Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1976-03-04
1978-09-19
Rzucidlo, Eugene C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521133, 521917, 366101, 422128, 422133, C08J 906
Patent
active
041152999
ABSTRACT:
The invention relates to a frothing method for mixing a liquid propellant having a low boiling point with further components for the production of foamed material, more particularly polyurethane. The invention also relates to an apparatus for carrying out the method with a mixing head for high pressure mixing of the main components in a mixing chamber. The foam production is carried out in two stages involving a first chamber for receiving and premixing reactive polymeric components, and a second chamber intersected by the first into which the mix components are advanced while the frothing propellant is injected at the intersection. The frothed reactive polymeric mix is then discharged from the second chamber into a suitable mold for forming the finished polymerized product.
REFERENCES:
patent: 3068074 (1962-12-01), Boekemeier
patent: 3102004 (1963-08-01), Grintz
patent: 3486862 (1969-12-01), Unterstenhoefer
patent: 3771963 (1973-11-01), Breer et al.
patent: 3883121 (1975-05-01), Guillaud
patent: 3892389 (1975-07-01), Contastin
patent: 3936036 (1976-02-01), Fries
Rzucidlo Eugene C.
The Upjohn Company
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