Chemtura Corporation

Lanxess Solutions US Inc.

Thomas R Doyle

Ronald O Rosenberg

Mukund C Shah

Mark P Ferrandino

Kevin Jackson

Phaniraj T Nagaraj

Yujie Ding

R Scott Archibald

The addition of a small amount of an alkyl sulfoxide, e.g., DMSO, to an isocyanate capped prepolymer provides a storage stable prepolymer composition in which the prepolymer is also highly activated towards curing with certain blocked curing agents such as methylenedianiline metal salt coordination complexes. The prepolymer/alkyl sulfoxide compositions are cured by said blocked curing agents at lower temperatures and/or at an accelerated rate compared to similar compositions lacking the alkyl sulfoxide providing high performance polyurethane elastomers.

Storage stable activated prepolymer composition

Compositions comprising isocyanate capped polyurethane prepolymers and select mono-benzyl phthalate plasticizers, e.g., 7-(2,6,6,8-tetramethyl-4-oxa-3-oxo-nonyl) benzylphthalate, exhibit better isocyanate stability than prepolymer compositions comprising other plasticizers common in polyurethane systems. Curing compositions comprising these prepolymers, the select mono-benzyl phthalate plasticizers, and methylenedianiline coordination complex curing agents exhibit improved processing characteristics and yield elastomeric polyurethanes with lower compression set, higher break strength and lower color than similar composition comprising plasticizers such as benzoate plasticizers.

High performance polyurethane prepolymer and curing compositions

A process for preparing a curing composition of a coordination complex comprising methylenedianiline (MDA) and a salt, and less than 1000 of free MDA. The curing composition may be used in curing polyurethanes and epoxy resins.

Curing compositions having low-free amounts of methylenedianiline

Plasticizer free curing compositions comprising small particle size complexes of methylenedianiline and an alkali salt, e.g. a 3:1 coordination complex of MDA/alkali salt, with average diameter 60 micron or less, often 20 micron or less, e.g., 10 microns or less, dispersed in a volatile, non-polar, organic solvent are prepared. Stable one pack urethane compositions comprising the plasticizer free curing compositions and polyurethane prepolymers are prepared, which exhibit excellent storage stability and overcome many of the drawbacks encountered when using MDA complexes dispersed in plasticizers such as high boiling aromatic and alkyl di-esters.

Plasticizer free curing composition

A method for preparing a polyurethane elastomer, the method comprising mixing an isocyanate terminated prepolymer and a nitrogen-containing organic salt to form a prepolymer mixture and reacting the prepolymer in the prepolymer mixture with a methylenedianiline metal salt coordination complex chain extender to form the polyurethane elastome. The nitrogen-containing organic salt is selected from the group consisting of an ammonium salt, an imidazolium salt, a pyridinium salt, a pyrrolidinium salt, a piperidinium salt, and a morpholinium salt.

Accelerated cure of isocyanate terminated prepolymers

A prepolymer mixture for preparing a polyurethane elastomer, the mixture comprising an isocyanate terminated prepolymer and a nitrogen-containing organic salt. The nitrogen-containing organic salt may be selected from the group consisting of an ammonium salt, an imidazolium salt, a pyridinium salt, a pyrrolidinium salt, a piperidinium salt, and a morpholinium salt.

A curing composition of a coordination complex comprising methylenedianiline (MDA) and a salt, and less than 1000 of free MDA. The curing composition may be used in curing polyurethanes and epoxy resins.

In one aspect, the invention relates to storage-stable and flowable polyurethane compositions comprising (a) one or more isocyanate-terminated polyurethane prepolymers derived from one or more hydrocarbon ring-containing diisocyanates and/or triisocyanates and one or more polyols; (b) one or more metal salt complexes of methylenedianiline; and (c) one or more organic acid halide compounds having one or more acid halide groups, wherein the one or more organic acid halide compounds are in an amount wherein the acid halide groups are present in a minimum concentration of about 100 parts per million by weight of the polyurethane prepolymer. In other aspects, the invention relates to methods for storing the curable polyurethane compositions, as well as methods for producing polyurethane elastomers.

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Wallingford, CT, United States of America

Thomas R Doyle