摘要:
Random and block copolyesters which are liquid crystalline can be formed containing: (a) alkoxy-substituted para-phenylene terephthalate groups (i.e., derived from an analogously substituted hydroquinone reagent); and (b) alkylene-terephthalate groups (e.g., where the alkylene moiety contains 2 to 10 carbon atoms).
摘要:
A copolymer of (1) a triad aromatic ester mesogenic unit containing a flexible polyalkylene spacer in the main chain thereof and (2) a polyester is disclosed.
摘要:
Novel liquid crystal polyesters can be formed by reaction of bis(hydroxyalkoxy)biphenyls (including the novel bis(2-hydroxybutoxy)biphenyl) with terephthaloyl chloride.
摘要:
Thermotropic liquid crystalline poly(ester-amide) compositions are disclosed which comprise a bis(4-carbonyl phenylene) terephthalate unit and a unit derived from an N-substituted hydrocarbylenediamine (e.g., one derived from an N,N-dialkylalkylene).
摘要:
Liquid crystalline polyesters of the aromatic triad type are formed by reaction of an alkylene bis(acetoxybenzoate) monomer and an aromatic dicarboxylic acid monomer with removal of acetic acid by-product therefrom.
摘要:
Rigid isocyanurate urethane polymers useful for insulation purposes and characterized by superior thermal stability are prepared by reacting an excess of polymeric isocyanate with butenediol in the presence of blowing agent and catalyst.