Unsaturated polyester resin capable of entrapping an inert gas t

Details Unsaturated polyester resin capable of entrapping an inert gas t Unsaturated polyester resin capable of entrapping an inert gas t

1977-10-03

1979-04-24

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

260 16, 260857D, 260857UN, 260857PE, 260861, 260862, 521183, C08J 930

Patent

active

041513355

ABSTRACT:
Unsaturated polyester resins having an acidity number of 5-90 mg. KOH/g. a molecular weight of 500-5000 and which are capable of entrapping air or other inert gases so as to form structural foams and which contain in the chain 0.1 to 20 mol% of amide to the minimum acceptable link section size. Acceptable chain links are therefore excluded from fitting into the opening whereas worn chain links which have been worn to a degree which equals or exceeds the limit of permissible wear slide into the opening thereby indicating that the chain should be removed from service.

REFERENCES:
patent: 3502602 (1970-03-01), Helm et al.
patent: 3975348 (1976-08-01), Christena

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