Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1993-06-22
1994-05-17
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521137, 521138, 521139, 521140, 521145, C08J 912
Patent
active
053128460
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.
patent: 4097423 (1978-06-01), Dieterich
patent: 4183822 (1980-01-01), Collington
patent: 4190710 (1980-02-01), Ley et al.
patent: 4304713 (1981-12-01), Perelman
Smits Guido E.
Thoen Johan A.
Foelak Morton
The Dow Chemical Company
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