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    • 69. 发明公开
    • POLYVINYL ALCOHOL COMPOSITION AND FILM
    • 聚乙烯醇和电影
    • EP1560875A1
    • 2005-08-10
    • EP03773868.9
    • 2003-11-14
    • Polyval PLC
    • TAYLOR, Paul AnthonyGONINAN, Kevin MarkSIMPKINS, Thomas VivianWILLIAMS, Michael ThomasSODEN, Anthony Cyril
    • C08J5/18C08J3/18C08K5/00
    • C08J3/18C08J5/18C08J2329/04C08J2329/14C08K5/053C08L29/04
    • A method of preparing a plasticised particulate polyvinyl alcohol (PVA) composition is provided, comprising: mixing, in a mixer, at a mixer speed and for a time sufficient that the mixture attains a temperature of at least 50°C: particulate PVA resin in an amount from 80% to 90% by weight of the mixture; and plasticiser in an amount from 10% to 20% by weight of the mixture, wherein at least a portion of the plasticiser is water; monitoring the apparent viscosity of the mixture during mixing and continuing mixing until the apparent viscosity of the mixture has peaked to a maximum and dropped off to a substantially constant level, thereby to obtain a plasticised particulate mixture having a moisture content in the range from 7% to 14%; preferably adding an anti-caking agent in an amount from 0.05% to 0.5% by weight of the plasticised particulate mixture, and continuing mixing until the anti-caking agent is blended to the plasticised particulate mixture; and stopping mixing, and removing the mixture from the mixer, wherein the mixture temperature is kept below 100°C at all times during mixing. The properties of the plasticised particulate composition are such that it can be processed, by extrusion and blowing, to a film having advantageous characteristics in terms of structure and properties. Accordingly, also provided is a PVA film characterised in that, when viewed using polarising light microscopy, it has a nonuniform texture consisting of distinct short range areas, e.g. 10 to 500 micrometers, each short range area showing anisotropic orientation within its area, each short range area being oriented isotropically.
    • 70. 发明公开
    • BIMODALE POLY(METH) ACRYLATPLASTISOLE UND VERFAHREN ZU IHRER HERSTELLUNG
    • BI MODAL聚(甲基)丙烯酸酯塑料溶胶及其制备方法
    • EP1192220A1
    • 2002-04-03
    • EP00945783.9
    • 2000-06-20
    • Röhm GmbH & Co. KG
    • LÖHDEN, GerdTRÄBING, Mauren
    • C08L33/12C08J3/18
    • C08J3/18C08J2333/12C08K5/0016C09D133/12C08L33/12C08L2666/28C08L2666/54
    • The invention relates to a plastisol comprising the following in a mixture: I) one or more polymers and/or copolymers of (meth)acrylates obtained by polymerisation of compounds containing the following polymerisable constituents: A) 20 to 100 wt. % methylmethacrylate, B) 0 to 80 wt. % of a (meth)acrylate of formula (I) that is different from methylmethacrylate, R1 representing hydrogen or methyl and R2 representing a linear or branched alkyl radical with 1 to 18 carbon atoms, C) 0 to 40 wt. % of a vinylically unsaturated monomer that is different from A) and B), and D) 0 to 40 wt. % of an adhesion-promoting monomer, A) to D) totalling 100 wt. % of the polymerisable constituent; II) plasticizers that are compatible with the polymers and/or copolymers from I) in quantities of 5 to 400 parts by weight for 100 parts by weight of said polymers and/or copolymers; III) inorganic fillers in quantities of 0 to 700 parts by weight for 100 parts by weight of the components from I). The inventive plastisol is characterized in that the polymers and/or copolymers of the (meth)acrylates are a) emulsion polymers with b) a bi- or multimodal size distribution of the primary particles. In addition to improvements in term of the mechanics of the resulting films, the inventive plastisols themselves have improved resistance to storage and an excellent compatibility with economical plasticizers. The plastisols also permit a relatively high binder content.