|국가/구분||United States(US) Patent 등록|
|국제특허분류(IPC7판)||B32B-007/02 B32B-027/36 C08F-220/14|
|미국특허분류(USC)||428/215 ; 428/220 ; 428/412 ; 428/421|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 16 인용 특허 : 0|
Extruded, smooth finished solid sheet or film, which may have a thickness 50°C., which under conditions of orientation displays optical birefringence, may be manufactured into a flat strip with smooth finished surfaces, to yield a strip which has characteristics as follows: optical birefringence path difference less than or equal to 50 nm (single pass); low surface roughness; low variation in thickness; by extrusion of the plastic in a thermoplastic state, through a slot nozzle; wherein during or after the smoothing of the two surfaces one of the surface...
An extruded sheet or film of a thermoplastic plastic having a glass transition temperature >50°C. and a thickness 1 mm; wherein said thermoplastic plastic is selected from the group consisting of polymethyl methacrylate, polyacrylonitrile, polyvinyl chloride, polyvinylidene fluoride, polymethylpentene, polystyrene polyvinyl carbozole, bisphenol-A polycarbonate, polyethylene terephthalate, an aromatic polyether sulfone and polybudadiene, and said thermoplastic plastic ha one or more of the following properties: a) a variation in thickness not exceeding 0....