Stuttgart, Germany
Stuttgart, Germany

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The invention is directed to a process for extrusion of mixtures comprising at least one polyvinyl acetal, at least one plasticiser and least one earth alkaline salt of a carboxylic acid, characterised in that 0.001% - 1 wght% (based on the combined weight of PVB resin and plasticizer) of at least one organic acid having 4 to 30 carbon atoms is added to the mixture.


Patent
Kuraray Co. and Kuraray Europe GmbH | Date: 2017-02-15

Provided is a dispersion stabilizer for suspension polymerization comprising an aqueous emulsion containing a dispersant (A), a dispersoid (B), a graft polymer (C), and an aqueous medium, wherein the dispersant (A) contains a surfactant, the dispersoid (B) contains a polymer having an ethylenically unsaturated monomer unit, the graft polymer (C) is obtained by graft polymerization of the ethylenically unsaturated monomer with the dispersant (A), a mass ratio [A/(A + B + C)] is 0.001 or more and less than 0.18, a mass ratio [C/(A + B + C)] is 0 or more and less than 0.04, and the total content of the dispersant (A), the dispersoid (B), and the graft polymer (C) is 35 to 70 mass%. A vinyl polymer to be obtained by suspension polymerization of a vinyl compound using the dispersion stabilizer has good plasticizer absorption. Further, the number of fish-eyes that occur when the vinyl polymer is formed is small, and the hue deterioration is also suppressed. Further, the dispersion stabilizer also has excellent handleability.


Patent
Kuraray Co. and Kuraray Europe GmbH | Date: 2017-02-15

A dispersion stabilizer in the present invention contains an aqueous emulsion (a) obtained by dispersing a polymer (A) having an ethylenically unsaturated monomer unit in an aqueous medium, a PVA (B) having a degree of saponification of 65 mol% or more and less than 82 mol% and a viscosity-average degree of polymerization of 250 or more and less than 1500, and a PVA (C) having a degree of saponification of 82 mol% or more and less than 98 mol% and a viscosity-average degree of polymerization of 1500 or more and less than 4000. The dispersion stabilizer contains: 7 to 51 mass% of the polymer (A); 40 to 84 mass% of the PVA (B); and 9 to 53 mass% of the PVA (C), with respect to a total amount of the polymer (A), the PVA (B), and the PVA (C). A vinyl resin satisfying required performance can be obtained using the dispersion stabilizer.


The invention is directed to a process for embossing a film comprising plasticized polyvinyl acetal with a roughness Rz on at least one surfaces of 20 to 100 m by the process steps of a. extrusion of plasticised polyvinyl acetal to a film with a stochastic roughness of the surfaces of Rz = 1 to 70 m, b. embossing of at least one surface of the film obtained in step a) with channels having a depth of 5 - 50 m, a width of 10 - 200 m and a pitch of 50 - 2500 m, wherein c. the surface roughness of the elevations between the channels is at most 20% lower as obtained in step a).


A heat-shielding laminated glass laminate contains at least one film A containing a polyvinyl acetal PA and optionally at least one plasticiser WA, and at least one film B containing a polyvinyl acetal PB and at least one plasticiser WB, positioned between two glass sheets, wherein prior to lamination:


Layered structures consisting of at least one film A containing a polyvinyl acetal PA and at most 16% by weight of plasticiser WA and at least one film B containing a polyvinyl acetal PB and at least 16% by weight plasticiser WB between two glass sheets, are produced by adhering at least one film A to at least one film B or at least one of the glass sheets by means of a liquid. The layered structure can then be pressed to form a composite glass laminate.


The invention is directed to Laminated glass obtained by laminating at least one film A containing a polyvinyl acetal PA and optionally at least one plasticiser WA and at least one film B containing a polyvinyl acetal PB and at least one plasticiser WB between two glass sheets, characterised in that prior to lamination- the amount of plasticiser WA in film A is less than 16 % by weight- the amount of plasticiser WB in film B is at least 16 % by weight and- film A comprises at least 7 ppm alkali ions.


The invention relates to an photochromic interlayer film for laminated glass composed of at least two individual films based on plasticizer-containing polyvinyl acetal, characterized in that said individual films comprise at least one photochromic compound and have a glass transition temperature which differs at least by 5 K.


The invention relates to an photochromic interlayer film for laminated glass composed of at least two individual films based on plasticizer-containing polyvinyl acetal, characterized in that said individual films comprise at least one photochromic compound and have a glass transition temperature which differs at least by 5 K.


Penetration resistant laminated glass is obtained by laminating at least one film A containing a polyvinyl acetal PA and optionally at least one plasticiser WA and at least one film B containing a polyvinyl acetal PB and at least one plasticiser WB between two glass sheets, where prior to lamination, the amount of plasticiser WA in film A is less than 16% by weight, the amount of plasticiser WB in film B is at least 16% by weight, and film A comprises at least 7 ppm alkali ions.

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