Akzo N.v.

Carel T Wreesmann

Erwin W Erdhuisen

Auke Gerardus Talma

Doetze J Sikkema

Willem C Endstra

Erwin W Erdeuisen

A peroxide-vulcanized rubber composition which comprises the vulcanization reaction product of a rubber, an organic peroxide, a biscitraconimido compound and a radical scavenger, is disclosed. The peroxide-vulcanized rubber compositions of the disclosure have significantly improved physical properties. Also disclosed are a peroxide-vulcanization process carried out in the presence of a biscitraconimido compound and a radical scavenger to control the scorch time and the use of a biscitraconimido compound and a radical scavenger to control scorch time in the peroxide-vulcanization of rubber.

Peroxide vulcanized rubber composition

A linear addition polymer having sidegroups which may be coupled to it or not through a spacer and have a molecular hyperpolarizability .beta. of at least 10.sup.-38 m.sup.4 /V, characterized in that the recurring units of the polymer correspond to the formula ##STR1## wherein X represents a hydrogen atom or a lower alkyl group and m=1 or optionally 0, where

Linear addition polymer with hyperpolarizable side groups

Polyurethanes having high hyperpolarizability densities and other favorable properties can be easily prepared from nonlinear optical active diols (NLO-diols) of a certain general formula, which have a delocalized .pi. electron system to which both an electron donor group and an electron acceptor group are coupled directly (D.pi.A system). The polyurethanes may be used in optical waveguides.

Non-linear optical active diols and polyurethanes prepared therefrom

Liquid crystalline side-chain polyesters prepared by polycondensing a dicarboxylic acid or a derivative thereof with a diol of a certain general formula. Of such diols the essence is that they have a delocalized .pi. electron system to which both an electron donor group and an electron acceptor group are coupled directly (D.pi.A-system). Because of the structure of the diol to which the D.pi.A-system is linked the polyesters exhibit excellent Tg and Tc values. The polyesters are to be used in optical waveguides or for optical data storage.

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Arnhem, Netherlands

Carel T Wreesmann