Abstract:
Particulate expandable styrene polymers having a short minimum mold resistance time and characterized by a coating of an amide of phthalic acid, dihydrophthalic acid or tetrahydrophthalic acid.
Abstract:
PROBLEM TO BE SOLVED: To provide a water-absorbing foamy crosslinked polymer. SOLUTION: The process for producing the polymer comprises a first step (I) of foaming a polymerizable aqueous mixture of (a) a monoethylene unsaturated monomer having an acid radical in which at least its 50 mol% is neutralized, (b) optionally other monoethylene unsaturated monomer, (c) a crosslinking agent, (d) an initiator, (e) 0.1-20 wt.% of at least one kind of surfactant, (f) optionally at least one kind of solubilizer, and (g) optionally, a thickener, foam stabilizer, polymerization regulator, filler and/or foam nucleus-forming agent, and of dispersing fine foams of inactive gas into the radical to carry out foaming, and a second step (II) of forming a foamy hydrogel and optionally adjusting a water content of the foamy polymer to 1-60 wt.% to polymerize the foamed mixture. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
Particulate styrene polymers which contain a blowing agent and are surface-coated with from 0.05 to 1% by weight of an ester. The coating agent is an ester of citric acid and alcohols fo 10 to 20 carbon atoms; tristearyl citrate is a preferred ester. The styrene polymers can be used to produce foam moldings, with short mold dwell times and good welding of the foam particles.
Abstract:
Particulate self-extinguishing thermoplastic molding compositions based on styrene polymers containing volatile blowing agents are surface-coated with an organic bromine compound and, to stabilize the bromine compound against photodegradation, a N-hydroxyphenylbenzotriazole or a hydroxybenzophenone. The molding compositions may be used for the manufacture of foams by expanding the blowing agents at elevated temperatures.
Abstract:
1396949 Coated expandable polymer particles BADISCHE ANILIN-& SODA-FABRIK AG 4 Aug 1972 [7 Aug 1971] 36498/72 Heading B2E [Also in Division C3] Coated particulate expandable styrene polymers are made by coating particles of the expandable polymer with 0.05-2% by wt. of the polymer, of a carboxamide or mixture thereof of m.p. 60-110‹C and of formula: RCONHR' where R is a C 7-21 alkyl or alkenyl group and R' is a C 8-22 alkyl or alkenyl group. In the examples beads or granulates of polystyrene containing pentane are coated with powdered stearic, behenic, myristic or oleic N- stearylamide, stearic N-oleylamide, stearic N-2- ethylhexylamide, or behenic or myristic N-laurylamide. The coated particles may be pre-expanded with steam, stored and then expanded in a mould with steam.
Abstract:
Expandable styrene polymers, containing …… a) a styrene polymer … b) from 1 to 10% by weight, based on a), of a saturated C3- to C6-hydrocarbon as blowing agent, and optionally … c) conventional assistants in effective amounts, … characterised in that the benzene content is less than 1 ppm and the styrene content is less than 2000 ppm.
Abstract:
Particulate styrene polymers containing blowing agents are prepared by a process in which an aliphatic hydrocarbon of 7 to 9 carbon atoms is added in an amount of from 0.01 to 0.5% by weight, based on the styrene polymer, before, during or after the polymerization. The particulate styrene polymers can be processed to foam blocks and moldings having a satisfactory smooth surface.
Abstract:
Particulate expandable styrene polymers which contain from 0.0001 to 0.2% by weight, based on the styrene polymer, of an inhomogeneously distributed nucleating agent for expandable polystyrene, the nucleating agent being present only in a peripheral zone of the particles whilst the interior of the particles is free from nucleating agent. Nucleating agents which may be used are organic compounds having at least three bromine atoms, bonded to aliphatic or cycloaliphatic structures, in the molecule, or bromine compounds which are polymerizable, or are copolymerizable with styrene.