PVB

PVB Basic information
Product Name:PVB
Synonyms:Polyvinyl butyral film;Poly(vinyl butyral)M.W. 30,000 - 35,000;Poly(vinyl butyral), fine granular powder,nominal M.W. 36,000;Butvar(R) B-98;B-72 Polyvinyl butyral;Butvar®;B-76Polyvinyl butyral;B-98 Polyvinyl butyral
CAS:63148-65-2
MF:C16H28O5
MW:0
EINECS:613-158-6
Product Categories:Adhesive;B;Stains and Dyes;Stains&Dyes, A to;Polymers;bc0001
Mol File:Mol File
PVB Structure
PVB Chemical Properties
Melting point 165-185°C
density 1.08
refractive index 1.485
form Free-Flowing Powder
color White
Water Solubility insoluble
Stability:Stable. Combustible. Dust may form explosive mixture with air. Incompatible with strong oxidizing agents.
CAS DataBase Reference63148-65-2(CAS DataBase Reference)
EPA Substance Registry SystemPolyvinyl butyral (63148-65-2)
Safety Information
Hazard Codes Xi
Risk Statements 36/37/38
Safety Statements 26-36-24/25
WGK Germany 1
RTECS TR4955000
HS Code 39059990
MSDS Information
ProviderLanguage
PVB English
SigmaAldrich English
ACROS English
PVB Usage And Synthesis
Chemical Propertieswhite solid
UsesThe main application of poly(vinyl butyral) is as interlayers in safety glass laminates. In this application, a pure (colourless, light-stable) product with high hydroxyl content (for good adhesion) is required. Such material is preferably prepared from poly(vinyl alcohol) rather than directly from poly(vinyl acetate). In a typical process, completely hydrolysed poly(vinyl alcohol) is suspended in ethanol and then butyraldehyde and a small quantity of sulphuric acid (catalyst) are added. The mixture is heated at 800℃ for 6 hours. Water is then added to the product with rapid agitation and the poly(vinyl butyral) is precipitated as granules, which are washed with alkali and dried.
Poly(vinyl butyral) is generally softer than poly(vinyl formal) with lower softening point, hardness and tensile strength. In commercial polymers the hydroxyl content exerts a major influence on the solubility characteristics. Most grades are soluble in alcohols, glycol ethers and dioxan and as the hydroxyl content decreases the polymers become more soluble in ketones and esters.
Poly(vinyl butyral) used in safety glass generally has 78-80% butyral content, 18-19% hydroxyl content and less than 2% acetate content. For this application the polymer is plasticized with an ester such as dibutyl sebacate to the extent of about 30 parts of plasticizer per 100 parts of polymer; the compound is then sheeted by calendering. To produce safety glass, the sheet is placed between two pieces of glass and the laminate is then bonded under heat and pressure.

PVB Preparation Products And Raw materials
Raw materialsPoly(vinyl alcohol)-->Butyraldehyde
POLYURETHANE Polyoxyethylene stearate NA NA Sodium carboxymethyl cellulose RESIN Curing agent for epoxy resin KAOLIN NA PHENOL-FORMALDEHYDE RESIN PVB acrylate compound type building exterior wall paint polyvinyl butyral exterior wall paint Butyraldehyde Poly(vinyl alcohol) POLY(VINYL BUTYRAL) PVB protocol CZECHTRIM RECYCLED PVB FOIL Polyvinyl butyral sheet

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