Sika Technology Ag

Sven Reimann

Michael Schlumpf

Nicole Kube

Berzad Durmic

Marcel Oertli

Klaas Mennecke

Marc Balmer

Melanie Jenni

A polyester urethane polymer containing isocyanate groups and being liquid at ambient temperature, obtained by reacting at least one monomeric diisocyanate and dimer fatty acid-based polyester diol having OH-number ranging between 28 and 120 mg KOH/g in NCO/OH ratio of at least 3/1, and by subsequently removing large part of monomeric diisocyanate by means of suitable separation process, wherein polymer has NCO content ranging between 1.5 and 6% by wt. and maximum monomeric diisocyanate content of 0.5% by wt. The polymer permits the production of moisture-curing polyurethane compositions for application in ambient temperatures, having improved properties in terms of open time, adhesion, application and weather resistance, with unchanged good properties of storage stability, curing rate, strength, ductility, elasticity and hazardous material classification. Compositions of this type are particularly suitable for use as elastic adhesives in replacement glass for vehicles.

Dimer fatty acid-polyester diol-based polymer, containing isocyanate groups

A blocked amine as curing aid for polymers containing isocyanate groups and having a low monomeric diisocyanate content, obtained from the reaction of at least one monomeric diisocyanate with at least one polyol in an NCO/OH ratio of at least 3/1, followed by removal of a majority of the monomeric diisocyanates by means of a suitable separation method, and to the moisture-curing polyurethane compositions obtained from this use. The use enables storage-stable, moisture-curing polyurethane compositions which can be safely handled even without special safety precautions and can be sold without hazard labeling in many countries, have good processibility and cure reliably and rapidly at ambient temperatures to give a material of high strength, elasticity and extensibility, and high stability to weathering influences. Such moisture-curing polyurethane compositions are particularly suitable as elastic sealants, adhesives or coatings, especially also for exposed outdoor applications.

Polyurethane composition having a low content of monomeric diisocyantes

A pretreatment composition for adhesive bonds, including i) between 10 and 30 parts by weight of at least one polyurethane polymer PU containing isocyanate groups, obtained from the reaction of at least one poly(meth)acrylate polyol P and at least one polyisocyanate I1, with the proviso that the poly(meth)acrylate polyol P has an OH number of at least 35 and the polyurethane polymer PU has an NCO content of between 2.0% and 25.0% by weight, based on the polyurethane polymer PU; ii) 0.1 to 10 parts by weight of at least one organosilane OS; iii) 0 to 10 parts by weight of at least one further polyisocyanate I2; iv) 60 to 90 parts by weight of a solvent L; v) 0 to 15 parts by weight of an industrial carbon black; vi) 0 to 10 parts by weight of a fumed hydrophobic silica.

Solvent-based pretreatment agent having improved adhesion to residual adhesive beads

A polyetherurethane polymer containing isocyanate groups and having an NCO content in the range from 1.3% to 1.9% by weight and a monomeric diisocyanate content of not more than 0.5% by weight, obtained from the reaction of at least one monomeric aromatic diisocyanate and a polyether triol having an average OH functionality in the range from 2.2 to 2.6 and an OH number in the range from 25 to 32 mg KOH/g in an NCO/OH ratio of at least 3/1 and subsequent removal of a majority of the monomeric diisocyanates by means of a suitable separation method, and to moisture-curing polyurethane compositions having a monomeric diisocyanate content of less than 0.1% by weight, comprising said polymer.

Isocyanate-group-containing polymer having a low content of monomeric diisocyanates

A moisture-curing composition that is liquid at ambient temperature and optionally highly viscous, containing: at least one polyether urethane polymer (P1) containing isocyanate groups and having a content of at least 80% by wt. 1,2-propyleneoxy units in the polyether segment, and at least one hydrophobic polymer (P2) containing isocyanate groups and being liquid at ambient temperature, obtained by reacting at least one monomeric diisocyanate and a hydrophobic diol having an OH-number ranging between 28 and 120 mg KOH/g, the polymers P1 and P2 being produced separately and said polymers P1 and P2 having a weight ratio ranging between 70/30 and 98/2.

Moisture-curing composition with good adhesive properties

A moisture-curable composition having flame retardant properties and to the use thereof as an adhesive, sealant or coating. The composition according to the invention contains at least one moisture-reactive polymer in a proportion of 10% to 50% by weight, at least one precipitated, surface-coated aluminum trihydrate in a proportion of 30% to 60% by weight and in preferred embodiments up to 25% by weight of at least one phosphorus-containing compound and up to 20% by weight of at least one carbon additive. The inventive moisture-curable composition has excellent flame retardant properties and after curing remains resistant for a long time at high heat levels.

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Zürich, Switzerland

Sven Reimann