公开(公告)号：SE327081B

公开(公告)日：1970-08-10

申请号：SE838166

申请日：1966-06-20

Applicant: STANDARD OIL CO

Inventor： ISLEY R ,  BLOWER K

IPC: C08J3/09 ,  B29D7/02 ,  B29D7/24 ,  B29D23/04 ,  C08F47/00

Abstract: 1,155,583. Acrylonitrile polymer films. STANDARD OIL CO. 21 June, 1966 [23 June, 1965], No. 27639/66. Heading B5B. [Also in Division C3] "Dry blends" (i.e. blends which have the appearance and handling characteristics of a dry material) comprising an intimate admixture of 45-80% by weight of a particulate, resinous acrylonitrile polymer containing at least 90% by weight of acrylonitrile units and having a surface area of at least 10 sq. m. per gram, and 55-20% by weight of a solvent for the acrylonitrile polymer can be shaped into a film or web by plastifying and thermoforming the blend at elevated temperature, stretching the solvent-containing form in one or more directions, and then drying or heat-setting (the orientation of solvent-containing acrylonitrile polymer films is described in Specification 1,113,805). Stretching may be effected in two mutually perpendicular directions simultaneously or sequentially, e.g. first in a drafter having two hot rolls and two cold rolls and then in a tenter. The films obtained are suitable as barriers for gases and vapours and can be used for magnetic tape, surfacing and laminating, packaging, electrical insulation, pressure sensitive adhesive tape and glazing. In an example, a biaxially orientated film is obtained from a dry blend comprising an acrylonitrile-butanediol- 1,4-divinyl ether copolymer, dimethylformamide and ethylene carbonate.