Basf Aktiengesellschaft

Joachim Streu

Bernd Bruchmann

Roland Minges

Helmut Tesch

Manfred Genz

Friedhelm Lehrich

Siegmund Pohl

Johann Swoboda

Wolfgang Straehle

Guenter Scholz

Matthias Marx

Dietrich Scherzer

Herbert Mueller

Peter Weyland

Frank Werner

Gerhard Ramlow

Joachim Jaehme

4,4'-disubstituted bis(2,6-diisopropylphenyl)carbodiimides of the formula (I) ##STR1## where R is 1-methyl-1-phenylethyl, phenoxy or tert-butyl, a process for their preparation, their use as stabilizers against hydrolytic degradation of polyaddition and polycondensation products containing ester groups, and the novel 4-(1-methyl-1-phenylethyl)-2,6-diisopropyl-, 4-phenoxy-2,6-diisopropyl- and 4-tert-butyl-2,6-diisopropylphenyl isocyanates which can be used for their preparation.

4-substituted bis(2,6-diisopropylphenyl)-carbodiimides, their

4,4'-disubstituted bis-(2,6-diisopropylphenyl)carbodiimides of the formula (I) ##STR1## where R is 1-methyl-1-phenylethyl, phenoxy or tert-butyl, a process for their preparation, their use as stabilizers against hydrolytic degradation of polyaddition and polycondensation products containing ester groups, and the novel 4-(1-methyl-1-phenylethyl)-2,6-diisopropyl-, 4-phenoxy-2,6-diisopropyl- and 4-tert-butyl-2,6-diisopropylphenyl isocyanates which can be used for their preparation.

4-substituted bis (2,6-diisopropylphenyl)- carbodiimides, their

Novel carbodiimides and/or oligomeric polycarbodiimides containing terminal isocyanate, urethane and/or urea groups are obtainable, for example, by condensation of 1,3-bis(1-methyl-1-isocyanatoethyl)benzene with elimination of carbon dioxide followed, if desired, by reaction of all or some of the free isocyanate groups of the resultant (poly)carbodiimides with aliphatic, cycloaliphatic or araliphatic amines, alcohols and/or alkoxypolyoxyalkylene alcohols, and are used as stabilizers against hydrolytic degradation of polyaddition and polycondensation products containing ester groups.

Carbodiimides and/or oligomeric polycarbodiimides based on 1 3-bis

4,4'-disubstituted bis-2,6-diisopropylphenyl)carbodiimides of the formula (I) ##STR1## where R is 1-methyl-1-phenylethyl, phenoxy or tert-butyl, a process for their preparation, their use as stabilizers against hydrolytic degradation of polyaddition and polycondensation products containing ester groups, and the novel 4-(1-methyl-1-phenylethyl)-2,6-diisopropyl-, 4-phenoxy-2,6-diisopropyl- and 4-tert-butyl-2,6-diisopropylphenyl isocyanates which can be used for their preparation.

There is now provided a carbodiimide or polycarbodiimide of the formula: ##STR1## where the R radicals are identical or different and are selected from the group consisting of --NHCONHR.sup.1 --, --NHCONR.sup.1 R.sup.2 --, and --NHCOOR.sup.3 --, where R.sup.1 and R.sup.2 may be identical or different and are alkyl, cycloalkyl, or aralkyl, and R.sup.3 is identical to R.sup.1 or is alkoxypolyoxyalkylene, and n is an integer from 0 to 10. There is also provided an ester containing plastic which contains this carbodiimide as an anti-hydrolysis agent. The plastics may be a polyurethane cellular or non-cellular elastomer or thermoplastic.

Carbodiimides and/or oligomeric polycarbodiimides based on

The present invention relates to novel carbodiimides or oligomeric polycarbodiimides containing terminal isocyanate, urea and/or urethane groups, methods for their preparation, and their use as hydrolysis stabilizers.

Carbodiimides and/or oligomeric polycarbodiimides based on 1,3-bis

Disclosed is a process for the preparation of primarily closed cell rigid foams, useful for strengthening mechanical construction parts or for use as insulation material, containing urethane groups, or urethane and isocyanurate groups where the polyol component is a higher molecular weight polyester polyol, containing in bonded form units having one or more of the structures: ##STR1## or a mixture of said polyester polyol and known polyester polyols and/or polyether polyols.

Process for the preparation of primarily closed cell rigid foams

A process for the preparation of polyester polyols having an acid number of less than 1, a hydroxyl number of approximately 20 to about 400, and having a functionality of efficaciously 2 to 3, wherein polycarboxylic acids and/or their anhydrides and multivalent alcohols are polycondensed, preferably in the absence of common esterification catalysts, at temperatures of from about 150.degree. to 250.degree. C., optionally under reduced pressure, up to an acid number of from 20 to 5. The resulting polycondensate is then oxyalkylated per carboxyl group using from 1 to 5 moles of an alkylene oxide, for example 1,2-propylene oxide and/or preferably ethylene oxide, in the presence of at least one tertiary amine catalyst from the group consisting of N-methylimidazole, diazabicyclo[2,2,2]octane, diazabicyclo[5,4,0]undec-7-ene and pentamethyldiethylenetriamine and mixtures thereof, in a quantity of from about 0.001 to 1.0 weight percent based on the weight of the polycondensate, at temperatures from about 100.degree. to 170.degree. C. and under a pressure of about 1 to 10 bar.

Process for the preparation of polyester polyols

This invention relates to a process for the preparation of non-cellular or cellular polyurethane elastomers by the reaction of

Process for the preparation of non-cellular or cellular polyurethane

The invention relates to a process for the preparation of elastic, noncellular or cellular polyurethane molded articles or polyurethane-polyurea molded articles through reactions of

Process for the preparation of elastic, noncellular or cellular

Disclosed are polyester polyols liquid at 25.degree. C., having an average functionality of from 2 to 3, a hydroxyl number of from 25 to 400, an acid number smaller than 10 and a viscosity at 25.degree. C. of from 200 to 10,000 mPas, which contain in bonded form units having at least one of the structures

Polyester polyols liquid at room temperature and their preparation and

This invention relates to polyester polyols which are liquid at 25.degree. C. and contain units having the structure --OCH.sub.2 --CH(CH.sub.3)--CH.sub.2 CH.sub.2 O-- which are bound together and have an average functionality of from about 2 to 3, a hydroxyl number of from about 25 to 300, an acid number of less than about 2, and a viscosity of from about 200 to 10.sup.5 mPas at 25.degree. C. The polyols are prepared through polycondensation in the molten state, in the presence of or absence of esterification catalysts, of an aliphatic di- and/or polycarboxylic acid and/or di- and/or polycarboxylic acid ahydride and 2-methyl-1,4-butanediol or mixtures comprised of 2-methyl-1,4-butanediol and at least one linear or branched, aliphatic di- through tetravalent alcohol, which optionally contains ether bridges and has a 2-methyl-1,4-butanediol content of at least 20 weight percent based on the weight of the alcohol mixture. The polyester polyols are suited for the preparation of non-cellular or cellular polyurethane plastics or polyurethane-polyurea plastics and preferably polyurethane elastomers, using the polyisocyanates addition polymerization process.

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Dachau, Germany

Joachim Streu