Abstract:
Composition de caoutchouc thermo-expansible, utilisable notamment en bande de roulement de pneumatique, comportant au moins : - un élastomère diénique; - une charge renforçante; - entre 2 et 25 pce d'un agent d'expansion; - entre 2 et 25 pce d'un acide carboxylique dont la température de fusion est comprise entre 60°C et 220°C; - un système de réticulation à base de soufre et de 5 à 15 pce d'un accélérateur de vulcanisation; - le ratio pondéral (acide carboxylique / accélérateur) étant inférieur à 2,0. Procédé d'obtention d'une telle composition et pneumatique la comportant. Cette composition permet de réduire le bruit de roulage des pneumatiques sans pénaliser leur résistance au roulement.
Abstract:
An absorbent article containing a polyolefin film is provided. The polyolefin film is formed by a thermoplastic composition containing a continuous phase that includes a polyolefin matrix polymer and nanoinclusion additive is provided. The nanoinclusion additive is dispersed within the continuous phase as discrete nano-scale phase domains. When drawn, the nano-scale phase domains are able to interact with the matrix in a unique manner to create a network of nanopores.
Abstract:
Monomodal foamed polymeric compositions containing clay nucleating agents are described. The clays are preferably sepiolite, palygorskite/attapulgite, or combinations thereof. Also described are processes for forming the foamed compositions.
Abstract:
The present disclosure is directed to a composition and articles containing the composition. The composition comprises a foam and a plurality of gel particles dispersed in the foam. The gel particles comprise an olefin block copolymer and an oil.
Abstract:
The invention relates to a fire-resistant polyurethane material comprising a foamed polyurethane main body, a fire-resistant inorganic powder and a hollow structure. The density of the hollow structure is lower than about 0.1 g/cm and the material of the hollow structure is selected from the group consisting of polymer, glass and ceramic. The fire-resistant polyurethane material according to the invention has excellent fire-resistant effects. The invention also provides a fire-resistant structure.
Abstract:
The present invention relates to a reactive formulation used to make a flame resistant flexible polyurethane foam with reduced odor which is particularly suited for use in under the hood vehicle applications which require sound deadening and vibration management and a process to make said foam. Said foam is particularly suitable for such applications because desirable flame resistant properties are achieved after exposure to heat over an extended period of time. In particular, the flame resistant flexible polyurethane foam is made from a reactive formulation comprising an A side comprising (i) one or more organic isocyanate and a B side comprising (ii) one or more isocyanate-reactive component, (iii) a flame retardant component comprising a combination of red phosphorus, expandable graphite, and optionally sodium citrate wherein the flame retardant component does not contain ammonium polyphosphate; (iv) one or more additional component selected from a catalyst, a blowing agent, a cell opener, a surfactant, a crosslinker, a chain extender, a filler, a colorant, a pigment, an antistatic agent, reinforcing fibers, an antioxidant, a preservative, or an acid scavenger, and (v) a non-halogen containing copper compound wherein the resulting foam achieves after heat aging at 150°C for seven days a V-0 rating at 0.5 inch according to Underwriters' Laboratories Standard 94 Flammability Test.
Abstract:
A method comprising contacting a first styrenic polymer composition comprising residual styrene monomer with a molecular sieve, and recovering a second styrenic polymer composition comprising a reduced amount of residual styrene monomer A composition compπsing a styrenic polymer having a residual styrene monomer amount of less than 100 ppm produced by contacting a styrenic polymer composition having a residual styrene monomer amount of equal to or greater than 100 ppm with a molecular sieve, and recovering the styrenic polymer having a residual styrene monomer amount of less than 100 ppm A method comprising providing a styrenic polymer composition having a residual styrene monomer amount of equal to or greater than 100 ppm, contacting the styrenic polymer composition with a molecular sieve, adding a nucleating agent, a foaming agent, and a coloring agent, and forming an expanded styrenic polymer composition having a residual styrene monomer amount of less than 100 ppm
Abstract:
L'invention concerne une composition thermodurcissable pour pièces composites résistantes au feu ou intumescentes, exempte de tout additif halogène et de structure halogénée dans ses composants et qui comprend : a) 100 parties en poids de résine sèche, comprenant a1) : un polyester insaturé d'indice d'acide inférieur à 10, et/ou a2) : un vinyl ester, b) 40 à 200 parties en poids d'un diluant réactif parmi les monomères éthyléniquement insaturés, c) 20 à 110 parties en poids d' un agent d'expansion thermique, parmi : mélamine et ses dérivés, guanidine, glycine, urée, triisocyanurates, azodicarbonamide, d) 0 à 250 parties en poids de trihydrate d'Aluminium, e) 10 à 80 parties en poids d'un agent précurseur de carbonisation parmi les polyols multifonctionnels, f) 50 à 200 parties en poids d'un composé parmi un dérivé phosphore et/ou un dérivé d'acide borique, g) en option, au moins un oxyde métallique, h) en option, autres additifs et charges, i) en option, des renforts à base de fibres naturelles ou synthétiques et tissus correspondants, et avec le composant acide du polyester al) constitué d'au moins 60% en mol d'acide et/ou anhydride maléique et le composant polyol d'au moins 70% en mol de propylène glycol. Ces compositions sont utilisées dans le domaine du transport, du bâtiment, des travaux publics, du génie civil et des loisirs ou mobiliers urbains avec des pièces composites ou revêtements intumescents remplissant au moins le critère HL2 selon l'exigence R1 de prCEN/TS 45545-2:2008.
Abstract:
A method of producing a low smoke and heat releasing, non-corrosive phenolic resole foam composition of uniform density which is rigid and has increased load-bearing capabilities and decreased susceptibility to cracking. The foam is formed by mixing with a phenolic resole, a first surfactant selected from the group of alkylated-alkoxylated phenols, a second surfactant selected from the group of silicone glycol copolymers, a blowing agent and a catalyst. The resultant mixture is molded in a preheated mold utilizing selective location and temperature heating of the mold. The molded foam structure is exposed to ammonia vapors to neutralized the residual acidity therein and the neutralized structure is heat-cured.