Technical Data Sheet
Butvar® B-72
Product Description
Butvar® B-72 is a thermoplastic, polyvinyl butyral resin which offers a unique combination of properties for coating or adhesive applications. The use or addition of polyvinyl butyral to a system imparts adhesion, toughness, and flexibility. PVB retains the clarity of the coating and offers reactive hydroxyl sites for crosslinking with thermoset systems.
Typical Properties
Property
Typical Value, Units
General
Hydroxyl Content
b
17.5-20.0
Solution Viscosity
7.5% solids in anhydrous methanol @ 20°C
170-260 cps
Volatile Content
3.5 % max
Form
White, free-flowing powder
Acetate Content
d
2.5 maximum
Butyryl Content
c
80 (approximate)
Molecular Weight
a
170,000-250,000
Specific Gravity
@ 23°/23°C
1.100
Glass Transition Temperature (T
g
)
72-78 °C
a
Size exclusion chromatography with low angle laser light scattering standard.
b
% Polyvinyl Alcohol
c
% Polyvinyl Butyral
d
% Polyvinyl Acetate
Eastman and its marketing affiliates shall not be responsible for the use of this information, or of any product, method, or apparatus mentioned, and you must make your own determination of its suitability and completeness for your own use, for the protection of the environment, and for the health and safety of your employees and purchasers of your products. No warranty is made of the merchantability of fitness of any product, and nothing herein waives any of the Seller's conditions of sale.
2/28/2018 11:35:39 AM