Abstract: Polyamide compositions comprising:(a) poly(.epsilon.-caprolactam) resin of viscosity average molecular weight of at least about 15,000; and(b) at least one block polymer having(i) from about 25 to about 80 weight percent poly(.epsilon.-caprolactam) segments of the formula ##STR1## wherein x is an integer equal to 5 or more; and (ii) from about 75 to about 20 weight percent of segments having a number average molecular weight of at least 300 selected from the group consisting of segments of poly(propylene oxide), polycaprolactone, polytetrahydrofuran, polybutadiene, polyisoprene, polyisobutylene, poly(C.sub.1 -C.sub.8 alkylene acrylate), poly(C.sub.1 -C.sub.

Abstract: A method of preparing a lactam magnesium halide comprising the steps of:a. reactively admixing magnesium, hydrocarbon halide and lactam in the presence of cyclic ether solvent, wherein the halide is either chloride or bromide; andb. removing the cyclic ether and the hydrocarbon residue.

Abstract: An acrylamide polymer comprising acrylamide and a sufficient amount of cinnamic acid to substantially reduce the viscosity of the acrylamide polymer and solution.

Abstract: This invention relates to construction panels comprising metal-thermoplastic-metal laminates and a process for preparing same, said laminates possessing in combination critical service properties of low coefficient of linear thermal expansion, low inelastic ratio, and excellent flexural stiffness.

Abstract: This invention relates to construction panels comprising metal-thermoplastic-metal laminates and a process for preparing same, said laminates possessing in combination critical service properties of high heat distortion temperature, low coefficient of linear thermal expansion, low inelastic ratio, and lightness in weight.