Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1986-10-14
1989-07-11
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525934, C08G 5916
Patent
active
048473375
ABSTRACT:
Advanced epoxy resin and polyester blends suitable for use in powder coatings are prepared by (I) polymerizing, in the presence of a suitable catalyst such as tertiary butyl perbenzoate, (A) the reaction product of (1) a diglycidyl ether of a dihydric phenol such as the diglycidyl ether of bisphenol A and with (2) a compound containing a group reactive with an epoxide group and a polymerizable ethylenically unsaturated group such as methacrylic acid; with (B) a monomer feed containing (1) at least one vinyl aromatic monomer such as styrene; (2) a compound containing a group reactive with an epoxide group and a polymerizable ethylenically unsaturated group such as methacrylic acid; and optionally (3) a hydroxyalkyl acrylate or methacrylate or an alkyl acrylate or methacrylate such as hydroxyethylacrylate; and (II) advancing, in the presence of a suitable advancement catalyst such as ethyltriphenylphosphonium acetate acetic acid complex, the resultant polymerized product with (C) a dihydric phenol such as bisphenol A and (III) combining the resulting advanced epoxy resin from step (II) with (D) an acid and/or hydroxyl functional polyester in an amount sufficient to provide a mole ratio of epoxide groups to acid and/or hydroxyl groups of from about 0.9 to 1 to about 1.1 to 1.
REFERENCES:
patent: 29014 (1976-10-01), Pizzini et al.
patent: 4161468 (1979-07-01), Davis et al.
patent: 4308185 (1981-12-01), Evans et al.
patent: 4399241 (1983-08-01), Ting et al.
patent: 4482671 (1984-11-01), Woo et al.
Bleutge John C.
Sellers II Robert E. L.
The Dow Chemical Company
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