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.

A waterborne polyurethane dispersion is provided. The waterborne polyurethane dispersion is prepared by using a tri-functionality polyether polyol as part of the polyols for forming the prepolymer and a hydrophilic amino siloxane co-chain extender, and can exhibit superior performance properties such as enhanced color fastness, improved low temperature stability, good anti-stickiness, bally flex resistance, anti-abrasion and mechanical properties. A laminated synthetic leather article prepared with said waterborne polyurethane dispersion as well the method for preparing the synthetic leather article are also provided.

A waterborne polyurethane dispersion is provided. The waterborne polyurethane dispersion comprises residual moiety of a hydroxy-terminated siloxane compound in the main chain and exhibits good anti-stickiness and/or wet color fastness while retaining superior mechanical properties. A laminated synthetic leather article prepared with said waterborne polyurethane dispersion as well the method for preparing the synthetic leather article are also provided.

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.

Polyol premixes and thermally insulating rigid polyurethane foams, such as those that can be used as a thermal insulation medium in the construction of refrigerated storage devices, are disclosed. A polymer polyol having a OH number of greater than 260 mg KOH/g is utilized. The resulting polyurethane foams can exhibit improved thermal insulation properties without sacrificing other important physical and processing properties.

The present invention refers to a method for the preparation of a polymer polyol which comprises: (i) preparing an intermediate in a first reactor by polymerizing a mixture comprising: (a) a base polyol in an amount from 60 to 100 wt % of the total amount of base polyol, (b) at least one ethylenically unsaturated monomer, (c) an acylperoxide radical initiator in an amount from 50 to 90 wt % of the total amount of acylperoxide radical initiator, and (d) a preformed stabilizer in an amount from 70 to 100 wt % of the total amount of preformed stabilizer or a macromer in an amount of from 70 to 100 wt % of the total amount of macromer; (ii) polymerizing in a second reactor a mixture comprising the intermediate prepared in step (i), the balance acylperoxide radical initiator proportion, the balance preformed stabilizer or macromer proportion and the balance base polyol proportion;
wherein the at least one ethylenically unsaturated monomer is added only to the first reactor.

This invention relates to improved flexible foams prepared from polymer polyols and to a process for preparing these improved flexible foams.

The adhesive system of the invention is especially useful in bonding replacement windows into vehicles. They allow for sufficient working time while still realizing a fast drive away time. The adhesive system is comprised of a moisture curable adhesive and a cure accelerator that may be applied using a simple single caulk gun and may be applied at ambient temperatures such as −10° C. and about 45° C. The cure accelerator is comprised of a polyol having a backbone that has at least one amine in the backbone. The moisture curable adhesive typically is comprised of an isocyanate terminated prepolymer.

A stable dispersant and an application thereof in preparing copolymer polyols, the preparation method for the stable dispersant including the steps of 1) contacting a polyol with a dianhydride compound for reaction so as to prepare an adduct; 2) performing a ring-opening addition reaction on the adduct obtained in step 1) and an epoxy compound to prepare a stable dispersant; the dianhydride compound does not contain a double bond that may copolymerize with an olefinically unsaturated monomer, while the epoxy compound contains a double bond that may copolymerize with an olefinically unsaturated monomer, the polyol is a polyester polyol and/or a polyether polyol, preferably being a polyether polyol. The stable dispersant obtained by means of the described preparation method has a multi-active site anchoring function, and is applied to the synthesis of copolymer polyols to obtain copolymer polyols having relatively uniform particle size.

A macromonomeric stabilizer, a preparation method thereof, a method for preparing a polymeric polyol using same, and the polymeric polyol prepared. Also disclosed are a soft polyurethane foam obtained by foaming a composition of the polymeric polyol prepared and a polyisocyanate, and a molded product comprising the soft polyurethane foam. The preparation method of the macromonomeric stabilizer comprises the following steps: reacting a polyol with a tricarboxylate not comprising a polymerizable ethylenically unsaturated double bond, or a derivative thereof, to form an adduct; and reacting the resulting adduct with an epoxide comprising a polymerizable ethylenically unsaturated double bond. The macromonomeric stabilizer of the present invention has a low viscosity, comprises a plurality of active sites, and can be directly used in subsequent reactions. The preparation method of the macromonomeric stabilizer can be carried out under normal pressure, without the need for end-blocking with ethylene oxide.