Process for preparing silicone modified polyester resins and a p

Details Process for preparing silicone modified polyester resins and a p Process for preparing silicone modified polyester resins and a p

1990-12-12

1993-07-13

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...

528 25, 528 26, 528 29, 528 37, C08F 2020

Patent

active

052274357

ABSTRACT:
A process for preparing polyester resins for powder coatings by using monomers having a low glass transition temperature and silicone compounds comprises (1) condensation reacting silicone compounds with alcohols having at least two hydroxyl groups, (2) reacting resins prepared by the step (1) with acidic compounds in the presence of esterification catalysts, and (3) reacting resins prepared by step (2) with trimellitic anhydride in the presence of catalysts to form polyester resins having an acid value of 30 to 100, a low melting viscosity, a low softening point, excellent storage stability, good heat-resistance and a good appearance.

REFERENCES:
patent: 4107148 (1978-08-01), Fujiyoshi et al.
patent: 4608421 (1986-08-01), Lin
patent: 4764569 (1988-08-01), Umemolo et al.
J. Smarsh, J. Paint Technology, 44 (No. 565), Feb. 1972.
Lee and Neville, Handbook of Epoxy Resins (1967), p. 15-13.
Noll, Chem. & Tech. of Silicones (1968) p. 3.

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