DE69837655D1 - Strahlungshärtbase, cyanoacrylat- enthaltende zusammensetzungen - Google Patents

Strahlungshärtbase, cyanoacrylat- enthaltende zusammensetzungen

Info

Publication number
DE69837655D1
DE69837655D1 DE69837655T DE69837655T DE69837655D1 DE 69837655 D1 DE69837655 D1 DE 69837655D1 DE 69837655 T DE69837655 T DE 69837655T DE 69837655 T DE69837655 T DE 69837655T DE 69837655 D1 DE69837655 D1 DE 69837655D1
Authority
DE
Germany
Prior art keywords
cyanoacrylate
containing compositions
radiation hardening
hardening base
base
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
DE69837655T
Other languages
English (en)
Other versions
DE69837655T2 (de
Inventor
Stan Wojciak
Shabbir Attarwala
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Henkel Corp
Original Assignee
Henkel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25190907&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DE69837655(D1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Henkel Corp filed Critical Henkel Corp
Application granted granted Critical
Publication of DE69837655D1 publication Critical patent/DE69837655D1/de
Publication of DE69837655T2 publication Critical patent/DE69837655T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F22/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides or nitriles thereof
    • C08F22/30—Nitriles
    • C08F22/32—Alpha-cyano-acrylic acid; Esters thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/46—Polymerisation initiated by wave energy or particle radiation
    • C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/46—Polymerisation initiated by wave energy or particle radiation
    • C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
    • C08F2/50—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light with sensitising agents
DE69837655T 1997-02-27 1998-02-26 Strahlungshärtbare, cyanacrylat-enthaltende zusammensetzungen Expired - Lifetime DE69837655T2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/805,193 US5922783A (en) 1997-02-27 1997-02-27 Radiation-curable, cyanoacrylate-containing compositions
US805193 1997-02-27
PCT/US1998/003819 WO1998038260A1 (en) 1997-02-27 1998-02-26 Radiation-curable, cyanoacrylate-containing compositions

Publications (2)

Publication Number Publication Date
DE69837655D1 true DE69837655D1 (de) 2007-06-06
DE69837655T2 DE69837655T2 (de) 2007-12-27

Family

ID=25190907

Family Applications (2)

Application Number Title Priority Date Filing Date
DE19880965T Ceased DE19880965T1 (de) 1997-02-27 1998-02-26 Strahlungshärtbare Cyanoacrylat-enthaltende Zusammensetzung
DE69837655T Expired - Lifetime DE69837655T2 (de) 1997-02-27 1998-02-26 Strahlungshärtbare, cyanacrylat-enthaltende zusammensetzungen

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE19880965T Ceased DE19880965T1 (de) 1997-02-27 1998-02-26 Strahlungshärtbare Cyanoacrylat-enthaltende Zusammensetzung

Country Status (26)

Country Link
US (4) US5922783A (de)
EP (1) EP0963420B1 (de)
KR (1) KR100392739B1 (de)
CN (1) CN1302081C (de)
AR (1) AR011175A1 (de)
AT (2) ATE360670T1 (de)
AU (1) AU726757B2 (de)
BR (1) BR9807804A (de)
CA (1) CA2320114C (de)
CH (1) CH689787A5 (de)
CO (1) CO5040144A1 (de)
CR (1) CR5749A (de)
DE (2) DE19880965T1 (de)
DK (1) DK199801384A (de)
ES (2) ES2286849T3 (de)
FI (1) FI982310A0 (de)
GB (1) GB2331101B (de)
ID (1) ID22231A (de)
NO (1) NO994145L (de)
NZ (1) NZ337905A (de)
PT (1) PT963420E (de)
RU (1) RU2207358C2 (de)
SE (1) SE511995C2 (de)
TW (1) TW458990B (de)
WO (1) WO1998038260A1 (de)
ZA (1) ZA981622B (de)

