Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1984-07-20
1985-06-11
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
528 59, 528 60, 528 65, C08G 1810
Patent
active
045229864
ABSTRACT:
Urethane-urea flow control agents are synthesized by a two-step process. First, an isocyanate-terminated urethane prepolymer is prepared by reacting a polyether polyol with a stoichiometric excess of a saturated cyclic aliphatic polyisocyanate. These isocyanate-terminated prepolymers are then modified by reaction with an ethanolamine to form urea endcapped flow control agents having number average molecular weight of between 1000 and 4000. These urea endcapped flow control agents can be blended with any urethane paint system and be compatible in structure. They have shown specifically superior compatibility with melamine cured high solids urethane paint systems. When blended with pigmented urethane paint at relatively small amounts, these flow control agents greatly reduce sagging while maintaining excellent leveling and viscosity properties of the paint.
REFERENCES:
patent: 3893956 (1975-07-01), Brandt
patent: 3935051 (1976-01-01), Bender et al.
patent: 4029626 (1977-06-01), Gillemot et al.
patent: 4311622 (1982-01-01), Buter
patent: 4383068 (1983-05-01), Brandt
patent: 4387194 (1983-06-01), Ottaviani et al.
Ottaviani Robert A.
Short William T.
General Motors Corporation
Tung Randy W.
Welsh Maurice J.
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