Abstract: A hand held electronic book machine has a platform with a keyboard and a display for displaying text. The book machine further includes a database mounted to the platform. The database has a first memory portion storing text of a prose work and a second memory portion storing predetermined information relevant to the prose work. The database may be permanently mounted to the platform or, more preferably, removably mounted to the platform for enabling the use of the platform with different databases storing text and ancillary information for different prose works. The book machine also comprises an electronic scrolling mechanism operatively connected to the first memory portion of the database and to the display for scrolling the text on the display. Operator actuated selection componentry is operatively connected to the second memory portion of the database and to the display for permitting operator selection of portions of the predetermined information to be displayed on the display.

Abstract: Novel polyurethanes having superior high temperature performance are prepared by reacting 3,5-di(methylthio)2,6-diaminotoluene with a toluenediisocyanate prepolymer having a free --NCO content of 0.1-20% by weight, preferably a toluenediisocyanate/polyether glycol prepolymer having a free --NCO content of 2-7% by weight. The elastomers have good dynamic properties, such as resilience, that make them attractive as tire-forming materials.

Abstract: Blends of 90-99 mol % of a polyhydroxyalkane containing 2-6 carbons and 2-3 hydroxyl groups and 1-10 mol % of an aromatic diamine having a pKb value greater than 11.3 are useful as chain extenders for polyurethanes derived from diphenylmethanediisocyanate (MDI) prepolymers. Their use overcomes the sensitivity to stoichiometry common to MDI prepolymer/polyhydroxyalkane systems and leads to the formation of cast elastomers having better green strength and a shorter demold time. The preferred blends are blends of 1,4-butanediol and di(alkylthio)toluenediamines.