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US3766142A Expired / Lapsed US ⏱️ 0.0 years remaining

Acrylonitrile copolymers

Assignee: Imperial Chemical Industries Ltd
•
Filing: 1971-11-08
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Granted: 1973-10-16
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Expires: 1991-11-08
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Abstract

Abstract THE NOVEL COPOLYMERS CONTAIN ACRYLONITRILE (1-99 MOLES PERCENT) AND AN N-ARYLMALEIMIDE (99-1 MOLE PERCENT). THE COPOLYMERS MAY ALSO COMPRISE 25-90 MOLE PERCENT ACRYLONITRILE. FROM 1-25 MOLE PERCENT OF N-ARYL MALEIMIDE AND FROM 0-70 MOLE PERCENT OF AT LEAST ONE OTHER ETHYLNICALLY UNSATURATED MONOMOER COPOLYMERISABLE THEREWITH. WHEN THE OTHER MONOMER IS AN ALKENE OR DIENE, THE QUANTITY IS LIMITED TO THE RANGE FROM 0-50 MOLE PERCENT, AND WHERE THE OTHER MOMOMER IS AN AROMATIC OLEFIN THE MOLAR RATION OF AROMATIC OLEFIN TO ACRYLONITRILE LIES WITHIN THE RANGE 0.5-4, PREFERABLY 1-4. THE COPOLYMER IS PREPARED BY MIXING THE MONOMERS TOGETHER, PREFERABLY IN A LIQUID DILUENT AND POLYMERISING THE MIXTURE UNDER CONDITIONS OF FREE RADICAL CATALYSIS.

Inventors

  • 👤 E Nield
  • 👤 J Rose

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 13:23
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44; C08F279/00; C08F279/02; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L25/12; C08F218/00; C08F218/02; C08F218/04; C08F218/08; C08F220/04; C08F220/06; C08F222/00; C08F222/36; C08F222/40; C08F222/408; C08L51/00; C08L51/04

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-10-15 1977-04-16 1977-10-16 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-10-15 1981-04-16 1981-10-16 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-10-15 1985-04-16 1985-10-16 $7700.00 Window Closed / Lapsed

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