Method for protecting a substrate with a multi-density composite

Details Method for protecting a substrate with a multi-density composite Method for protecting a substrate with a multi-density composite

1982-02-01

1985-03-26

Lawrence, Evan K.

Coating processes

Foraminous product produced

Filter, sponge, or foam

427373, 427426, B05D 500, B05D 102, B05D 134

Patent

active

045073368

ABSTRACT:
A substrate, such as a roofing substrate, is protected by coating it with a low density polyurethane foam which is then coated with an essentially non-porous, dense, elastomeric polyurethane layer. The layer is formed by spraying a volatile-free spray of polyurethane precursor reactants onto the surface of the foam and rapidly reacting the precursors.

REFERENCES:
patent: 3493257 (1970-02-01), Fitzgerald et al.
patent: 3649324 (1972-03-01), Payne
patent: 3873407 (1975-03-01), Kumata et al.
patent: 3967028 (1976-06-01), Muller et al.

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