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    34.
    发明专利
    未知

    公开(公告)号：BRPI0721108A2

    公开(公告)日：2014-03-04

    申请号：BRPI0721108

    申请日：2007-12-17

    Applicant: BASF SE

    Inventor： TABOADA LIDCAY HERRERA ,  GUZMANN MARCUS ,  NEUBECKER KARIN ,  GOETHLICH ALEXANDER

    IPC: C08F8/40 ,  C02F5/14 ,  C08F210/00 ,  C08F222/04 ,  C09K8/12

    Abstract: The present invention relates to a process for preparing a phosphorus-containing polymer, comprising the steps of (i) copolymerizing at least (a) monoethylenically unsaturated dicarboxylic anhydrides having from 4 to 6 carbon atoms with (b) olefins of the formula CH2═C(R1)R2 where R1 is H or CH3 and R2 is H, CH3, C2H5 or phenyl; (ii) reacting the polymer formed in step (i) with at least one primary or secondary phosphorus-containing amine or a phosphorus-containing alcohol and (iii) at least partly ring-opening the remaining anhydride groups. The invention further relates to phosphorus-containing polymers obtainable from this process, and to processes for preventing Ba/Sr scale with the aid of the polymer.

    GRAFT COPOLYMER AS A GAS HYDRATE INHIBITOR
    35.
    发明专利
    GRAFT COPOLYMER AS A GAS HYDRATE INHIBITOR 未知

    公开(公告)号：CA2703789C

    公开(公告)日：2013-04-30

    申请号：CA2703789

    申请日：2008-12-05

    Applicant: BASF SE

    Inventor： REICHENBACH-KLINKE ROLAND ,  NEUBECKER KARIN

    IPC: C08F290/14 ,  C09K8/524

    Abstract: Graft copolymers based on a polyamide which was reacted with maleic anhydride and which has at least one vinylically unsaturated side chain are proposed, this grafted side chain containing at least one representative selected from a) N-vinylcaprolactam and/or b) N-vinylpyrrolidone. Inter alia, natural but also synthetic polyamides are provided as preferred polyamide components. Such graft copolymers, but also generally polyamide-based graft copolymers composed of at least one side chain containing ethylenically unsaturated compounds, are in general suitable in construction chemistry applications but also in the development, exploitation and completion of underground mineral oil and natural gas deposits and in deep wells and moreover in the extraction and the transport of oil or gas and here in particular as a gas hydrate inhibitor.

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