Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1987-11-03
1990-11-13
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524297, 524314, 525 61, C08K 509
Patent
active
049702530
ABSTRACT:
Thermoplastic plasticized polyvinylbutyral molding compositions, in particular films of improved tensile strength and reduced tackiness are prepared by acetalization of polyvinyl alcohol, capable of association, in the associated state with n-butyraldehyde in aqueous phase in the presence of an acid catalyst and, if appropriate, of an organic sulfonic acid having an emulsifying action, after-treatment of the polyvinylbutyral under acetalization conditions at an elevated temperature in the presence of an organic sulfonic acid having 8 to 30 C atoms and having an emulsifying action, isolation and/or purification of the polyvinylbutyral and, if appropriate, admixture of conventional additives and mixing of the product, which may have been dried, with up to 40% by weight of plasticizer, relative to the polymer/plasticizer mixture, and molding, the plasticizers employed being esters of phthalic acid with C.sub.6 -C.sub.10 -alcohols and/or esters of adipic acid with C.sub.6 -C.sub.10 -alcohols.
Use of the films for the manufacture of laminated glass, and laminated glass containing the films as the joining layer.
REFERENCES:
patent: 3153009 (1964-10-01), Rombach
patent: 3926918 (1975-12-01), Shibata et al.
patent: 4205146 (1980-05-01), Hermann
patent: 4452935 (1984-06-01), Nomura et al.
"Production and Properties of Aqueous Polyvinyl Alcohol Solutions"; Harreus et al.; pp. 24-30; Sep. 1983.
Fabian Klaus
Fock Kurt
Hermann Hans Dieter
Hoechst Aktiengesellschaft
Reddick J. M.
Schofer Joseph L.
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