|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||521/146 ; 521/098 ; 521/131 ; 521/142 ; 521/155 ; 521/079|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 21 인용 특허 : 21|
An improved closed cell polymer foam and foaming agent involving the use of a hydrogen-containing halocarbon blowing agent (e.g., HCFC-22) in combination with an effective amount of a hydrogen bond forming blocking agent (e.g., organic ether, ester or ketone). The presence of the blocking agent is shown to significantly reduce the escape of blowing agent from and entry of air into the foam resulting in low thermal conductivity over a longer period of time and improved thermal insulation value. A closed cell thermoplastic foam such as polyethylene, polypr...
[ What is claimed is:] [1.] A method for preparing a non-flammable insulating thermoplastic foam body comprising the steps ofa) providing a first molten composition of thermoplastic resin,b) introducing an effective quantity of a blowing agent composition, said blowing agent composition comprising at least 70 weight percent 1,1,2,2 tetrafluoroethane and no components having halogen substituents other than fluorine into said first molten compositionc) dispersing said blowing agent composition throughout said first molten composition to form a second molte...