Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1998-04-10
1998-11-17
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
264175, 521173, G08G 1842
Patent
active
058377433
ABSTRACT:
Closed cell, rigid polymer foams are prepared by (a) continuously conveying a carrier along a production line, (b) supplying on the carrier a foam-forming mixture comprising a polyisocyanate, a catalyst, a hydrogen-containing blowing agent or a mixture of the hydrogen-containing blowing agent and at least one co-blowing agent, and an isocyanate-reactive component comprising (i) a high acid polyester polyol having an acid number greater than 1, or (ii) a mixture of the high acid polyester polyol and at least one other isocyanate-reactive compound, (c) passing the carrier and mixture between two constricting members forming therebetween a metering gap, and (d) allowing the mixture after passing through the gap to freely expand to form a plastic foam, wherein the acid number and amount of the high acid polyester polyol in the mixture are sufficiently high to result in a superior resistance to cold temperature shrinkage.
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Godbey Judy Ann
Londrigan Michael Edward
Lynn Gregory W.
Celotex Corporation
Foelak Morton
Vanecek Charles W.
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