A composition for preparing polyisocyanurate and polyurethane foams is provided, comprising A) an isocyanate-reactive component, B) a polyisocyanate component and C) a branched siloxane comprising at least three trimethylsiloxy groups. A method for preparing the polyisocyanurate and polyurethane foams, and foams prepared thereby are also provided.

Porous three-dimensional networks of polyurea and porous three-dimensional networks of carbon and methods of their manufacture are described. In an example, polyurea aerogels are prepared by mixing an triisocyanate with water and a triethylamine to form a sol-gel material and supercritically drying the sol-gel material to form the polyurea aerogel. Subjecting the polyurea aerogel to a step of pyrolysis may result in a three dimensional network having a carbon skeleton, yielding a carbon aerogel. The density and morphology of polyurea aerogels can be controlled by varying the amount of isocyanate monomer in the initial reaction mixture. A lower density in the aerogel gives rise to a fibrous morphology, whereas a greater density in the aerogel results in a particulate morphology. Polyurea aerogels described herein may also exhibit a reduced flammability.

Porous three-dimensional networks of polyurea and porous three-dimensional networks of carbon and methods of their manufacture are described. In an example, polyurea aerogels are prepared by mixing an triisocyanate with water and a triethylamine to form a sol-gel material and supercritically drying the sol-gel material to form the polyurea aerogel. Subjecting the polyurea aerogel to a step of pyrolysis may result in a three dimensional network having a carbon skeleton, yielding a carbon aerogel. The density and morphology of polyurea aerogels can be controlled by varying the amount of isocyanate monomer in the initial reaction mixture. A lower density in the aerogel gives rise to a fibrous morphology, whereas a greater density in the aerogel results in a particulate morphology. Polyurea aerogels described herein may also exhibit a reduced flammability.

The present invention relates to a curable isocyanate-free formulation for preparing a polyurethane self-blowing foam comprising at least one multifunctional cyclic carbonate having at least two cyclic carbonate groups at the end of the chain (compound A), at least one multifunctional amine (compound B), at least one multifunctional thiol (compound C) and at least one catalyst (compound D), to a process for preparing said foams, to the thus obtained foams and the recycling of said foams.

A curative for epoxidized plant-based oils and epoxidized natural rubber is created from the reaction between a naturally occurring polyfunctional acid and an epoxidized plant-based oil is disclosed. The curative may be used to produce at least one of six different materials, wherein each type of material may be configured as a thermosetting elastomer that is crosslinked with β-hydroxyester linkages. The materials may be configured as a leather-like material, a foam material, a molded elastomer, a coating, an adhesive, and/or a rigid or semi-rigid material. Illustrative articles made from any combination of the six materials may be recycled using a mechano-chemical process to de-crosslink the thermosetting elastomer.

Organosilicon polymer foams are synthesized using a Carboni-Lindsey reaction of a tetrazine with a siloxane polymer having at least one of alkenyl or alkynyl functional groups. Optionally, the reaction may also comprise a second polymer having at least one of alkenyl or alkynyl functional groups. The organosilicon polymer foams may be crosslinked thermoset foams. The foams may be flexible or rubbery.

Organosilicon polymer foams are synthesized using a Carboni-Lindsey reaction of a tetrazine with a siloxane polymer having at least one of alkenyl or alkynyl functional groups. Optionally, the reaction may also comprise a second polymer having at least one of alkenyl or alkynyl functional groups. The organosilicon polymer foams may be crosslinked thermoset foams. The foams may be flexible or rubbery.

The present invention provides a two-component foamable silicone composition comprising: a component A comprising (a) at least one polyorganosiloxane having at least one vinyl group, (b) at least one chemical blowing agent, and (c) at least one catalyst; and a component B comprising (d) at least one polyorganosiloxane having at least one vinyl group, and (e) at least one polyorganosiloxane having at least one —SiH group, and at least one expandable graphite in an amount of less than 10% by weight, based on the total weight of the component B, which exhibits excellent flame retardancy, good sealing performance, high compression rate, low gasket density, good dispensing continuity and good cell structure. The present invention also provides a preparing method and use thereof.

The present invention provides a two-component foamable silicone composition comprising: a component A comprising (a) at least one polyorganosiloxane having at least one vinyl group, (b) at least one chemical blowing agent, and (c) at least one catalyst; and a component B comprising (d) at least one polyorganosiloxane having at least one vinyl group, and (e) at least one polyorganosiloxane having at least one —SiH group, and at least one expandable graphite in an amount of less than 10% by weight, based on the total weight of the component B, which exhibits excellent flame retardancy, good sealing performance, high compression rate, low gasket density, good dispensing continuity and good cell structure. The present invention also provides a preparing method and use thereof.

HCFO-containing isocyanate-reactive compositions, foam-forming compositions containing such isocyanate-reactive compositions, rigid PUR-PIR foams made using such foam-forming compositions, and methods for producing such foams, including use of such foams as insulation in discontinuous foam panel applications. The isocyanate-reactive composition includes a polyol blend, a blowing agent composition, and a tertiary amine catalyst. The polyol blend includes: (1) an aromatic polyester polyol having a functionality of 1.5 to less than 2.5 and an OH number of 150 to 360 mg KOH/g; (2) an aromatic polyester polyol having a functionality of at least 2.5 and an OH number greater than 360 mg KOH/g, which is present in an amount of at least 10% by weight, based on the total weight of the aromatic polyester polyol in the polyol blend; and (3) an amine-initiated polyether polyol having an OH number of at least 500 mg KOH/g and a functionality of 2.5 to 4. The blowing agent composition includes a hydrochlorofluoroolefin and a carbon dioxide generating chemical blowing agent.