A composition for forming a foamed silicone elastomer is disclosed. The composition comprises: A) an organopolysiloxane having at least two silicon-bonded ethylenically unsaturated groups per molecule; B) an organohydrogensiloxane having at least two silicon-bonded hydrogen atoms per molecule; C) a hydrosilylation catalyst; D) a chemical blowing agent; and E) a physical blowing agent. The hydrosilylation catalyst C) is present in a catalytically effective amount. The chemical blowing agent D) has at least one hydroxyl (OH) group, and is present in an amount to provide a OH content >0 and <500 parts per million (ppm). The physical blowing agent E) undergoes a phase change from a liquid to a gaseous state during exposure to atmospheric pressure and a temperature ≥0° C. The blowing agents D) and E) are different from one another. A foamed silicone elastomer, and methods of forming the composition and foamed silicone elastomer are also disclosed.

Green, fast and easy evaporating organic solvent for use as a lubricant in the processing of polytetrafluoroethylene (PTFE) and expanded polytetrafluoroethylene (ePTFE) products and processes of using the solvents to fabricate the products are disclosed herein. The products can be used in the field of bio- and medical applications, such as for use in vascular grafts, cardiovascular and soft tissue patches, facial implants, surgical sutures, and endovascular prosthesis, and for any products known in the aerospace, electronics, fabrics, filtration, industrial and sealant arts.

Methods, foams and blowing agents for producing thermoplastic foam having low aged lambda and low foam density, wherein the blowing agent comprises: (a) from about 50% by weight to about 70% by weight of an HFO and/or an HFCO having three atoms; (b) a first co-blowing agent consisting essentially of from about 2% to about 15% by weight of methyl formate; (c) a second co-blowing agent consisting essentially of from about 20% to about 30% by weight of dimethyl ether, isobutane and combinations of these; and (d) a third co-blowing agent consisting essentially of from about 2% to about 25% by weight of carbon dioxide, acetone and combinations of these.

The present invention relates to compositions for use in refrigeration, air-conditioning, and heat pump systems wherein the composition comprises a fluoroolefin and at least one other component. The compositions of the present invention are useful in processes for producing cooling or heat, as heat transfer fluids, foam blowing agents, aerosol propellants, and fire suppression and fire extinguishing agents.

The invention relates to a method of preparing sub-micron biocarbon materials using biomass that is chemically modified with organic or inorganic agents including but not limited to acrylamide, glycine, urea, glycerol, bio-glycerol, corn syrup, succinic acid, and sodium bicarbonate. The use of foaming and heating methodologies which could be either pre or post carbonization and subsequent particle size reduction methodologies for the creation of cost-competitive sub-micron biocarbon particles and fibers for a variety of applications.

This invention relates to thermoset, thermal insulating panel, pour-in-place and pour-in-place foams having desirable and unexpectedly low thermal conductivity, and to compositions, method and systems which use and/or are used to make such foams comprising: (a) providing thermosetting foam forming component and a blowing agent for forming predominantly closed cells in the foam, wherein the blowing agent comprises: (i) cis-1,1,1,4,4,4-hexafluoro-2-butene (HFO-1336mzzm(Z)) and cyclopentane, with the HFO-1336mzzm(Z) and cyclopentane in the blowing agent together comprising at least about 50% by weight of the total of all components in the blowing agent and (ii) the weight ratio of HFO-1336mzzm(Z) to cyclopentane in the blowing agent is from about 45:55 to less than 68:32 and (b) forming foam from said provided foamable composition.

Polymer foams based on polyetherimides (PEI) meet the legal requirements of the aerospace industry for both the interior and exterior of aircraft.

The present invention relates to a process for the manufacture of foamed polymeric material characterised by the presence of two or more cellular layers and aggregates that exhibit variations in cell size and cell density distribution. The heterogeneous polymeric material is foamed using a single expansion step, thus eliminating the assembly steps and improving the mechanical proprieties of the foam. The invention allows producing custom foam with predefined profiles of cell size, cell density distribution, and with correlated variations of its physical properties. The key to this invention is that the polymer material before expansion is made in multiple polymerisation steps from the original monomers. In each polymerisation step, a different recipe of monomers and physical blowing agents' concentration is used. These recipes within the final polymer material will expand under the same temperature to produce various aggregates of cell sizes and cell distribution in the final foam.

A polyetherimide-based foam contains specific amounts of a nucleating agent and a polyetherimide having a weight average molecular weight of 30,000 to 80,000 grams per mole and a dispersity of 2.7 to 4.5. The foam has a density of 20 to 60 kilograms per meter3, and a closed cell content of 80 to 100 percent. The foam can be prepared by a method that combines the nucleating agent and polyetherimide with a blowing agent that includes specific amounts of acetone and methanol. Also described are articles that include the foam.

Disclosed are such co-polymers of vinylidene substituted aromatic monomers and unsaturated compounds containing nucleophilic groups chain extended by a copolymer of one or more vinylidene aromatic monomers and one or more unsaturated compounds having pendant electrophilic groups which copolymerize with the one or more vinylidene aromatic monomers. Disclosed are compositions comprising vinylidene substituted aromatic monomers and unsaturated compounds containing nucleophilic groups and a copolymer of one or more vinylidene aromatic monomers and one or more unsaturated compounds having pendant electrophilic groups, which may optionally, contain salts of alkaline earth metals, alkali metals, transition metals, post transition metals or metalloids. Disclosed are methods of preparing such chain-extended and/or branched copolymers.