Monsanto Company

Robert H Simon

Peter H Farmer

Dean L Kavanagh

George E Cartier

Carl P Piretti

Peter D LaPorte

A plastic sheet, preferably of plasticized partial polyvinyl butyral, for a laminated safety glazing, having means dispersed on its surface, preferably comprising a multiplicity of spaced projections, capable of resisting adhesion to a rigid panel, such as glass, of such a glazing when the sheet is laminated to the panel, the area of the sheet surface without such dispersed means having high affinity for adhesion. The projections physically block adhesion of a dispersed area of the sheet to the panel in that the means on the sheet surface have no or weak interfacial adhesion. The multiplicity of space projections also have low or no affinity for adhesion when in blocking contact with each other or with another plasticized partial polyvinyl butyral surface and thereby increase blocking resistance.

Block-resistant partial polyvinyl butyval

A process for forming a shaped laminate for use in a safety glazing such as a vehicle window or the like which comprises lightly bonding at least one flexible, transparent, thermoplastic carrier layer having one or more adherent functional performance layers or coatings on its surface to at least one layer of ptasticized polyvinyl butyral to form a premolding composite, stretching the composite to impart compound curvature thereto and form a shaped, shrinkable laminate, subjecting the shaped laminate to elevated temperature while constraining its edges to relieve stresses in the carrier layer, and cooling the shaped laminate while maintaining its edges constrained.

Process forming a shaped laminate

Plastic sheet for a laminated glazing and method for controlling

A process for deairing an interface region by applying on the surface of a plastic sheet a multitude of spaced plastic projections formed of a plastic material different from that of the sheet, assembling the sheet with the spaced projections in face to face contact with at least one rigid panel such as glass, and evacuating air from the interface region between the rigid panel and the plastic sheet through spaces between the projections.

Process for deairing an interface region

Method of producing polyvinyl butyral sheet having a desired level of

A laminated glazing unit having improved impact strength comprising a), b) and c) in sequence: a) a glass layer; b) a plasticized layer containing partial polyvinyl butyral; c) another glass layer; and d) means, preferably a multiplicity of spaced projections, dispersed on the surface of at least one of the foregoing layers, preferably the plasticized layer, capable of resisting adhesion to the layer with which it is in contact, the area without said dispersed means (e.g. between projections) of the layer having such dispersed means having high affinity for adhesion to the layer with which it is in contact, such laminated glazing at a specific pummel adhesion having a greater mean break height than that of a laminated glazing containing layers a) b) and c) but without d). The dispersed means may be on the surface of a glass layer but is preferably on the plasticized layer.

Laminated glazing with improved impact strength

A wrinkle-free bilayer glazing panel comprising sequentially: a) a sheet of glass; b) a layer of plasticized partial polyvinyl butyral; c) a transparent polyester layer; and d) a layer of cross-linked, self-healing polyurethane.

Bilayer glazing panel

A method of forming a bilayer glazing panel by providing an optically clear prelaminate of stretched polyester film coated with a cross-linked, self-healing polyurethane layer; assembling the prelaminate with a layer of plasticized partial polyvinyl butyral with the side of the polyester film without the polyurethane layer in facing contact with a subjacent textured surface of the partial polyvinyl butyral layer; clamping the assembled layers in a perimeter anchoring system; sequentially carrying out the following steps i), ii), iii), and optionally the above clamping step within an air autoclave; i) deairing the interface between the polyester film and plasticized partial polyvinyl butyral; ii) forcing localized regions of the layers within the perimeter anchoring system against a sheet of glass; and iii) subjecting the assembly of step ii) to elevated temperature and pressure while the plastic layers remain clamped within the perimeter anchoring system to firmly bond the plastic layers and glass sheet together.

Method of forming a bilayer glazing panel

A method of dimensionally stabilizing a transparent, shrinkable thermoplastic layer, such as polyethylene terephthalate, in a draw-formed laminate with plasticized polyvinyl butyral which comprises heat setting the thermoplastic layer.

Dimensional stabilizing process

A flexible, draw-formed laminate for a safety glazing comprising a transparent, thermoplastic carrier film which is shrink-stable during laminating formation of such safety glazing bonded to at least one layer of plasticized polyvinyl butyral, such film having a greater tensile modulus than that of the layer of plasticized polyvinyl butyral. The carrier film is preferably flexible polyester such as polyethylene terephthalate having one or more functional performance coatings or layers on its surface such as a multi-layered solar radiation control stack.

Laminate for a safety glazing

The invention relates to a process for preparing ABS polyblends having small and large grafted rubber particles dispersed therein providing polyblends having greater toughness and chemical resistance. The process includes extracting small grafted rubber particles into a separated monomer phase which is mass polymerized to a first melt, mixing said first melt with a second melt having present larger grafted rubber particles to form a third melt which is devolatilized to an ABS polyblend having a bimodal grafted rubber particle size distribution.

Process for preparing ABS polymeric polyblends

The process relates to a continuous mass polymerization process for ABS polyblends wherein a monomer formulation of monoalkenyl aromatic and alkenyl nitrile monomers having a conjugated diene rubber dissolved therein is continuously charged to a first, stirred reaction zone operating at a steady conversion of said monomers of about 5 to 45% forming a partially polymerized first mixture having said rubber dispersed as grafted rubber particles, followed by continuously polymerizing said first mixture in a second stirred reaction zone by substantial linear flow polymerization under evaporative cooling of said monomers to a second partially polymerized mixture containing about 50 to 90% of ABS polyblend solids and separating said solids from said second mixture as an ABS polyblend.

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Longmeadow, MA, United States of America

Robert H Simon