3.
    发明专利
    未知

    公开(公告)号:AT356896B

    公开(公告)日:1980-05-27

    申请号:AT598477

    申请日:1977-08-18

    Abstract: Process for preparing low molecular weight, light weight and high molecular weight xylene-formaldehyde thermoplastic polymers, comprising reacting formaldehyde or a formaldehyde producing material with xylene in the presence of an acid catalyst at an elevated temperature in a closed reactor of the which excludes air during the reaction. (Machine-translation by Google Translate, not legally binding)

    4.
    发明专利
    未知

    公开(公告)号:NO162522B

    公开(公告)日:1989-10-02

    申请号:NO845235

    申请日:1984-12-27

    Abstract: A method for increasing the viscosity of a solution of a preformed polymer which comprises combining, under conditions favourable to microbial growth, (a) an aqueous solution of the preformed polymer; and (b) a microorganism incapable of de novo synthesis of the polymer, but capable of increasing the viscosity of the polymer solution is disclosed. The present invention may be applied, for example, to oil recovery, water clarification and paper production. Polymers which may be treated by this method include guar gum, hydroxypropyl guar gum, sodium carboxymethyl cellulose, hydroxyethyl cellulose, carboxymethyl hydexyethyl cellulose, xanthan gum, scleroglucan, locust bean gum, polyacrylamide, hydrolyzed polyacrylamide, poly (acrylic acid) and its salts, poly (2-acrylamido-2-methyl propane sulphuric acid (2 salt, ANPS), poly (acrylic acid-co-acrylate ester), poly (vinyl pyrrolidane), cellulose sulphate esters, poly (ethylene oxide), poly (vinyl alcohol), polyamine, poly (vinyl acetate-co-maleic anhydride) and poly (styrene sulphonic acid) and salts thereof.

    6.
    发明专利
    未知

    公开(公告)号:DE2736761A1

    公开(公告)日:1978-03-02

    申请号:DE2736761

    申请日:1977-08-16

    Abstract: Process for preparing low molecular weight, light weight and high molecular weight xylene-formaldehyde thermoplastic polymers, comprising reacting formaldehyde or a formaldehyde producing material with xylene in the presence of an acid catalyst at an elevated temperature in a closed reactor of the which excludes air during the reaction. (Machine-translation by Google Translate, not legally binding)

    MICROBIAL ENHANCEMENT OF POLYMER VISCOSITY

    公开(公告)号:GB2153834B

    公开(公告)日:1986-11-12

    申请号:GB8432161

    申请日:1984-12-20

    Abstract: A method for increasing the viscosity of a solution of a preformed polymer which comprises combining, under conditions favourable to microbial growth, (a) an aqueous solution of the preformed polymer; and (b) a microorganism incapable of de novo synthesis of the polymer, but capable of increasing the viscosity of the polymer solution is disclosed. The present invention may be applied, for example, to oil recovery, water clarification and paper production. Polymers which may be treated by this method include guar gum, hydroxypropyl guar gum, sodium carboxymethyl cellulose, hydroxyethyl cellulose, carboxymethyl hydexyethyl cellulose, xanthan gum, scleroglucan, locust bean gum, polyacrylamide, hydrolyzed polyacrylamide, poly (acrylic acid) and its salts, poly (2-acrylamido-2-methyl propane sulphuric acid (2 salt, ANPS), poly (acrylic acid-co-acrylate ester), poly (vinyl pyrrolidane), cellulose sulphate esters, poly (ethylene oxide), poly (vinyl alcohol), polyamine, poly (vinyl acetate-co-maleic anhydride) and poly (styrene sulphonic acid) and salts thereof.

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