CONTINUOUS, SOLVENT-FREE PROCESS FOR MAKING COPOLYMERS OF MALEIC ANHYDRIDE AND C 1-4? ALKYL VINYL ETHER
    22.
    发明授权
    CONTINUOUS, SOLVENT-FREE PROCESS FOR MAKING COPOLYMERS OF MALEIC ANHYDRIDE AND C 1-4? ALKYL VINYL ETHER 有权
    用于生产马来酸酐和C1-4的共聚物连续无溶剂法制? 烷基乙烯基醚

    公开(公告)号:EP1299425B1

    公开(公告)日:2005-10-12

    申请号:EP01930999.6

    申请日:2001-05-02

    CPC classification number: C08F222/06 C08F2/02 C08F216/18 Y02P20/582

    Abstract: A continuous, solvent-free process for obtaining solvent-free, fine white powders of high molecular weight alternating copolymers of maleic anhydride and a C1-C4 alkyl vinyl ether, without odor or taste, having the molecular structure (A-B)n, where A is maleic anhydride, B is an alkyl vinyl ether and n is an integer indicative of the molecular weight of the copolymer, which comprises feeding alkyl vinyl ether as reactant and solvent in excess over the desired 1:1 mole ratio of A:B in the copolymer, molten maleic anhydride and a free radical initiator, continuously at predetermined feeding rates into a reactor heated at a reaction temperature of about 50 DEG to 100 DEG C, holding the reactants in the reactor for a predetermined average residence time, withdrawing reaction product, residual alkyl vinyl ether and initiator at the same rate as the feed rate of reactants into the reactor, stripping residual alkyl vinyl ether from the reaction product, drying the copolymer obtained of any remaining traces of alkyl vinyl ether, and recycling recovered alkyl vinyl ether back into reactor as reactant and solvent.

    STABILIZED AQUEOUS SOLUTION
    26.
    发明授权
    STABILIZED AQUEOUS SOLUTION 失效
    稳定的水溶液

    公开(公告)号:EP0604454B1

    公开(公告)日:1998-10-21

    申请号:EP92916901.9

    申请日:1992-07-31

    CPC classification number: C08K5/005 C08K3/30 C08K5/175 C08L35/08 A61K6/0026

    Abstract: What is provided herein is a stabilized aqueous solution of a C1-C5 alkyl vinyl ether and maleic acid copolymer which includes about 100 to 1,000 ppm of (1) an additive mixture of (a) about 30-70 % by weight of ethylenediaminetetraacetic acid EDTA and (b) about 30-70 % by weight of a secondary additive which is an organic antioxidant and/or free radical scavenger selected from t-butylhydroquinone, propyl gallate and N,N-diethylhydroxylamine; or (2) 10-500 ppm of an inorganic reducing agent such as sulfur dioxide and salts derived from sulfur dioxide and alkali metals such as sodium or potassium bisulfite, sodium or potassium metabisulfite, sodium or potassium thiosulfite, or sodium or potassium sulfite, said stabilized solution exhibiting a retention of at least about 85-90 % of its original viscosity after 3 months.

    POLYMERIC DELIVERY AND RELEASE SYSTEMS FOR ORAL CARE ACTIVES
    27.
    发明授权
    POLYMERIC DELIVERY AND RELEASE SYSTEMS FOR ORAL CARE ACTIVES 有权
    聚合物传递和释放系统用于口腔护理-ACTIVE

    公开(公告)号:EP1635781B1

    公开(公告)日:2007-11-28

    申请号:EP04751626.5

    申请日:2004-05-07

    CPC classification number: A61Q11/00 A61K8/0208 A61K8/8164 A61K2800/57

    Abstract: A polymer for use in an oral care composition which includes a monomer repeat unit containing an active material covalently bonded to a hydrolyzable side group of said monomer unit, and a spacer group positioned between the main chain of said polymer and said hydrolyzable side group, said polymer having a predetermined rapid rate of aqueous hydrolysis to release said active material therefrom.

    CONTINUOUS, SOLVENT-FREE PROCESS FOR MAKING COPOLYMERS OF MALEIC ANHYDRIDE AND C 1-4? ALKYL VINYL ETHER
    29.
    发明公开
    CONTINUOUS, SOLVENT-FREE PROCESS FOR MAKING COPOLYMERS OF MALEIC ANHYDRIDE AND C 1-4? ALKYL VINYL ETHER 有权
    用于生产马来酸酐和C1-4的共聚物连续无溶剂法制? 烷基乙烯基醚

    公开(公告)号:EP1299425A1

    公开(公告)日:2003-04-09

    申请号:EP01930999.6

    申请日:2001-05-02

    CPC classification number: C08F222/06 C08F2/02 C08F216/18 Y02P20/582

    Abstract: A continuous, solvent-free process for obtaining solvent-free, fine white powders of high molecular weight alternating copolymers of maleic anhydride and a C1-C4 alkyl vinyl ether, without odor or taste, having the molecular structure (A-B)n, where A is maleic anhydride, B is an alkyl vinyl ether and n is an integer indicative of the molecular weight of the copolymer, which comprises feeding alkyl vinyl ether as reactant and solvent in excess over the desired 1:1 mole ratio of A:B in the copolymer, molten maleic anhydride and a free radical initiator, continuously at predetermined feeding rates into a reactor heated at a reaction temperature of about 50° to 100 °C, holding the reactants in the reactor for a predetermined average residence time, withdrawing reaction product, residual alkyl vinyl ether and initiator at the same rate as the feed rate of reactants into the reactor, stripping residual alkyl vinyl ether from the reaction product, drying the copolymer obtained of any remaining traces of alkyl vinyl ether, and recycling recovered alkyl vinyl ether back into reactor as reactant and solvent.

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