Families Citing this family (53)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2870610A (en) * 1955-07-25 1959-01-27 Rca Corp Thermoelectric heat pumps
US5922783A (en) * 1997-02-27 1999-07-13 Loctite Corporation Radiation-curable, cyanoacrylate-containing compositions
US6238787B1 (en) * 1997-10-01 2001-05-29 Park-Ohio Industries Method of attaching a strip to a rubber molded part
US6127445A (en) * 1998-11-03 2000-10-03 The University Of Georgia Research Foundation, Inc. Substituted benzoylferrocene anionic photoinitiators
AU7124400A (en) * 1999-09-09 2001-04-10 Loctite Corporation Radiation-curable, cyanoacrylate-containing compositions
US6734221B1 (en) 2000-09-08 2004-05-11 Loctite (R&D) Limited Radiation-curable, cyanoacrylate-containing compositions
WO2002098934A1 (de) * 2001-06-01 2002-12-12 Borealis Technology Oy Verfahren zur reaktivierung von inaktivierten koordinationskatalysatoren und vorrichtung zur durchführung des verfahrens
US6555486B2 (en) 2001-07-12 2003-04-29 Cool Shield, Inc. Thermally conductive silk-screenable interface material
US6896045B2 (en) * 2001-10-24 2005-05-24 Cool Shield, Inc. Structure and method of attaching a heat transfer part having a compressible interface
US6867241B2 (en) * 2002-01-31 2005-03-15 Henkel Corporation Radiation-curable, cyanoacrylate-containing compositions
WO2003065841A1 (en) * 2002-02-05 2003-08-14 Henkel Corporation Luminescing and/or fluorescing radiation-curable, cyanoacrylate-containing compositions
JP2003277422A (ja) * 2002-03-22 2003-10-02 Three Bond Co Ltd 光硬化性組成物
US7857748B2 (en) * 2003-01-15 2010-12-28 Syne Cor, Llc Photocurable endoprosthesis methods of manufacture
AU2003903254A0 (en) * 2003-06-27 2003-07-10 Invetech Pty Ltd Method and apparatus for sampling a fluid
US20050197421A1 (en) * 2004-03-03 2005-09-08 Loomis Gary L. Process for preparation of cyanoacrylate compositions
WO2007008971A1 (en) * 2005-07-11 2007-01-18 Henkel Corporation Toughened cyanoacrylate compositions
US7915319B2 (en) * 2005-12-19 2011-03-29 Henkel Corporation Visible light curing systems, methods for reducing health risks to individuals exposed to systems designed to cure curable compositions by exposure to radiation, methods for bonding substrates and visible light curing compositions
US20070163587A1 (en) * 2006-01-19 2007-07-19 Teibel Jeffrey L Oral respirator device and method for mask-free filtering of particulates from breathed air
US20080251195A1 (en) * 2007-04-10 2008-10-16 Abm Associates Llc Activated anaerobic adhesive and use thereof
DE102007017486B4 (de) * 2007-04-13 2009-03-05 Ekra Automatisierungssysteme Gmbh Asys Group Vorrichtung und Verfahren zum Bearbeiten von flächigen Substraten, wie zum Bedrucken von Leiterplatten oder dergleichen
US20090098073A1 (en) * 2007-10-12 2009-04-16 Macdonald John Gavin Phase change visual indicating composition
US20090098081A1 (en) * 2007-10-12 2009-04-16 Macdonald John Gavin System for providing a method for applying a skin sealant having a phase change visual indicating component
US20090123569A1 (en) * 2007-11-08 2009-05-14 Macdonald John Gavin Coverage indicating technology for skin sealants using tannates
GB2463065B (en) 2008-09-01 2012-11-07 Loctite R & D Ltd Transferable curable non-liquid film on a release substrate
