Hydroquinone and its derivatives...
...effective polymerization inhibitors for unsaturated polyester systems We direct your attention here to Eastman's hydroquinone and derivatives. Several of them are
structures are absent from the inhibitors, they add
currently being used with success in a number of
Because no suggestions for use of particular inhibitors can be made without a study of specific cases, you may want to evaluate one or more of these inhibitors in your own system. Samples and additional information can be yours if you write Chemicals Division, EASTMAN CHEMICAL PRODUCTS, INC., a subsidiary of EASTMAN KODAK COMPANY,
different polymer systems, including unsaturated polyester resins. As the accompanying table indicates, they provide good stability during blending and adequate shelf life, yet their inhibitory effect is easily overcome in most cases by use of proper amounts of free radical initiators. When conjugated quinoid
little or no color to the system.
KINGSPORT, TENNESSEE.
INHIBITOR PROPERTIES IN A COMMERCIAL POLYESTER1
iiwiwi tllws
Gelation Time2 237°F.
SPIGelTime* 78°F. Minutes
i Composition: 60% polyester resin (hi isophthalic acid-maleic anhydride with propylene glycol) + 40% styrene 3 1 % benzoyl peroxide * 1 % MEK peroxide, 0.036% cobalt naphthenate
2 No catalyst
Eastman CHEMICAL PRODUCTS, INC. CHEMICALS DIVISION, KINGSPORT, TENN. S u b s i d i a r y of Eastman Kodak Company
C&EN
99
