Abstract: A process is provided for preparing a high-quality methyl methacrylate polymer by polymerizing a monomer comprising methyl methacrylate as a main component in the presence of a radical polymerization initiator, a chain transfer agent, and a small amount of methanol as a solvent. The polymerization is carried out in a uniform solution at a temperature of 90.degree. to 180.degree. C. so that a monomer conversion of 40 to 90 mol % is attained. According to this process, a methyl methacrylate polymer is obtained which reduces the generation of silver streaks, voids, coloring, odor and the like at the time of thermal molding.

Abstract: In the copolymerization of 4-methyl-1-pentene and at least one alpha olefin under batch polymerization conditions at a temperature of at least about 50.degree. C. wherein 4-methyl-1-pentene is initially polymerized in the absence of comonomer and then comonomer is added to the reaction vessel to permit copolymer formation, the improvement comprising initially forming 4-methyl-1-pentene homopolymer in an amount sufficient to reduce the solubility of the later formed copolymer at the polymerization temperature, said homopolymer being no more than about 5 weight percent of the end product copolymer. Also the products of such polymerizations are disclosed.

Abstract: Compounds which contain peroxide linkages as well as a hindered amine light stabilizer moiety of low basicity function as free radical polymerization initiators and provide a polymer containing a hindered amine stabilizer chemically bonded to said polymer. The low basicity of the instant compounds prevents interaction with acid catalysts used in some polymerization systems.

Abstract: The invention relates to a bone cement based on physiologically tolerated polymers, the incorporation of acoustic perturbation elements having a sound resistance differing from that of the polymer making it possible, in the case of a necessary re-operation, to disrupt the bone cement by the application of acoustic waves to such an extent that it can easily be removed from the implant location.

Abstract: A one component room temperature setting composition having an excellent storage stability comprising a hydrolyzable silyl group-containing vinyl polymer, a hardener and a stabilizer selected from a hydrolyzable ester compound and a .beta.-diketone compound, which may further contain a pigment and a solvent. The storage stability of the composition containing the hydrolyzable silyl group-containing vinyl polymer which is crosslinkable in the presence of water to harden at room temperature, can be remarkably improved by the presence of the above stabilizer.

Abstract: A method for compounding a nitrile polymer with a formaldehyde compound in order to reduce the extractable HCN content of the nitrile polymer which process comprises blending a formaldehyde compound and a particulate nitrile polymer at a temperature in the range of from 125.degree.F. to 300.degree.F. (52.degree.C. to 149.degree.C.) and then purging the blend.