An interlayer for laminated glasses which does not cause the moire phenomenon even when having an embossed pattern with grooves and ridges disposed regularly or arranged at a regular interval, hence has satisfactory workability in cutting or laminating, and is highly effective in expelling air in preliminary press bonding; and a high-quality laminated glass produced with the same which is almost free from quality defects caused by residual bubbles. The interlayer is highly effective in air expelling even without strictly controlling the air expelling initiation temperature in the preliminary press bonding, is excellent in nonblocking properties during storage, handleability during glass processing, and productivity, and can be easily and efficiently used under various processing conditions. It comprises a thermoplastic resin sheet having on each side thereof an embossed pattern comprising grooves and ridges.

Interlayer for laminated glass, and laminated glass

An interlayer film for laminated glass comprising laminated layers of at least one layer (A) which comprises a plasticizer and polyvinyl acetal resin for which the number of carbon atoms in the acetal group is 4, 5 or 6 and the mole ratio of the average amount of the ethylene groups bonded to acetyl groups is 8-30 mole % of the total amount of the main chain ethylene groups, and at least one layer (B) which comprises a plasticizer and polyvinyl acetal resin for which the number of carbon atoms in the acetal group is 3 or 4 and the mole ratio of the amount of the average ethylene groups bonded to acetyl groups is 4 mole % or less of the total amount of the main chain ethylene groups.

Interlayer film for a laminated glass

An interlayer for use in sound-insulating laminated glasses which is in the form of a laminated film of two kinds of resin films (A) and (B), each comprising a polyvinyl acetal acetalized with an aldehyde having 6 to 10 carbon atoms for the film (A) or with an aldehyde having 1 to 4 carbon atoms for the film (B), or is in the form of a resin film (C) comprising a mixture of the two kinds of polyvinyl acetal resins. The interlayer mitigates the coincidence effect to prevent the reduction of TL value without impairing the basic characteristics required of laminated glasses thereby permitting the interlayer to exhibit outstanding sound-insulating properties over a wide temperature range for a prolonged period of time.

Interlayers for use in sound-insulating laminated glasses

Polyvinyl butyral (PVB) resin lightly cross-linked through stable intermolecular linkages developed, for example, through use of a dialdehyde or trialdehyde, to selectively increase PVB molecular weight and the modulus of a plasticized sheet formed therefrom intended for use in laminated safety glass assemblies.

Cross-linked polyvinyl butyral

Plasticized polyvinyl butyral sheet containing a modification-producing amount of ionomeric groups which are preferably the metal sulfonate salt of an aldehyde chemically combined with oxygen atoms of adjacent precursor vinyl alcohol groups.

Polyvinyl butyral sheet

Mixtures of two distinct polyvinyl butyral grades, viz., one high viscosity and one low viscosity grade, both having a narrow molecular weight distribution exhibit good processing characteristics which nearly reach the performance of the high viscosity grades hitherto used.

Polyvinyl butyral polymer mixture for making intermediate sheeting for laminated glass

The preparation of polyvinylbutyral is commonly effected by the acetalization of polyvinyl alcohol with n-butyraldehyde, either in an organic solvent or in water. By varying the reaction conditions it is possible to obtain the polyvinylbutyral in a coarse-grain or fine-grained form. The production of polyvinylbutyral having improved properties is possible by using a polyvinylbutyral having a content of from 17 to 24% by weight of vinyl alcohol units as starting material for an after-treatment in the presence of an organic sulfonic acid having an emulsifying effect. The polyvinylbutyral obtained is particularly suitable for the manufacture of compound sheets.

Process for the preparation of polyvinylbutyral having improved properties

Die Herstellung von Polyvinylbutyral erfolgt ublicherweise durch Acetalisierung von Polyvinylalkohol mit n-Butyraidehyd, und zwar entweder in einem organischen LosemitteL oder auch in Wasser. The preparation of polyvinyl butyral is usually carried out by acetalization of polyvinyl alcohol with n-Butyraidehyd, either in an organic solvent or in water. Durch Variation der Reaktionsbedingungen kann erreicht werden, das Polyvinylbutyral grobkomig oder feinteilig anfallt Die Gewinnung von Polyvinylbutyral mit verbesserten Eigenschaften ist moglich durch Verwendung von Polyvinylbutyral mit einem Gehalt von 17 bis 24 Gewichtsprozent Vinylalkoholeinheiten als Ausgangsmaterial fur eine Nachbehandlung in Gegenwart einer emulgierend wirkenden organischen Sulfonsaure. By varying the reaction conditions can be achieved in that polyvinyl butyral grobkomig or finely obtained the recovery of polyvinyl butyral having improved properties is possible through the use of polyvinyl butyral with a content of 17 to 24 weight percent of vinyl alcohol units as the starting material for a treatment in the presence of an emulsifying organic sulfonic acid. Das erhaltene Polyvinylbutyral eigpet sich insbesondere zur Herstellung von Verbundfolien. The polyvinyl butyral obtained eigpet in particular for the production of composite films.

Process for preparing polyvinyl butyral with improved properties.

Polymerisatgemisch zum herstellen von zwischenfolien fuer verbundglaeser

Die Herstellung von Polyvinylbutyral erfolgt ublicherweise durch Acetalisierung von Polyvinylalkohol mit n-Butyraidehyd, und zwar entweder in einem organischen LosemitteL oder auch in Wasser. Durch Variation der Reaktionsbedingungen kann erreicht werden, das Polyvinylbutyral grobkomig oder feinteilig anfallt Die Gewinnung von Polyvinylbutyral mit verbesserten Eigenschaften ist moglich durch Verwendung von Polyvinylbutyral mit einem Gehalt von 17 bis 24 Gewichtsprozent Vinylalkoholeinheiten als Ausgangsmaterial fur eine Nachbehandlung in Gegenwart einer emulgierend wirkenden organischen Sulfonsaure. Das erhaltene Polyvinylbutyral eigpet sich insbesondere zur Herstellung von Verbundfolien.

Ebigt J

Papers

Polyvinyl butyral polymer mixture for making intermediate sheeting for laminated glass

Process for the preparation of polyvinylbutyral having improved properties

Process for preparing polyvinyl butyral with improved properties.

Polymerisatgemisch zum herstellen von zwischenfolien fuer verbundglaeser

Verfahren zur Herstellung von Polyvinylbutyral mit verbesserten Eigenschaften.