US20100264566A1 (en) * 2009-03-17 2010-10-21 Suss Microtec Inc Rapid fabrication of a microelectronic temporary support for inorganic substrates
WO2010146582A2 (en) * 2009-06-15 2010-12-23 Technion- Research And Development Foundation Ltd. Reinforced surgical adhesives and sealants and their in-situ application
US8662877B2 (en) 2010-10-29 2014-03-04 Karl von Kries System, method and apparatus for solar heated manufacturing
US8901198B2 (en) 2010-11-05 2014-12-02 Ppg Industries Ohio, Inc. UV-curable coating compositions, multi-component composite coatings, and related coated substrates
WO2012173232A1 (ja) * 2011-06-16 2012-12-20 三菱レイヨン株式会社 中空糸膜モジュールの補修方法および中空糸膜モジュール
CN103205206B (zh) * 2012-01-16 2014-11-05 浙江久而久化学有限公司 一种磁材胶粘剂及其制备方法
WO2013111036A1 (en) * 2012-01-23 2013-08-01 Henkel Ireland Limited Two-part, cyanoacrylate/free radically curable adhesive systems
MX2014012169A (es) * 2012-05-07 2016-06-02 Becton Dickinson France Recubrimiento lubricante para un recipiente medico.
DE102014102455A1 (de) * 2014-02-25 2015-08-27 Seho Systemtechnik Gmbh Verfahren zum Polymerisieren von einem Kunstharz
CN103980397B (zh) * 2014-04-30 2016-02-24 中国科学院化学研究所 一种3d打印用组合物及其配制和使用方法以及制品
WO2016039129A1 (ja) * 2014-09-11 2016-03-17 ヘレウス株式会社 硬化した光硬化性樹脂組成物の製造方法及び装置
US10487244B2 (en) * 2014-10-15 2019-11-26 Toagosei Co., Ltd. 2-cyanoacrylate composition having magnetism
EP3124509A1 (de) 2015-07-31 2017-02-01 Afinitica Technologies, S. L. Schnell lichthärtende cyanoacrylatzusammensetzungen
GB2544272B (en) * 2015-11-06 2020-02-19 Henkel IP & Holding GmbH Cyanoacrylate compositions
GB2544101B (en) * 2015-11-06 2020-07-15 Henkel IP & Holding GmbH Rubber toughened cyanoacrylate compositions and uses thereof
CN105542527A (zh) * 2015-12-30 2016-05-04 曲少春 一种改进的防紫外线涂料及其制备方法
EP3423499B1 (de) * 2016-03-01 2022-06-01 Henkel IP & Holding GmbH Photohärtbare elektronenarme olefinhaltige zusammensetzungen
WO2018138547A1 (en) 2017-01-25 2018-08-02 Afinitica Technologies, S. L. Set comprising a plug connectable led and a photocurable composition
WO2018138546A1 (en) 2017-01-25 2018-08-02 Afinitica Technologies, S. L. Article comprising a batteryless light source and a photocurable composition
US11528971B2 (en) * 2018-05-13 2022-12-20 Bob Michael Lansdorp Jewelry image projection and method
US11028294B2 (en) 2018-08-10 2021-06-08 International Business Machines Corporation Armonk, New York Acrylate-cyanoacrylate monomers
DE102019108583B4 (de) 2019-04-02 2023-02-09 Gerresheimer Regensburg Gmbh Verfahren zum Verbinden eines ersten Bauteils mit einem zweiten Bauteil
WO2020206405A1 (en) * 2019-04-04 2020-10-08 Henkel IP & Holding GmbH Flexible photocurable cyanoacrylate compositions
EP4017376A1 (de) * 2019-08-20 2022-06-29 HoliStick Medical Medizinisches implantat und freisetzungsvorrichtung für ein medizinisches implantat
EP4127003A1 (de) 2020-03-31 2023-02-08 Dymax Corporation Lichthärtende hybridzusammensetzung
EP4029675A1 (de) * 2021-01-19 2022-07-20 Bostik SA Verfahren und systeme zum 3d-drucken
WO2022187848A1 (en) 2021-03-05 2022-09-09 H.B. Fuller Company Cyanoacrylate composition with hazardless stabilizer
CN113521375A (zh) * 2021-06-30 2021-10-22 东莞市瞬力新材料科技有限公司 一种光固化皮肤伤口粘合剂
EP4194523A1 (de) 2021-12-07 2023-06-14 Cuantum Medical Cosmetics, S.L. Cyanacrylatklebstoffzusammensetzung

