Process for producing PU foams by reacting at least one polyol component with at least one isocyanate component in the presence of one or more catalysts that catalyse the isocyanate-polyol and/or isocyanate-water reactions and/or isocyanate trimerization, and optionally one or more chemical or physical blowing agents, with use of SiOC-bonded polyether siloxanes having branching in the siloxane moiety, prepared from branched siloxanes bearing acetoxy groups, wherein a sufficient amount of the SiOC-bonded polyether siloxane having branching in the siloxane moiety is added that the proportion by mass of this polyether siloxane (e) based on the finished PU foam is from 0.0001% to 10% by weight.

The invention relates to a branched copolymer containing rigid blocks and flexible blocks, wherein the branchings are made by a polyol residue binding rigid blocks of the copolymer, said polyol being a polyol comprising at least three hydroxyl groups, said copolymer having a weight-average molar mass Mw of greater than or equal to 80 000 g/mol, and wherein the ratio of the weight-average molar mass Mw of the copolymer to the number-average molar mass Mn of the copolymer is greater than or equal to 2.2.

The invention also relates to a process for manufacturing such a copolymer and also to a foam of such a copolymer, to a process for manufacturing such a foam and articles made from such a foam.

Environmentally friendly, sustainable, and high-performance ultralight composite foams are disclosed. The composite foams are prepared from cellulose nanomaterial, polymeric material, and a crosslinking agent. The fabrication process is simple and uses only water. The composite foams exhibit an elastic strain exceeding the values reported for known nanocellulose-based foams with no reinforcement. The foams exhibit a thermal conductivity superior to that of traditional insulating materials and retain structural integrity after burning.

A composition for preparing a foamed polyurethane article is disclosed. The composition comprises (1) an isocyanate-reactive component and (2) an isocyanate component. The (1) isocyanate-reactive component comprises (A) an organopolysiloxane having an average of at least two carbinol functional groups per molecule and (B) a polyol. The (A) organopolysiloxane is present in an amount of from > 10 to < 99 wt.% based on the combined weight of the (A) organopolysiloxane and the (B) polyol. The (2) isocyanate component comprises (C) a polyisocyanate. The composition further comprises (D) a blowing agent, and (E) a catalyst. A foamed polyurethane article comprising the reaction product of the composition is also disclosed, along with use of the foamed polyurethane article.

Granulate based on high-temperature thermoplastics with a bulk density in the range of 100 to 650 kg/m.sup.3 in accordance with DIN ISO 697:1984 and less than 1% by weight content of volatile organic compounds, and also method for their production and use for the production of membranes or coatings, or for the toughness-modification of reactive resins.

This invention relates to an in-situ formed polyether polyol blend having an overall functionality of 2 to 3 and an overall hydroxyl number of 40 to 220 mg KOH/g. A process for preparing these in-situ formed polyether polyol blends is also disclosed. These in-situ formed polyether polyol blends are suitable for a process of preparing viscoelastic flexible polyurethane foams.

Recovery times and/or airflow of flexible polyurethane foam is increased by including certain tackifiers in the foam formulation. The tackifiers are characterized in being incompatible with polyol or polyol mixture used to make the foam, having a viscosity of at least 5,000 centipoise at 25 #C and having a glass transition temperature of at most 20 #C. The tackifier is pre-blended with certain monols to form a lower-viscosity blend that is combined with one or more other polyols and a polyisocyanate to form a reaction mixture for producing a polyurethane foam.

Disclosed herein are matrices, compositions and methods of making matrices. The matrix comprises a biomolecule and the matrix is a dried, cross-linked foam. The matrix is not lyophilized. The method comprises foaming the composition, crosslinking the composition and drying the composition. Matrices disclosed herein are useful as wound dressings and treating wounds.

Polymer foams based on polyetherimides (PEI) meet the legal requirements of the aerospace industry for both the interior and exterior of aircraft.

There is provided a method for manufacturing a patterned cellulose-based film. The cellulose-based film is modified with a pattern provided by a mold is caused to absorb water. The absorbed water causes a volume increase of the cellulose-based film, which causes modifying the cellulose-based film by the cellulose-based film pressing against the mold. Since, the cellulose-based film is pressed against the mold due to swelling caused by water molecules absorbed into the cellulose-based film, the pattern of the mold may be replicated to the cellulose-based film without necessarily requiring any external pressure.