|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||528/051 ; 528/075 ; 525/417 ; 524/707|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 23 인용 특허 : 0|
A robust polyurethane liner is disclosed for solid propellant rocket motors which is insensitive to large variations in stoichiometry, exhibits increased cohesive strength and, when used in combination with a unique two coat (wet coat) liner process described below, modifies the ballistic properties of the adjacent interfacial propellant layer. The liner compositions include a polymeric binder having a plurality of reactive hydroxyl functional groups and a curing agent having a plurality of reactive isocyanate functional groups. The quantity of binder an...
[ The claimed invention is:] [1.] A solid rocket propellant polyurethane liner composition comprising:a polymeric binder having a plurality of reactive hydroxyl functional groups and a curing agent having a plurality of reactive isocyanate functional groups, wherein the quantity of binder and curing agent are selected such that the NCO/OH equivalents ratio is in the range from 1.5 to 4.5;a bonding agent present in the liner composition in an amount ranging from about 3% to about 5%, by weight; anda catalyst system consisting of a latent oligomer catalyst...