|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||521/114 ; 521/131 ; 264/DIG.5|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 11 인용 특허 : 11|
Rigid foams having improved insulation properties are made by reacting a polyisocyanate with an isocyanate-reactive material in the presence of a blowing agent mixture composed of from about 1 to about 30% by weight of at least one C.sub.2 -C.sub.5 polyfluoroalkane and from about 70 to about 99% by weight of an HCFC, preferably an HCFC selected from chlorodifluoromethane, 1,1-dichloro-1-fluoroethane, 1-chloro-1,1-difluoroethane and mixtures thereof.
[ What is claimed is:] [1.] A process for the production of rigid foams having improved insulation properties comprising reactinga) an organic isocyanate withb) an isocyanate reactive compound in the presence ofc) a blowing agent mixture consisting of(1) from 1 to 30% by weight, based on the total weight of c) of at least one C.sub.3 -C.sub.5 polyfluoroalkane represented by the formula EQU CX.sub.3 --CY.sub.2 --Rin whichX represents hydrogen or fluorneY represents hydrogen, fluorine or CF.sub.3 andR represents H, F, CH.sub.2 F, CHF.sub.2, CH.sub.3,CF.sub...