The present invention relates to a method for preparing a polyurethane foam, in particular an aerogel, from at least one polyisocyanate and at least one optionally recycled polyol, and to the use thereof.

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.

An embodiment includes individual SMP foams that radially expand and fill gaps around a heart valve that may be improperly seated, in an unusual cross section, or has poor apposition against a calcified lesion. Other embodiments are described herein.

Provided are a modified polyether polyol and the use thereof in polyurethane foam materials. The method for preparing a modified polyether polyol comprises the following steps: 1) reacting a compound A with a polyether polyol, wherein the compound A is an anhydride and/or dicarboxylic acid compound containing a polymerizable double bond, preferably selected from one or two of maleic anhydride and itaconic anhydride, preferably maleic anhydride; and 2) reacting the product obtained in step 1) with an epoxy compound containing a polymerizable double bond in the presence of a catalyst, in order to prepare the modified polyether polyol. The modified polyether polyol obtained by means of the preparation method has more active sites, uses the polymerizable double bond for blocking, is used as a dispersion stabilizer for the synthesis of copolymer polyols, and has the characteristics of a better dispersion stability, filterability and a low viscosity.

An embodiment includes individual SMP foams that radially expand and fill gaps around a heart valve that may be improperly seated, in an unusual cross section, or has poor apposition against a calcified lesion. Other embodiments are described herein.

A polymerizable composition comprising a) at feast one cyclic amide, b) from 2.8 to 3.5% by weight, preferably from 2.9 to 3.1% by weight, of at least one blocked polyisocyanate, and c) from 1.2 to 1.4% by weight of at least one catalyst for the polymerization of the cyclic amide,
where the ratio by weight of components b) to c) is from 2.0 to 2.9 and the % by weight data are always based on the entirety of components a) to c).

Provided are a modified polyether polyol and the use thereof in polyurethane foam materials. The method for preparing a modified polyether polyol comprises the following steps: 1) reacting a compound A with a polyether polyol, wherein the compound A is an anhydride and/or dicarboxylic acid compound containing a polymerizable double bond, preferably selected from one or two of maleic anhydride and itaconic anhydride, preferably maleic anhydride; and 2) reacting the product obtained in step 1) with an epoxy compound containing a polymerizable double bond in the presence of a catalyst, in order to prepare the modified polyether polyol. The modified polyether polyol obtained by means of the preparation method has more active sites, uses the polymerizable double bond for blocking, is used as a dispersion stabilizer for the synthesis of copolymer polyols, and has the characteristics of a better dispersion stability, filterability and a low viscosity.

The present disclosure relates to a method for making a non-isocyanate polyurethane (NIPU) foam, where the method includes decomposing a blowing agent having at least one of an amine carbamate salt and/or an amine bicarbonate salt to form a diamine and CO.sub.2 in the presence of a molecule comprising a plurality of cyclic carbonate functional groups and reacting the diamine with at least a portion of the cyclic carbonate functional groups to form the NIPU foam. In some embodiments of the present disclosure, the reacting and the decomposing may occur at substantially the same rate.

A flexible polyurethane foam comprises up to 10 wt % of a fumed silica having a surface area from 50 to 150 m.sup.2/g, wherein the fumed silica has C1-C3 alkylsilyl groups at its surface, the flexible polyurethane foam exhibiting has a resilience of at least 40%, for example, from 40% to 70%, a dry compression set no greater than 15%, for example, from 3% to 15%, or both. Alternatively in addition, the flexible polyurethane foam may have a compression force deflection at 50% as measured by ASTM D3574 that is at least 30%, for example, at least 50%, at least 70%, or from 30% to 155%, greater than a flexible polyurethane foam having the same composition but with polyol replacing the silica.

Polymers are disclosed that incorporate portions of secondary or tertiary polyamide segments connected with polyisocyanates. These polymers have enhanced matting properties. The enhanced matting properties are from creating an inherently matt surface from the polymer without the use of any separate fine particle size matting additives. Conventional matting agents such as fine particle size silica usually results in loss of physical properties such as haze development and porosity in the coating from the matting agent. Composites and hybrids of these polymers and other polyamides, polyurethane with vinyl polymers (acrylates) are also disclosed and claimed.