Process for the total pre-expansion of polyurethane foam

Details Process for the total pre-expansion of polyurethane foam Process for the total pre-expansion of polyurethane foam

1980-09-30

1982-06-29

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521917, C08G 1814

Patent

active

043373186

ABSTRACT:
The present invention provides a method of utilizing polyurethane foam for insulation purposes in existing walls and other areas without expanding the existing structure. Conventional polyurethane foam post-expands, causing pressures as high as 6 p.s.i., which results in swelling and expanding of existing wall structures. The process of the present invention places the polyurethane foam into its final position in a totally pre-expanded form, making it possible to insulate homes, office buildings, and any other existing structure with foam having a density as low as 0.5 lb. per cu. ft. with no distortion of even the weakest type of structure.

REFERENCES:
patent: 3184419 (1965-05-01), Merriman
patent: 3220801 (1965-11-01), Rill et al.
patent: 3725318 (1973-04-01), Bengtson
patent: 3882052 (1975-05-01), Raynor et al.
patent: 4120923 (1978-10-01), Kloker et al.

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