Reactive compositions with an extended pot life

US6624282B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Stefan Groth · Leverkusen, DE
• Josef Pedain · Cologne, DE
• Lutz Schmalstieg · Neunburg vorm Wald, DE
• Detlef-Ingo Schutze · Recklinghausen, DE

Key dates

• Filing date: Aug 7, 1997
• Grant date: Sep 23, 2003
• Expiry date: Aug 7, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/6677
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to reactive compositions containing(A) NCO prepolymers based on (cyclo)aliphatic polyisocyanates having an NCO content of 1 to 8 wt. % and a monomeric polyisocyanate content of less than 2 wt. %,(B) amine-free chain extenders containing at least 50 equivalent percent of a compound melting between 50° and 160° C. having formula (I)HO—X—Y—X—OH  (I) whereinY denotes methylene, ethylene, —C≡C—, 1,4-, 1,3-, or 1,2-cyclohexylene, or 1,4-, 1,3-, or 1,2-phenylene, andX denotes methylene, —OCH2CH2— (wherein oxygen is bonded to group Y), or 1,4-, 1,3-, or 1,2-cyclohexylene, and(C) 0 to 20 wt. %, relative to component (A), of inert organic solvents,wherein the equivalent ratio of the free NCO groups of component (A) to the NCO-reactive groups of component (B) is 0.90 to 1.35.