Monsanto Company

Arijit M DasGupta

Donald J David

Ashok Misra

Roland J Tetreault

Sheet for safety glazings made of: a) polyvinyl butyral internally plasticized by the presence in the polymer of C.sub.7 to C.sub.15 aliphatic aldehyde groups and b) an external plasticizer in amount sufficient to provide a sheet glass transition temperature of about 25.degree. to 30.degree. C.

Polyvinyl butyral sheet

Polyvinyl butyral resin containing a modification-promoting amount of up to about 15 mole % ionomeric groups which are preferably the metal sulfonate salt of an aldehyde chemically combined with oxygen atoms of adjacent precursor vinyl alcohol groups. Such resin is prepared from a precursor PVOH containing chemically bound ionic acid groups.

Ionomeric 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.

A process for increasing both resistance to blocking and flow during laminating of plasticized polyvinyl butyral sheet which comprises incorporating into the formulation of the sheet a block-reducing and flow-promoting amount, preferably up to about 10 mole %, of ionomeric groups chemically bound to oxygen atoms of adjacent precursor vinyl alcohol groups.

Reducing blocking and increasing flow of plasticized polyvinyl butyral

A method of producing ionomeric polyvinyl butyral by the steps of (a) condensing polyvinyl alcohol with an aldehyde containing an acid group in the presence of a catalyst; (b) acetalizing the reaction product of step (a) in situ with butyraldehyde to form polyvinyl butyral and (c) neutralizing the reaction product of step (b) to form ionomeric polyvinyl butyral.

Method of producing ionomeric polyvinyl butyral

A polyblend comprising first and second polyvinyl butyral components admixed with plasticizer, one of the components present in minor amount (preferably 10 to 30 weight %) containing chemically bound ionomeric groups which are preferably the metal salt of an aldehyde.

Polyvinyl butyral polyblend

In a process for preparation of polyvinyl butyral sheet by blending polyvinyl butyral with plasticizer and extruding the blend to form the sheet, the step in combination therewith of including in the blend a modification-promoting amount, preferably up to about 10 mole % based on polyvinyl butyral, of ionomeric groups chemically bound to polyvinyl butyral forming the sheet.

Growing community of inventors

Holyoke, MA, United States of America

Arijit M DasGupta