To provide a polyurethane prepolymer whereby a pressure-sensitive adhesive having excellent moisture permeability and also having both low adhesion to skin and high adhesion to a substrate can be obtained, a pressure-sensitive adhesive, an adhesive skin patch, a pressure-sensitive adhesive tape, a wearable device and a wearable device kit.

A hydroxy group-terminated polyurethane prepolymer which is obtained by reacting an oxyalkylene polymer A having an average number of hydroxy groups per molecule of from 2.1 to 3, an oxyalkylene polymer B having one hydroxy group per molecule, and a diisocyanate compound, wherein the number average molecular weight of the oxyalkylene polymer B is at least 5,000, and the content of ethylene oxide units in the hydroxy group-terminated polyurethane prepolymer is more than 10 mass %, a pressure-sensitive adhesive, an adhesive skin patch, a pressure-sensitive adhesive tape, a wearable device and a wearable device kit.

The invention relates to a method for producing soft polyurethane foam obtained by reacting a composition containing a component A1 containing at least one filled polyol, a component A2 containing compounds reactive with isocyanates and having a hydroxyl value of ≥20 to <100 mg KOH/g, the component A2 not containing any filled polyol, a component A3 containing water and/or at least one physical blowing agent, a component A4 containing auxiliary agents and additives, and a component B containing di- and/or polyisocyanates, characterized in that the reaction occurs in the presence of 0.5 to 3 parts by weight of an organic urea derivative as component C, which is obtained by reacting urea with a difunctional amine having a number-average molecular weight of 200 to 1000 g/mol. The invention also relates to a soft polyurethane foam obtainable by the method.

Flexible polyurethane foams are characterized in having slow recovery times, low foam densities and very low compression sets. The foams are useful in human comfort applications such as pillows and mattresses.

A bio-polyol composition, a foam composition, and a foam material are provided. The bio-polyol composition includes 25-70 parts by weight of lignin; 30-75 parts by weight of non-amine-based polyol; and, 2-17 parts by weight of amine-based polyether polyol. In particular, the sum of the weight of the lignin and the non-amine-based polyol is 100 parts by weight.

The invention relates to polymer comprising structural units according to formula (I), R.sup.1—X—(C═O)—NH—R.sup.2—NH—(C═O)—O—POA-R.sup.3—(O—POA-R.sup.4).sub.n wherein R.sup.1 represents an organic group terminated by a hydrocarbyl group having 6 to 50 carbon atoms, X represents O or N—R.sup.5, wherein R.sup.5 represents a hydrogen atom or a hydrocarbyl group having 1 to 30 carbon atoms, R.sup.2 represents a hydrocarbyl group comprising an aromatic group and having 6 to 40 carbon atoms, POA represents a polyoxyalkylene group, R.sup.3 represents an organic group having 2 to 40 carbon atoms, n is an integer from 1 to 6, R.sup.4 is independently selected from —(C═O)—NH—R.sup.2—NH—(C═O)—NH—R.sup.1, —R.sup.6, wherein R.sup.6 represents a hydrogen atom or an aliphatic or aromatic group having 1 to 24 carbon atoms, and wherein the polymer has an average of at least 1.8 end groups R.sup.1 per molecule, a number average molecular weight in the range of 2000 to 100000 Daltons, and a polydispersity in the range of 1.0 to 5.0, wherein the quotient of the polydispersity divided by (n+1) is less than 1.0.

The present invention aims to provide a polyol composition capable of producing a flexible polyurethane foam having excellent low resilience at room temperature and good breathability. The present invention provides a polyol composition (C) for producing flexible polyurethane foam, containing a polyester polyol (A) and a polyether polyol (B), wherein the followings (1) to (4) are satisfied: (1) the polyol composition (C) has an ester group concentration of 0.4 to 4.0 mmol/g based on the weight of the polyol composition (C); (2) the polyol composition (C) has an oxyethylene group unit content of 15 to 40 wt % based on the weight of the polyol composition (C); (3) the polyester polyol (A) includes a polyester polyol (A1) having two to four hydroxy groups in one molecule obtained by polymerization of a raw material containing a compound (a) having multiple hydroxyl groups and a polycarboxylic acid or acid anhydride of the polycarboxylic acid; and (4) the polyether polyol (B) includes an oxyethylene group-containing polyether polyol (B1).

A process for preparing polyether-siloxane block copolymers by hydrosilylation of alpha,omega-modified hydrosiloxanes with alpha,omega-modified di(meth)allyl polyethers in the presence of a hydrosilylation catalyst, wherein the reaction is performed in a solvent mixture comprising aromatic solvents, polyethers and alkoxylated alcohol, is described.

Suggested is a method for modifying the rheology of a casting resin and/or coating composition, comprising the following steps: providing a composition comprising at least one monomer capable of forming a casting resin or coating upon polymerisation; and adding to said composition a working amount of a urea urethane obtained under specific conditions as a thixotropic agent.

Polyurethanes are made by reacting, in one or more reaction steps, a) at least one organic polyisocyanate, b-1) one or more polyols having a hydroxyl equivalent weight of greater than 250 g/mol and a nominal hydroxyl functionality of 2 to 4 and b-2) at least one alkoxylated Mannich base to produce a polyurethane polymer having a density of at least 750 kg/m3 and a hard segment content of 20 to 80% by weight.

The invention relates in a first aspect to a process for producing a polyurethane foam, comprising the reaction of (a) an isocyanate composition comprising at least one polyisocyanate based on diphenylmethane diisocyanate; (b) a polyol mixture, wherein the polyol mixture comprises (b1) 50% to 85% by weight of at least one polyether polyol having a hydroxyl value in the range from 10 to 60 mg KOH/g, an OH functionality of more than 2, and an ethylene oxide proportion in the range from 50% to 100% by weight based on the alkylene oxide content of the at least one polyether polyol, and (b2) 15% to 50% by weight of at least one polyether polyol having a hydroxyl value in the range from 10 to 100 mg KOH/g, an OH functionality of more than 2, an ethylene oxide proportion in the range from 2% to 30% by weight based on the alkylene oxide content of the at least one polyether polyol, and a proportion of primary OH groups of 40 to 100% based on the total number of OH groups in the at least one polyether polyol, in each case based on the total amount by weight of constituents (b1) and (b2), which adds up to 100% by weight, and (b3) 0 to 20 further parts by weight of an optionally derivatized filler, based on 100 parts by weight of components (b1) and (b2), optionally present as a constituent of a graft polyol based on one or more of components (b1) and (b2); (c) a blowing agent composition comprising water; wherein the reaction employs the blowing agent composition (c) in a weight-based ratio of the weight of blowing agent composition (c) to the total weight of all isocyanate-reactive compounds used in the reaction in the range from 1:14 to 1:6; wherein a polyurethane foam having a foam density, determined according to DIN EN ISO 845 (October 2009), of not more than 25 kg/m.sup.3 and a compression hardness, determined at 40% compression in the first compression in accordance with DIN EN ISO 3386-1 (October 2015), in the range from 10 to 80 kPa is obtained.

In a second aspect, the invention relates to a polyurethane foam obtained or obtainable by the process of the first aspect.

A third aspect of the invention relates to the use of a polyurethane foam according to the second aspect as a sound absorption material.

According to a fourth aspect, the invention relates to a sound absorption material comprising a polyurethane foam according to the second aspect, preferably consisting of a polyurethane foam according to the second aspect.

A fifth aspect of the invention relates to the use of a polyol mixture (b) comprising (b1), (b2), and (b3) as defined in the first aspect, for producing a polyurethane foam.