POLY(2-PROPYL-m-DIOXANE-4,6-DIYLENE) Structural Formula.
[~yCHCH2CHCH2~]n | | 0-CH-0 | CH2CH2CH3
CAS No 63148-65-2
RTECS No TR4955000
Abbreviation. PVB.
Synonyms and Trade Name. Butvar; Polyvinyl butyral resin.
Composition. VL-023 phosphating primer has been prepared on the base of PVB and iditol resin. Pigment: zinc chromate.
Properties. Amorphous white polymer. Dens. 1.120; n20 = 1.485. Soluble in alcohol.
Applications. Used in the preparation of anticorrosion coatings.
Migration Data. Water in contact with VL-023 phosphating primer was colored and had a specific odor. Phenol (up to 2.9 mg/I) and chromium (up to 2.6 mg/l) were found to migrate into water. Other substances found in the contact water were butanol, formaldehyde, and zinc.
Regulations. U.S. FDA (1998) approved the use of PVB (1) in adhesives as a component (monomer) of articles intended for use in packaging, transporting, or holding food in accordance with the conditions prescribed in 21 CFR part 175.105; (2) as a component of the uncoated or coated food-contact surface of paper and paperboard intended for use in producing, manufacturing, packaging, processing, preparing, treating, packing, transporting, or holding aqueous and fatty foods in accordance with the conditions prescribed in 21 CFR part 176.170; and (3) in the manufacture of resinous and polymeric coatings for the food-contact surface of articles intended for use in producing, manufacturing, packing, processing, preparing, treating, packaging, transporting, or holding food for use only as polymerization cross-linking agent in side seam cements for containers intended for use in contact with food (only of the identified types), subject to the conditions prescribed in 21 CFR part 175.300.
EU (1990). PVB is available in the List of authorized monomers and other starting substances which may continue to be used for the manufacture of plastic materials and articles intended to come into contact with foodstuffs pending a decision on inclusion in Section A (Section B).
Reference:
Rudeiko, V. A., Pashkina, E. H., Romashov, P. G., and Yakovleva, L. E., Hygienic evaluation of conditions for using a phosphating primer in the water supply, Gig. Sanit., 6, 16, 1980 (in Russian).
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