THERMOPLASTIC DRESSING MATERIAL
    51.
    发明专利

    公开(公告)号:GB1282056A

    公开(公告)日:1972-07-19

    申请号:GB5879069

    申请日:1969-12-02

    Applicant: HOECHST AG

    Abstract: 1282056 Thermoplastic dressing FARBWERKE HOECHST AG 2 Dec 1969 [2 Dec 1968] 58790/69 Heading B2E [Also in Divisions A5 and B5] A thermoplastic dressing comprises (a) a textile fabric coated on at least one side and/or impregnated with at least one copolymer of trioxane with one or more cyclic formals of the general formula: where the sum of the integers x, y is 0 or 1, the molar ratio of formal:trioxan being 0.7- 2.8:1 and the melting point range of the copolymer being from 40‹-80‹C and (b) at least one separating film or sheet of paper coated with a silicone resin on one or both sides. The copolymer may be applied to the textile by extrusion to a thickness of 1-5 mm or by impregnating individual fibres before making the textile. Suitable copolymers have a reduced specific viscosity of 0.3-1.5 Al/g (measured at 140‹C in butyro lactone at 0.5g/100 ml). The textile may comprise 1-5% weight of the coated fabric and may weigh 10-100 g/m 2 . Synthetic or natural fibres e.g. cotton, wool, cellulose acetate, polyesters, polyacrylonitrile may be used in the textiles. The release paper may suitably comprise a coating of poly (dimethylsiloxane) in an amount 1-20% wt. of paper. The dressing is applied in a heat softened state and then allowed to solidify.

    57.
    发明专利
    未知

    公开(公告)号:BR7702897A

    公开(公告)日:1977-11-29

    申请号:BR7702897

    申请日:1977-05-05

    Applicant: HOECHST AG

    Inventor: SEXTRO G BURG K

    Abstract: of the disclosure: Granular oxymethlene polymers are prepared by cooling a solution or dispersion of an oxymethylene polymer, the temperature of the said solution of dispersion polymer, to a temperature just below the said sintering temperature. As dissolving or dispersing agent there is used a mixture of methanol and water. The cooling of the said solution of dispersion is effected in two stages while using a liquid cooling agent or a cooling device. After precipitation the coarse-granular polymer is separated from the fine-granular portion. It is suitable as engineering plastic for preparing molded articles.

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