Patent ID: 6512043
Filing Date: 2003-01-28
Classification: C09J

Abstract:
A two-part adhesive composition comprising an adhesive prepared by combining an adhesive part and an activator part, wherein said adhesive part comprises acrylic and/or methacrylic monomers, reducing agents, an inhibitor, impact modifiers, and toughening agents, wherein said activator part comprises at least one initiator, and wherein said adhesive composition has a working time of approximately 40 minutes or longer at a temperature of 95Â° F. and said reducing agents being selected from the group consisting of(a) at least one aniline having the following formula: wherein Râ€² and Râ€³ are â€”CH3 or â€”C2H5 and may be same or different,(b) at least one ortho-toluidine or meta-toluidine having the following formula: wherein for ortho-toluidines, Râ€² and Râ€³ are only â€”CH3, for meta-toluidines, Râ€² and Râ€³ are â€”CH3, or CH2CHY2, where Y is H, a weak electron-releasing group or a strong electron-withdrawing group selected from alkyl groups with C1 to C6, OH, CN, a halogen, OCnH2n+1 with n less than 4, OOCCH3 and wherein Râ€² and Râ€³ may be the same or different,(c) at least one substituted meta-aniline or substituted para-aniline having one of the following formulas: wherein Râ€²â€³ is a halogen, OR where R has C1 to C6, COOCnH2+1 with n up to 10 and Râ€² and Râ€³ are â€”CH3 or â€”C2H5 and wherein Râ€² and Râ€³ may be same or different,(d) at least one substituted meta-toluidine or substituted para-toluidine having one of the following formulas: wherein Râ€²â€³ is CHZâ€²Zâ€³ or CH2Zâ€², where Zâ€² and/or Zâ€³ is an alkyl group with C1 to C6, a halogen, OH, OR where R has C1 to C6, COOCnH2n+1 with n up to 10, and the like, wherein Zâ€² and/or Zâ€³ may be the same, and wherein Râ€² and Râ€³ are â€”CH3, or CH2CHY2, where Y is H, a weak electron-releasing group or a strong electron-withdrawing group selected from alkyl groups with C1 to C6, OH, CN, a halogen, OCnH2n+1 with n less than 4, OOCCH3 and wherein Râ€² and Râ€³ may be the same or different, and(e) at least one reducing agent as described in (a), (b), (c) or (d) in combination with at least one para-toluidine, said para-toluidine being in an amount up to 30 mole percent of the total amount of reducing agent in the adhesive and having the following formula: wherein Râ€² and Râ€³ are â€”CH3, or CH2CHY2, where Y is H, a weak electron-releasing group or a strong electron-withdrawing group selected from alkyl groups with C1 to C6, OH, CN, a halogen, OCnH2+1 with n less than 4, OOCCH3 and Râ€² and Râ€³ may be the same or different.