Abstract: Polyimides which contain aliphatic groups can be radiation-crosslinked with chromophoric aromatic polyazides. Solutions in organic solvents can be used as radiation-sensitive coating agents for preparing insulating or protective coatings and as photoresists having high thermal, mechanical and chemical stability.

Abstract: An advanced addition product containing 1,2-epoxide groups is prepared from the reaction of a hydantoin compound of the formula ##STR1## wherein R.sub.1 is hydrogen, alkyl containing 1 to 8 carbon atoms or cycloalkyl containing 5 to 6 carbon atoms; and R.sub.2 is alkyl containing 5 to 8 carbon atoms or cycloalkyl containing 5 to 6 carbon atoms; with less than 1.0 equivalents of NH groups per epoxide group the hydantoin compound, of a binuclear bis-hydantoin of the formula ##STR2## wherein R.sub.3 and R.sub.4 are selected from the group consisting of hydrogen or alkyl of 1 to 4 carbon atoms; or together R.sub.3 and R.sub.4 form tetramethylene or pentamethylene; and A is selected from the group consisting of alkylene, alkylidine or alkylidene substituted by one or more halogen atoms.

Abstract: An advanced addition product containing 1,2-epoxide groups is prepared from the reaction of a hydantoin diglycidyl compound of the formula ##STR1## wherein R.sub.1 is hydrogen, alkyl containing 1 to 8 carbon atoms or cycloalkyl containing 5 to 6 carbon atoms; and R.sub.2 is alkyl containing 5 to 8 carbon atoms or cycloalkyl containing 5 to 6 carbon atoms, with less than 1 equivalent of NH groups per epoxide group of the diglycidyl compound of a binuclear bishydrantoin compound of the formula ##STR2## wherein R.sub.3 and R.sub.4 are selected from the group consisting of hydrogen or alkyl of 1 to 4 carbon atoms; or together R.sub.1 and R.sub.2 form tetramethylene or pentamethylene, and A is a member selected from the group consisting of alkylene, alkylidene or alkylidene substituted by one or more halogen atoms.Such adducts exhibit superior melt-flow characteristics and, when formulated into a thermosettable coating composition, exhibit excellent weathering and over-cure properties.

Abstract: An improved process for preparing saturated dimers of .alpha.-substituted styrene compounds comprises using a catalyst consisting essentially of concentrated sulfuric acid.

Abstract: Polyamide-imides with phenylindane diamines incorporated into the polymer backbone have been found to be soluble in high concentration in polar organic solvents.