Cellular polymer containing perforated cell windows and a proces

Details Cellular polymer containing perforated cell windows and a proces Cellular polymer containing perforated cell windows and a proces

1992-09-28

1993-10-05

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521132, 521134, 521136, 521137, 521138, 521908, C08J 940

Patent

active

052505790

ABSTRACT:
A process for preparing a cellular polymer containing perforated cell windows in the presence of a perforating agent being a substance that has a critical surface free energy of less than about 23 mJ/m.sup.2 is disclosed. The cellular polymers obtained according to this invention have a fine cell structure and show enhanced dimensional and thermal insulation stability. The invention also relates to rigid polyurethane foam prepared in the presence of, for example, particulate poly(tetrafluoroethylene) or a liquid polyfluoro- or perfluorocarbon, with a boiling point of at least 130.degree. C., as perforating agent.

REFERENCES:
patent: 3753933 (1973-08-01), Olstowski et al.

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