Pearl-shaped, expandable styrene polymers containing sterically hinhibited phenols

    公开(公告)号:AU7694994A

    公开(公告)日:1995-04-10

    申请号:AU7694994

    申请日:1994-09-07

    Applicant: BASF AG

    Abstract: Pearl-shaped, expandable styrene polymers contain (a) a styrene polymer; (b) 0.03 to 1.5 % by weight, in relation to (a), of a sterically inhibited phenol homogenously distributed in the styrene polymer and/or applied as a coating on the surface of the styrene polymer; (c) an expanding agent or mixture of expanding agents; and if required (d) effective amounts of usual additives. Also disclosed is a process for producing said polymers, according to which styrene, if required with other comonomers, is polymerised in an aqueous suspension in the presence of suspension stabilisers and usual styrene-soluble polymerisation catalysts, with addition of an expanding agent or mixture of expanding agents, and if required of an effective amount of usual additives and of up to 1.5 % by weight, in relation to styrene and comonomers, of sterically hindered phenols. The thus obtained pearl-shaped, expandable styrene polymers are coated with up to 1.5 % by weight, in relation to the expanding agent-free styrene polymer, of sterically inhibited phenols, provided that the expandable styrene polymers that are homogenously distributed in the styrene polymer and/or applied as a surface coating contain in total 0.03 to 1.5 % by weight of sterically inhibited phenols, in relation to the styrene polymer.

    Oil-resistant, expandable styrene polymers

    公开(公告)号:AU641294B2

    公开(公告)日:1993-09-16

    申请号:AU8824091

    申请日:1991-11-28

    Applicant: BASF AG

    Abstract: Oil-resistant expandable styrene polymers containing …… a) from 10 to 90% by weight of uncrosslinked polystyrene and/or an uncrosslinked styrene copolymer containing at least 50% by weight of copolymerised styrene, … b) from 10 to 90% by weight of a crosslinked styrene polymer which contains at least 0.1% by weight, but less than 2% by weight, of a copolymerised monomer containing at least two olefinic double bonds, … c) from 1 to 10% by weight, based on the sum of a) and b), of a C3- to C6-hydrocarbon as blowing agent, and optionally … d) conventional additives in effective amounts, … where the mixture of a) and b) has a melt flow index MFI (200 DEG C, 5.0 kp) in accordance with DIN 53 735 of between 1 and 20 [g/10 min].

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