The present invention provides a melamine resin foam comprising at least one halogen-free flame retardant selected from phosphine oxide, phosphinate or phosphonate, a process for producing a melamine resin foam comprising heating and foaming an aqueous mixture M using microwave radiation, said mixture M comprising at least one melamine-formaldehyde precondensate, at least one halogen-free flame retardant, selected from phosphine oxide, phosphinate or phosphonate, at least one curative, at least one surfactant and at least one blowing agent as well as the use of the melamine resin foam for acoustic and/or thermal insulation.

The invention discloses a method for recycling and reprocessing of polyurethane foams based on acetoxime. The method comprises three steps: (1) Polyurethane foams are degraded into functionalized oligomers and/or small molecular compounds by adding acetoxime. (2) The obtained degradation products from step (1) are dispersed into acetoxime, and then are melted above the melting point of acetoxime, followed by being cooled down below the melting point of acetoxime, thus obtaining a mixture. (3) The mixture from step (2) is reprocessed into new polyurethane foams by vacuum sublimation. With this method, polyurethane wastes can be recycled and reprocessed into new foams and 3D printing products without consuming any reagent, or changing existing products and production infrastructures.

Storage-stable two-component polyurethane or polyisocyanurate spray foam compositions are disclosed, said compositions comprising: (a) an A-side component comprising one or more polyisocyanate and one or more blowing agent; and (b) a B-side component comprising one or more polyol and one or more blowing agent comprising pressurized gaseous carbon dioxide and one or more liquid blowing agent; wherein both the A-side component and the B-side component, separately, generate less than 300 ppm of fluoride ion after one week of aging at 50 C.

Methods of forming a lightweight reinforced thermoplastic core layer and articles including the core layer are described. In some examples, the methods use a combination of thermoplastic material, reinforcing fibers and bicomponent fibers to enhance retention of lofting agents in the core layer. The processes permit the use of less material while still providing sufficient lofting capacity in the final formed core layer.

Molded foam articles comprising polylactic acid and one or more additives are described herein. The additives may include iron oxide, iron hydroxide, titanium dioxide, zinc oxide, or another additive. The additives advantageously enable the formation of a molded foam article with a lower density without loss in mechanical or thermal performance and, in some cases, improved thermal performance due to advantageous circularity properties of the molded foam beads.

A two-part system comprising a first component including one or more epoxy resins or epoxy-functionalized resins and a second component including one or more phosphate esters, wherein the first component and second component are liquid at room temp and upon mixing the first component with the second component at room temperature, a composition is formed that is solid.

Method for lowering the formaldehyde emissions of melamine/formaldehyde polymer moldings, films or fibers by impregnating the melamine/formaldehyde polymer moldings, films or fibers with an aqueous solution of at least one formaldehyde scavenger.

A two-part system comprising a first component including one or more epoxy resins or epoxy-functionalized resins and a second component including one or more phosphate esters, wherein the first component and second component are liquid at room temperature and upon mixing the first component with the second component at room temperature, a composition is formed that is solid.

Storage-stable two-component polyurethane or polyisocyanurate spray foam compositions are disclosed, said compositions comprising: (a) an A-side component comprising one or more polyisocyanate and one or more blowing agent; and (b) a B-side component comprising one or more polyol and one or more blowing agent comprising pressurized gaseous carbon dioxide and one or more liquid blowing agent; wherein both the A-side component and the B-side component, separately, generate less than 300 ppm of fluoride ion after one week of aging at 50 C.

Provided are a dielectric material and a method for manufacturing the same. The dielectric material includes: subjecting a foamed sphere obtained by a primary foaming to a second foaming in a second moulding chamber filled with CO.sub.2 at a second temperature in the range of 20 C. below T.sub.m to 5 C. below T.sub.m and under a second pressure of 15-20 MPa for 30-3600 min to obtain the dielectric material, wherein the primary foaming comprises specific steps of: foaming a foaming material sphere with a diameter of 20-800 mm in a first moulding chamber filled with CO.sub.2 at a first temperature in the range of 80 C. below T.sub.m to 20 C. below T.sub.m and under a first pressure of 15-20 MPa to obtain the foamed sphere. Further provided is a dielectric material manufactured by the method above.