发明名称 |
PHOTOREACTIVE LENSES |
摘要 |
Photoreactive plastics lenses are disclosed which are coated or impregnated with an adamantane 2-spiro-benzo or naphthopyran and with a blue colouring pho tochromic benzo- or naphthopyran having a nitrogen containing substituent in the 2-position in the pyran ring. The lenses darken in sunlight and fade rapidly at ambient temperatures in the dark or in white light which does not contain a U.V. component. The combination of the yellow/orange colouring adamantane 2-spiro pyran compound with the purple/blue colouring pyran gives a desired brown/grey colouration in the sunlight-darkened lens. The invention includes novel blue-colouring pyran compounds in which the nitrogen-containing substituent in the 2-position is a phenyl group having an amino or substituted amino or nitrogen-containing heterocyclic substituent in the ortho- or para-position of the phenyl group. |
申请公布号 |
ZA8704317(B) |
申请公布日期 |
1987.12.17 |
申请号 |
ZA19870004317 |
申请日期 |
1987.06.16 |
申请人 |
THE PLESSEY COMPANY PLC |
发明人 |
HARRY GEORGE HELLER;STEPHEN NIGEL OLIVER;JOHN WHITTALL;JACK BRETTLE;MARTIN W. BASKERVILLE;CLIVE TRUNDLE |
分类号 |
C07D295/02;C07D295/033;C07D311/92;C07D493/04;G02B3/00;G02B5/23;G02C7/10 |
主分类号 |
C07D295/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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