High punchability heat resistant coating for sheet metal

Details High punchability heat resistant coating for sheet metal High punchability heat resistant coating for sheet metal

1984-11-29

1985-11-19

Griffin, Ronald W.

Stock material or miscellaneous articles

Composite

Of epoxy ether

428461, 428463, 428469, 523402, 523426, 523451, 524127, 524417, 528101, B32B 1508, B32B 2742, C08K 505, C08L 6300

Patent

active

045542139

ABSTRACT:
Sheet steel used for making the cores of electrical machines is improved as to its punchability by coating it with a heat resistant coating of a complex mixture of phosphates and resins compatible with acid phosphate ions. The coating contains between 60 and 95% by weight of the phosphates and between 5 and 40% by weight of the resins. The resins can be acrylic base resins, ethylene-vinyl acetate copolymer resins, or thermosetting epoxy resins.

REFERENCES:
patent: 2060572 (1936-11-01), Heck
patent: 2541027 (1951-02-01), Bradley
patent: 2732367 (1956-01-01), Shokal
patent: 3890265 (1975-06-01), Corrigan
patent: 4160756 (1979-07-01), Nishida et al.
patent: 4195003 (1980-03-01), Hurlock et al.
patent: 4219607 (1980-08-01), Cammack et al.
patent: 4397970 (1983-08-01), Campbell et al.
patent: 4427745 (1984-01-01), Pearson
patent: 4430367 (1984-02-01), Lat

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