Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1989-01-31
1990-01-02
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521 76, 521134, 521139, 521140, 521150, C08J 900, C08J 932
Patent
active
048913871
ABSTRACT:
This invention is directed to the use of microencapsulated blowing agents in the bulk polymerization of cycloolefin monomers by ring-opening polymerization. These microencapsulated blowing agents aid in filling molds during reaction injection molding procedures such that both surfaces of the article being molded remain in contact with their respective mold surfaces eliminating sink marks in these surfaces. In addition, the microencapsulants may be introduced at higher levels which provide structural foams with the polymers from cycloolefin monomers.
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Foelak Morton
The B. F. Goodrich Company
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