Family Cites Families (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3702812A (en) 1971-12-23 1972-11-14 Scm Corp Photopolymerization catalyst comprising ferrocene and an active halogen-containing compound
US3717558A (en) 1972-03-30 1973-02-20 Scm Corp Photopolymerization catalyst comprising a metallocene and an active halogen-containing compound
US3855040A (en) * 1972-07-03 1974-12-17 Loctite Corp Anaerobic compositions
IE45111B1 (en) * 1976-07-14 1982-06-30 Loctite Ltd Cyanoacrylate adhesive paste compositions
IE45626B1 (en) * 1976-07-14 1982-10-20 Loctite Ltd Filled cyanoacrylate adhesive compositions
DE2909994A1 (de) * 1979-03-14 1980-10-02 Basf Ag Acylphosphinoxidverbindungen, ihre herstellung und verwendung
JPS56135455A (en) 1980-03-27 1981-10-22 Toagosei Chem Ind Co Ltd Novel 2-cyanoacrylate and curable composition
IE51863B1 (en) * 1980-08-28 1987-04-15 Loctite Corp Additive for cyanoacrylate adhesives
US4440910A (en) * 1982-01-18 1984-04-03 Loctite Corporation Toughened cyanoacrylates containing elastomeric rubbers
US4533446A (en) * 1983-07-20 1985-08-06 Loctite (Ireland) Ltd. Radiation-activatable anaerobic adhesive composition
USRE32889E (en) * 1983-08-31 1989-03-14 Loctite Corporation Thixotropic cyanoacrylate compositions
US4525232A (en) * 1984-04-16 1985-06-25 Loctite (Ireland) Ltd. Polymerizable acrylic compositions having vinyl ether additive
DE3443221A1 (de) * 1984-11-27 1986-06-05 ESPE Fabrik pharmazeutischer Präparate GmbH, 8031 Seefeld Bisacylphosphinoxide, ihre herstellung und verwendung
DE3601518A1 (de) * 1985-01-18 1986-07-24 Toagosei Chemical Industrial Co., Ltd., Tokio/Tokyo Primer
US4707432A (en) * 1985-09-23 1987-11-17 Ciba-Geigy Corporation Ferrocenium/alpha-cleavage photoinitiator systems for free radical polymerizable compositions
US4977511A (en) 1985-11-20 1990-12-11 The Mead Corporation Photosensitive materials containing ionic dye compound as initiators
US5035621A (en) 1985-11-20 1991-07-30 Mead Corporation Method of dental treatment
US4937159A (en) 1985-11-20 1990-06-26 The Mead Corporation Photosensitive materials and compositions containing ionic dye compounds as initiators and thiols as autooxidizers
US4690957A (en) * 1986-02-27 1987-09-01 Mitsubishi Denki Kabushiki Kaisha Ultra-violet ray curing type resin composition
US5300380A (en) 1986-08-06 1994-04-05 Ciba-Geigy Corporation Process for the production of relief structures using a negative photoresist based on polyphenols and epoxy compounds or vinyl ethers
WO1988002879A1 (en) 1986-10-14 1988-04-21 Loctite Corporation VISIBLE LIGHT CURABLE FREE RADICAL COMPOSITIONS CONTAINING pi-ARENE METAL COMPLEXES
EP0278685A3 (de) * 1987-02-06 1989-08-02 The Standard Oil Company Kunststoffmehrschichtstoffe mit photohärtbaren Klebstoffen und Verfahren zum Verkleben von Fluorkunststoffen mit Substraten
US4992572A (en) 1987-10-26 1991-02-12 Ciba-Geigy Corporation Process for the preparation of organometallic compounds
US5247107A (en) 1987-10-26 1993-09-21 Ciba-Geigy Corporation Process for the preparation of organometallic compounds
DE3832032A1 (de) 1988-09-21 1990-03-22 Hoechst Ag Photopolymerisierbares gemisch und daraus hergestelltes aufzeichnungsmaterial
US5047568A (en) 1988-11-18 1991-09-10 International Business Machines Corporation Sulfonium salts and use and preparation thereof
EP0393407B1 (de) * 1989-04-19 1994-06-15 National Starch and Chemical Investment Holding Corporation Klebstoff-/Dichtungsmittel-Zusammensetzung und Verfahren zu ihrer Anwendung
US5395913A (en) * 1990-03-09 1995-03-07 Rutgerswerke Ag Polymerizable epoxide mixtures and process using Lewis base complexes
RU2091385C1 (ru) * 1991-09-23 1997-09-27 Циба-Гейги АГ Бисацилфосфиноксиды, состав и способ нанесения покрытий
US5198402A (en) 1991-10-18 1993-03-30 Hitachi Chemical Company Ltd. Aryl triflate compound, radiologically acid producing agent, radiologically acid producing agent system, and radiosensitive composition
US5652280A (en) 1991-11-12 1997-07-29 University Of Georgia Research Foundation, Inc. Anionic photoinitiation
AU3141193A (en) * 1991-11-12 1993-06-15 University Of Georgia Research Foundation, Inc., The Anionic photoinitiation
US5824180A (en) * 1995-10-19 1998-10-20 Three Bond Co., Ltd. Method of bonding or decorating artificial nail
TW369554B (en) * 1995-10-19 1999-09-11 Three Bond Co Ltd Photocurable composition
JP2000508685A (ja) * 1996-04-05 2000-07-11 ミネソタ・マイニング・アンド・マニュファクチャリング・カンパニー 可視光線重合可能組成物
US5846685A (en) 1997-01-31 1998-12-08 Kodak Polychrome Graphics, Llc Radiation sensitive diazo sulfo-acrylic adducts and method for producing a printing plate
US5922783A (en) * 1997-02-27 1999-07-13 Loctite Corporation Radiation-curable, cyanoacrylate-containing compositions

