Abstract: An optical disc medium and corresponding optical recording method and optical recording apparatus. The optical disc medium comprises a substrate on which a shape according to modulated information data has been formed, and a coating film formed on the substrate. Known data is recorded in a predetermined location of the information data, with the known data being rewritten as postscript information by recording a postscript portion to the coating film to alter a portion of the known data, wherein the postscript information comprises readable non-error data.

Abstract: A process for modification of a polymer comprising modifying a polymer (A) capable of decomposing by carbon radicals present in the molecule thereof using a compound (B) having a nitroxide radical in the molecule thereof and a radical initiator (C) in a ratio of (B)/(C) (molar ratio) of at least 0.7, whereby organic groups derived from the nitroxide radicals are introduced into the polymer and a modified unhalogenated butyl rubber obtained therefrom.

Abstract: To improve the control behavior of an anti-lock control system, in a method wherein the rotational behavior of the wheels is measured and evaluated and a vehicle reference speed, wheel slip data and wheel acceleration data and other control parameters are determined, the lowest wheel speed (v.sub.min) is continuously compared with the highest wheel speed (v.sub.max) during a braking operation. In the event of an approximate correlation between the lowest (v.sub.min) and the highest (v.sub.max) wheel speed and if the correlation lasts longer than a predefined length of time (T1, T2), the pressure in the brakes of the front wheels is permitted to increase or caused to increase after this length of time. The duration of the predetermined length of time (T1, T2) can be varied as a function of the acceleration or deceleration (v.sub.3, v.sub.4) of the non-driven wheels.