Bayer Aktiengesellschaft

Agfa-gevaert Ag

Erwin Muller

Johannes Blahak

Roland Gipp

Heinz Thomas

Kuno Wagner

Peter Haas

Jan Mazanek

Helmut Kleimann

Karl Hartwig Richert

Walter Meckel

Erich Wolff

Wilhelm Saleck

Wolfgang Oberkirch

Wolfgang Ebner

Uwe Dobereiner

Normann Joop

A homo- or copolymer containing copolymerized monomeric units of the formula ##STR1## is a valuable peptizing agent for the precipitation of silver halide. Sensitivity, onset of development and silver covering power are advantageously influenced.

Process of preparing photographic silver halide emulsion

This invention relates to new high molecular weight polyurethanes which contain a very small amount of urethane and urea groups. These new synthetic resins are built up as block copolymers and contain relatively high molecular weight segments which are derived from high melting and low melting polyols and linked together through ester and/or urethane and/or urea groups.

Segmented polyurethane resins

Process for the preparation of new segmented polyurethane resins derived

Novel polyurethane elastomers having excellent physical properties are prepared utilizing as chain extenders aromatic diamine compounds having the general formula ##STR1## wherein R is hydrogen, C.sub.1 to C.sub.4 alkyl, halogen, C.tbd.N, CF.sub.3 or SO.sub.2 --Z wherein Z is C.sub.1 to C.sub.4 alkyl, several of which diamine compounds are hitherto unknown in the art.

Polyurethane elastomers and a process for their production

Cellular and non-cellular polyurethane plastics and semi-hard polyurethane foams which are prepared by the use of novel Mannich bases of the general formula ##STR1## and which have improved strength and tear resistance are disclosed herein.

Polyurethanes prepared with novel Mannich bases

New chemical compounds containing the radicals --CO--NH--CH.sub.2 --OR; ##STR1## wherein R is an alkyl radical having one to six carbon atoms and R.sub.1 is an alkylene radical having one to six carbon atoms and a process for making polyurethanes with the new compounds as a catalyst are provided.

Nitrogen containing chemical compounds and a process for making

Aromatic di- and triamines are disclosed which amines are prepared by reacting isatoic acid anhydride with a compound containing at least two hydroxyl groups and at least one tertiary nitrogen group and having a molecular weight of from about 119 to about 1000. These amines are especially suited for preparing polyurethane resins by reaction with polyisocyanates.

Polyurethanes based on aromatic polyamines

Novel aromatic diamines having the general formula ##STR1## WHEREIN N IS AN INTEGER OF FROM 2 TO 8, X is sulfur or oxygen, and R is an n-valent hydrocarbon radical which may be interrupted by O or S atoms and which is obtained by removing OH or SH groups from a polyol or polythiol having a molecular weight of less than 600, are prepared by reacting a compound having the formula (HX).sub.n R where X, n and R are as defined above with about n-equivalents of an isatoic acid anhydride in the presence of a strong base. The aromatic diamines of the invention are particularly useful as the active hydrogen containing component for reaction with polyisocyanates in the preparation of synthetic resins by the isocyanate-polyaddition process.

Aromatic diamines

Polyurethane resins are provided, which polyurethanes are chain extended with ester diamines of the formula ##SPC1## Wherein R is C.sub.1 to C.sub.20 alkyl radical and R' is a C.sub.1 to C.sub.10 alkyl radical.

Polyurethanes wherein the chain-lengthening agents are benzoic ester

New chemical compounds containing at least one aliphatically bound tertiary nitrogen atom and at least one --CO--NH--CH.sub.2 --OR radical wherein R is an alkyl group of one to six carbon atoms and a process for making polyurethanes with the new compounds as a catalyst are provided.

Chemical compounds and a process for making polyurethanes with the new

Aromatic amines formed by the reaction of isatoic acid anhydride with

A segmented thermoplastic elastomeric copolyester comprising alternating hard segments of polyalkylene terephthalate and soft segments of a polyester containing ether groups, the said soft segments resulting from a polyester having a molecular weight greater than 6000 and a process for the production of said copolyesters.

Thermoplastically processable elastomeric copolyester

High molecular weight polyesters are prepared by reacting cyclic acetals or ketals with carboxylic acids or low molecular weight carboxyl terminated polyesters while avoiding the necessity of removing by-products of condensation such as water or alcohols. The polyesters of the invention are useful in the polyisocyanate polyaddition process or as plasticizers for polyvinylchloride and other synthetic resins.

Growing community of inventors

Leverkusen, Germany

Erwin Muller