also be made. Asused herein, "thermoplastic" includes thermosetting resins which go through athermoplastic flowable stage before becoming thermoset.申请人：ROHM AND HAAS COMPANY代理人：Harold L. Greenwald,Robert A. Doherty更多信息请下载全文后查看