Bayer Aktiengesellschaft

Alois Fehlbier

Hermann Gruber

Peter Hohlein

Wolfgang Wellner

Hans-Dieter Ruprecht

The present invention relates to a process for the preparation of highly flexible polyurethane plastics which are resistant to chemicals by reacting

Highly flexible polyurethane plastics and coatings which are resistant

The present invention is directed to a process for the preparation of air drying binders containing free isocyanate groups, having thixotropic properties and prepared by reacting aromatic diamines which have at least one alkyl substituent in the ortho position to each amino group with either prepolymers or semi-prepolymers containing free isocyanate groups and based on polyisocyanate mixture of the diphenylmethane series containing at least 20% by weight of 2,4'-diisocyanatodiphenylmethane and organic polyhydroxyl compounds or mixtures of these prepolymers or semi-prepolymers with prepolymers or semi-prepolymers based on other organic polyisocyanates, provided that the mixture contains at least 3% of the prepolymers or semi-prepolymers based on polyisocyanate mixtures of the diphenylmethane series. The invention further relates to the binders produced by this process and their use for the preparation of coating and sealing compounds which harden under the influence of atmospheric moisture.

Process for the preparation of thixotropic binders, the binder

The present invention is directed to polyhydroxyl compounds containing both ether and ester groups, having an average hydroxyl functionality of 2 to 6 and an average hydroxyl number of about 100 to 600, based on the esterification product of (i) polyether polyols having an average hydroxyl functionality of 3 to 8 and an average hydroxyl number of about 200 to 1000 with (ii) about 5 to 70 equivalent %, based on the hydroxyl group of component (i) and the carboxyl group of component (ii), of organic monocarboxylic acids. The present invention is also directed to the use of the polyhydroxyl compounds as synthesis components in the production of polyurethane plastics materials by the isocyanate-polyaddition process, particularly their use as the polyol component in two-component polyurethane coating agents and/or polyurethane casting systems which are solvent-free or have a low solvent content.

Polyhydroxyl compounds containing ether and ester groups and their use

The present invention is directed to a process for applying a chemically resistant coating to a substrate which entails coating a substrate with a composition containing

Process for the production of chemically resistant coatings

The present invention relates to a process for preparing elastic laminates by admixing elastomeric granules with a moisture hardenable polyurethane binder and hardening the binder. The binder is formulated to have a workable viscosity at room temperature and to avoid crystallization at temperatures above about 0.degree. C. The binder is the reaction product of polyisocyanates of the diphenyl methane series having at least 20 wt. % of 2,4'-diisocyanatodiphenyl methane and di- and/or trihydroxy polyethers. The invention also relates to the binder composition itself and a process for preparing it. The binder has a viscosity of about 1000 to 15,000 cP at 20.degree. C and an NCO content of about 5 to 15 wt. %. It is prepared at an NCO to OH ratio of about 2:1 to 15:1 and at about 15.degree. to 100.degree. C.

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Burscheid, Germany

Alois Fehlbier