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    • 4. 发明授权
    • Alkylaryl hydrophobically modified cellulose ethers
    • 烷基芳基疏水改性的纤维素醚
    • US5124445A
    • 1992-06-23
    • US701756
    • 1991-05-17
    • Ernst K. JustThomas G. MajewiczArjun C. Sau
    • Ernst K. JustThomas G. MajewiczArjun C. Sau
    • C08B11/193C08L1/28C09D7/00C09D131/02
    • C09D7/002C08B11/193C09D131/02C08L1/30
    • Cellulose ethers are disclosed which have sufficient nonionic substitution to render them water soluble and which are further modified with a C.sub.10 to C.sub.24 long chain alkylaryl group in an amount between 0.2% by weight and the amount which makes them less than 1% by weight soluble in water. Hydroxyethylcellulose is a preferred water soluble cellulose ether for modification according to the invention. These products exhibit substantially improved viscosifying effects compared to their unmodified cellulose ether counterparts, and provide good leveling and sag resistance in latex paints. Preferred alkylaryl groups are nonylphenyl, dodecylphenyl, and dinonylphenyl. Included are cellulose ethers with spacer groups of various lengths between the alkylaryl group and the connecting group to the cellulose molecule.
    • 公开了具有足够的非离子取代使其具有水溶性的纤维素醚,并进一步用C10至C24长链烷基芳基改性,其量为0.2重量%,使其小于1重量% 水。 羟乙基纤维素是根据本发明的用于改性的优选的水溶性纤维素醚。 与其未改性的纤维素醚对应物相比,这些产品显示出显着改善的粘度效果,并且在乳胶漆中提供良好的流平和抗流挂性。 优选的烷基芳基是壬基苯基,十二烷基苯基和二壬基苯基。 包括在烷基芳基和与纤维素分子的连接基团之间具有各种长度的间隔基团的纤维素醚。