Also Published As

Publication number Publication date
EP0963420B1 (de) 2007-04-25
DE69837655T2 (de) 2007-12-27
GB2331101A (en) 1999-05-12
ES2286849T3 (es) 2007-12-01
AU6863498A (en) 1998-09-18
CA2320114A1 (en) 1998-09-03
ATA900198A (de) 2005-12-15
CR5749A (es) 2000-06-16
TW458990B (en) 2001-10-11
DK199801384A (da) 1998-12-22
ZA981622B (en) 1998-09-01
WO1998038260A1 (en) 1998-09-03
CO5040144A1 (es) 2001-05-29
US5922783A (en) 1999-07-13
SE511995C2 (sv) 2000-01-10
US6726795B1 (en) 2004-04-27
EP0963420A4 (de) 2003-01-15
US6906112B1 (en) 2005-06-14
SE9803680D0 (sv) 1998-10-27
DE19880965T1 (de) 1999-07-01
NZ337905A (en) 2000-06-23
CH689787A5 (de) 1999-11-15
PT963420E (pt) 2007-08-02
FI982310A (fi) 1998-10-26
AT414126B (de) 2006-09-15
AU726757B2 (en) 2000-11-23
KR100392739B1 (ko) 2003-07-28
NO994145L (no) 1999-10-25
RU2207358C2 (ru) 2003-06-27
NO994145D0 (no) 1999-08-26
CA2320114C (en) 2012-04-17
GB9822838D0 (en) 1998-12-16
SE9803680L (sv) 1998-12-23
ID22231A (id) 1999-09-23
GB2331101B (en) 2000-11-29
FI982310A0 (fi) 1998-10-26
CN1302081C (zh) 2007-02-28
ATE360670T1 (de) 2007-05-15
ES2204202A1 (es) 2004-04-16
EP0963420A1 (de) 1999-12-15
CN1248995A (zh) 2000-03-29
BR9807804A (pt) 2000-03-28
ES2204202B1 (es) 2005-06-16
US6433036B1 (en) 2002-08-13
AR011175A1 (es) 2000-08-02
KR20000075802A (ko) 2000-12-26

Similar Documents

Publication Publication Date Title
DE69837655D1 (de) Strahlungshärtbase, cyanoacrylat- enthaltende zusammensetzungen
TR199800375A3 (tr) Selant kompozisyonlari.
DE69941101D1 (de) Strahlenhärtbare Zusammensetzungen
ID22931A (id) Komposisi-komposisi herbisidal
DE69824961D1 (de) Härtbare zusammensetzung
DE69912141D1 (de) Härtbare perfluorelastomerzusammensetzung
DE59811578D1 (de) Katalysatorzusammensetzung
DK1298194T3 (da) Staniolholdige sammensætninger
IS5430A (is) Ný samsetning
DE69803195D1 (de) Codeumsetzung
DE69905371T2 (de) Härtbare zusammensetzung
DE69930659D1 (de) Multiwellenform software funkgerät
DE69811293D1 (de) Polymerzusammensetzungen
ID25508A (id) Komposisi dematologis
DE69807911D1 (de) Vernetzbare zusammensetzung
DE69918698D1 (de) Härtbare perfluorelastomerzusammensetzung
ID21009A (id) Komposisi untuk supositori
DE69827335D1 (de) Härtbare Zusammensetzung
DE69800779T2 (de) Photopolymerisierbare Zusammensetzung
ID25650A (id) Komposisi-komposisi sampo
ID23250A (id) Komposisi paroksetin
ID21906A (id) Komposisi adesif
DE69826706D1 (de) Wäscheweichmittelzusammensetzungen
FI19992526A (fi) Sahakokoonpano
DE69925031D1 (de) Härtbare zusammensetzungen

Legal Events

Date Code Title Description
8364 No opposition during term of opposition