Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1987-01-29
1988-02-02
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...
525507, 528 87, 528 99, 528104, C08G 5906, C08G 5908
Patent
active
047229810
ABSTRACT:
Epoxy resins containing both terminal hydroxyl groups and epoxy or epoxy-derived groups are prepared by advancing a polyepoxide with a polyol and terminating the reaction at a point such that the epoxy resin reaction product contains both epoxy and terminal hydroxyl groups. The controlled conversion resins have improved cure rates. The epoxy groups can be further reacted to form epoxy-derived groups to improve the cure rate even further. The epoxy resins exhibit lower melt and solution viscosities than those exhibited by conventional epoxy resins having the same epoxy equivalent weight, as well as curing quickly when used. The resins are usefully employed at high solids levels in can coating formulations and other epoxy formulations wherein the resin is applied from an organic liquid solution or aqueous dispersion.
REFERENCES:
patent: 2506486 (1950-05-01), Bender et al.
patent: 2615008 (1952-10-01), Greenlee et al.
patent: 3632836 (1972-01-01), Walker
patent: 4568735 (1986-02-01), Li
Elliott Brian W.
Koenig Raymond A.
Nielsen Earl
The Dow Chemical Company
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