To provide a method for producing a low-viscosity urethane resin usable as an adhesive widely ranging from highly adhesive to slightly adhesive levels.
The method for producing the urethane resin comprises the following process: a polyol and a polyisocyanate compound are reacted with each other in such a proportion as to be excess in isocyanate group to obtain an isocyanate group-terminated prepolymer, which is then reacted with a chain extender followed by a terminal terminator. In this method, the chain extender has three or more functional groups reactive with the isocyanate groups, two of the functional groups being selected from a primary amino group, a secondary amino group and a primary hydroxy group, and the rest being selected from carboxy group(s).
HAMAZAKI KOUTA
NAKAMURA MAKIHITO
WADA HIROSHI
| JPH03227691A | 1991-10-08 | |||
| JP2003292928A | 2003-10-15 | |||
| JPH06206972A | 1994-07-26 | |||
| JP2003524042A | 2003-08-12 |
Masatake Shiga
Masakazu Aoyama
Suzuki Mitsuyoshi
Noriko Yanai
Next Patent: ETHYLENE-α-OLEFIN COPOLYMER FOR INJECTION MOLDING AND INJECTION-MOLDED PRODUCT