Foaming system for phenolic foams

Details Foaming system for phenolic foams Foaming system for phenolic foams

1985-12-20

1987-08-18

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521181, 521910, 521 98, C08J 914

Patent

active

046877878

ABSTRACT:
A mixture of CFC-113 and CFC-123 and/or CFC-123a where CFC-123 or CFC-123a is a significant portion of the total composition has been found to result in improved blowing agent performance in phenol-formaldehyde foams compared to CFC-113.
The use of CFC-123 (or CFC-123a, or both), in combination with CFC-113 improves resole resin solubility and mixed ingredient solution stability, prior to foaming. In addition, because of the lower molecular weight of CFC-123 (or CFC-123a) compared to CFC-113 better blowing agent efficiency will be realized per unit weight. Also, the lower boiling points of CFC-123 and CFC-123a as compared to CFC-113 results in a more ready conversion of dissolved blowing agent to released gaseous blowing agent by the exothermic phenolic resin polymerization. And because of the lower molecular weight and lower boiling point factors, a lower density foam is realized.

REFERENCES:
patent: 4419460 (1983-12-01), Ho
patent: 4423163 (1983-12-01), Doerge
patent: 4424289 (1984-01-01), Meyer
patent: 4525492 (1985-06-01), Rastall
patent: 4530939 (1985-07-01), Rickle
patent: 4539338 (1985-09-01), Carlson et al.

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