Abstract:
Composition comprenant au moins une coupe hydrocarbonée d'origine pétrolière ou issue de la conversion de la biomasse (a) et au moins un copolymère (b) résultant de la copolymérisation de : au moins un monomère choisi parmi : l'acide acrylique et l'un quelconque de ses sels, éventuellement au moins un monomère choisi parmi : l'acide méthacrylique et l'un quelconque de ses sels, au moins un monomère choisi parmi les monomères de formule (I) : R - X - R' (I) selon laquelle R représente une fonction insaturée polymérisable, R' désigne l'hydrogène ou un groupe alkyle ayant de 1 à 4 atomes de carbone, X représente une structure comportant n unité(s) d'oxyde d'éthylène OE et m unité(s) d'oxyde de propylène OP, m et n sont 2 entiers allant de 0 à 150, dont un au moins est non nul.
Abstract:
A seal for a valve for use in a pharmaceutical dispensing device, which seal comprises: (a) a first elastomer based on an ethylene-propylene-diene terpolymer, which terpolymer comprises from 45 to 55 wt.% ethylene, from 40 to 50 wt.% propylene, and ENB (ethylidenenorbornene) in an amount of 0.5 to 6 wt.%, wherein the terpolymer has a Mooney Viscosity (ML 1 + 4, 125º C) of from 10 to 30; and (b) a second elastomer based on an ethylene-propylene-diene terpolymer, which terpolymer comprises from 45 to 55 wt.% ethylene, from 40 to 50 wt.% propylene, and ENB (ethylidenenorbornene) in an amount of 0.5 to 6 wt.%, wherein the terpolymer has a Mooney Viscosity (ML 1 + 4, 125º C) of from 60 to 80.
Abstract:
The invention relates to an efficient process for the preparation and isolation of rubber particles formed in aqueous media and highly pure rubbers obtained thereby. The invention further relates to copolymer products comprising the same or derived therefrom.
Abstract:
Joints in an electrical cable are made by joining the ends of the conductors of two cables and applying and then curing a reaction mixture over the joint to form an elastomeric seal. The reaction mixture includes a carbon-Michael acceptor compound, a carbon-Michael donor compound and a carbon-Michael reaction catalyst.
Abstract:
A method and compositions are described which improve extrusion- and creep- resistance of components for use in a high temperature applications including sealing elements and seal connectors among others. The method includes providing a composition having an aromatic polymer and a crosslinking compound, and subjecting the composition to a heat molding process to form the component and crosslink the aromatic polymer.
Abstract:
The present invention provides aqueous caulk or sealant compositions that are substantially free of any plasticizer comprising an aqueous emulsion copolymer having a broad measured glass transition temperature by differential scanning calorimetry (DSC), soft phases and hard phases, and two separate Tan Delta transition temperatures as measured by dimensional mechanical analysis (DMA), (ii) one or more filler in a filler to binder ratio of up to 4:1, and (iii) from 0.2 to 5 wt.% as solids, based on the total weight of the composition, of one or more thickener or rheology modifier. In addition, the invention provides methods of making the composition comprising polymerizing by gradually adding from a flask into a polymerization vessel a soft monomer composition, and, after feeding at least 20 wt.% of such composition in the vessel, gradually adding into the flask a hard comonomer composition, feeding all flask contents into the vessel and polymerizing.