PROCESS FOR PREPARING OPTICAL THERMOPLASTIC URETHANE RESIN LENSES AND LENSES PREPARED THEREBY

Title:

PROCESS FOR PREPARING OPTICAL THERMOPLASTIC URETHANE RESIN LENSES AND LENSES PREPARED THEREBY

Document Type and Number:

WIPO Patent Application WO/1998/047694

Kind Code:

A1

Abstract:

A process for continuously preparing lenses excellent in various optical properties which are free from variation over the whole lenses, and lenses prepared by the method. The first step of forming a thiourethane prepolymer and the second step of reacting the thiourethane prepolymer with at least one urethane forming monomer are carried out in an extruder or a reactor provided in a later step with an extruder. The extruded optical thermoplastic thiourethane-urethane copolymer is spread into a sheet and stamped out to form a lens precursor, which is then pressed so that a predetermined curved surface is imparted to at least one side of the lens precursor.

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Inventors:

YANG ZHOU (US)
ZHU ZHENYA (US)
LIN YIN-NIAN (US)
KOBAYASHI TADASHI (JP)
SAITO YUYOSHI (JP)

Application Number:

PCT/JP1998/001764

Publication Date:

October 29, 1998

Filing Date:

April 17, 1998

Export Citation:

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Assignee:

ASAHI LITE OPTICAL CO LTD (JP)
OPTIMA INC (US)
YANG ZHOU (US)
ZHU ZHENYA (US)
LIN YIN NIAN (US)
KOBAYASHI TADASHI (JP)
SAITO YUYOSHI (JP)

International Classes:

B29D11/00; G02B1/04; B29C43/00; B29C48/00; B29C48/08; (IPC1-7): B29D11/00; B29C47/00; G02B1/04; G02B3/00

Foreign References:

JPH01258919A	1989-10-16
JPH07104101A	1995-04-21
JPS63109044A	1988-05-13
JPH08208792A	1996-08-13

Other References: