Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1987-05-29
1988-08-30
Nielsen, Earl
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525529, 525524, 525934, 528 94, 528104, C08G 5962, C08G 5968, C08G 8100
Patent
active
047678321
ABSTRACT:
A phenolic curing agent for epoxy resin powder coatings is prepared by combining (a) a linear phenolic hydroxyl-terminated resin having a weight per phenolic within the range of about 650 to about 8,000, preferably about 850 to about 950, (b) a dihydric phenol present in an amount such that the weight per hydroxyl of the mixture of (a) and (b) is within the range of about 240 to about 280, and (c) at least about 2 weight percent, based on the weight of the composition, of an imidazole cure accelerator. The described imidazole-accelerated curing agent is less susceptible to melting point depression and to sintering with storage than conventional imidazole-containing phenolic curing agents. The dihydric phenol-terminated epoxy resin is preferably prepared by reacting a dihydric phenol with a linear diepoxy resin in the presence of a phosphonium halide catalyst so as to produce a phenolic hydroxyl-terminated resin having a weight per hydroxyl within the range of about 650 to about 8,000.
REFERENCES:
patent: 3978027 (1976-08-01), Marshall
patent: 4009223 (1977-02-01), Noonan
patent: 4066625 (1978-01-01), Bolger
patent: 4075260 (1978-02-01), Tsen et al.
patent: 4186036 (1980-01-01), Elms et al.
patent: 4251426 (1981-02-01), McClure et al.
Nielsen Earl
Shell Oil Company
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