Abstract: Polyimide polymers of improved physical properties and thermal stability may be prepared by reacting an N,N'-bismaleimide with an activated methylene compound in a nonreactive organic solvent system. The polymers are useful in producing films, moldings, and laminates or other composites.

Abstract: This invention relates to photopolymerizable compositions comprising an ethylenically unsaturated organic compound and a visible light photosensitizing composition comprising a combination of Mn.sub.2 (CO).sub.10 and a co-catalyst selected from the group consisting of a compound characterized by the formula ##STR1## WHEREIN R.sub.1 is --H, --Br, or --CH.sub.3, R.sub.2 is --H or --CH.sub.3, and R.sub.3 is --H or --CH.sub.3 ; cumene; diisopropyl benzene; alkyl mercaptans containing from 10 to 16 carbon atoms; thiourea; and mixtures thereof and to polymerized products thereof. The invention also provides a process for photopolymerizing ethylenically unsaturated organic compounds with visible light in the range of 4,000 to 7,000 angstroms.

Abstract: This invention relates to photopolymerizable compositions comprising an ethylenically unsaturated organic compound and a visible light photosensitizing composition comprising a combination of Mn.sub.2 (C0).sub.10 and a co-catalyst selected from the group consisting of a compound characterized by the formula ##SPC1##Wherein R.sub.1 is --H, --Br, or --CH.sub.3, R.sub.2 is --H or --CH.sub.3, and R.sub.3 is --H or --CH.sub.3 ; cumene; diisopropyl benzene; alkyl mercaptans containing from 10 to 16 carbon atoms; thiourea; and mixtures thereof and to polymerized products thereof. The invention also provides a process for photopolymerizing ethylenically unsaturated organic compounds with visible light in the range of 4,000 to 7,000 angstroms.