Sika Technology Ag

Nicole Kube

Michael Schlumpf

Sven Reimann

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 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 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.

Growing community of inventors

Unterengstringen, Switzerland

Nicole Kube