Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Nonmechanical aftertreatment
Patent
1991-10-11
1994-03-29
Thomas, Alexander S.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Nonmechanical aftertreatment
428 1, 359 73, G02F 11333
Patent
active
052981991
ABSTRACT:
Ionomer resin sheet is stretched in one direction in the plane of sheet to give uniaxial anisotropy, and then heated above the melting point under pressure to cause relaxation of the anisotropy. After cooling, a sheet of biaxial anisotropy is obtained. The degree of anisotropy depends on the initial stretching, heating temperature, heating time and pressure.
REFERENCES:
patent: 4385806 (1983-05-01), Fergason
patent: 4514452 (1985-04-01), Tanaka et al.
patent: 4701028 (1987-10-01), Clerc
patent: 4813770 (1989-03-01), Clerc et al.
Clerc Jean F.
Hirose Shin-ichi
Stanley Electric Co. Ltd.
Thomas Alexander S.
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