Title:
METHOD FOR PRODUCING POLYURETHANE RESIN, AND POLYURETHANE RESIN
Document Type and Number:
WIPO Patent Application WO/2023/048033
Kind Code:
A1
Abstract:
A polyisocyanate ingredient including bis(isocyanatomethyl)cyclohexane is reacted with a polyol ingredient including a macropolyol in such a proportion that the equivalent ratio (NCO/OH) exceeds 1.0 to thereby obtain a prepolymer composition including an isocyanate-group-terminated prepolymer. The prepolymer composition is reacted with a chain extender to synthesize a polyurethane resin. Antioxidants are added in the prepolymer production step and/or the chain extension step. The antioxidants include a both-hindered phenolic antioxidant and a phosphite-based antioxidant. The proportion of the both-hindered phenolic antioxidant is 0.30-1.00 part by mass per 100 parts by mass of the prepolymer composition. The reaction between the prepolymer composition and the chain extender is conducted at a temperature of 120-140°C.
Inventors:
MAEKAWA KAZUHIRO (JP)
HASHIGUCHI TAKUYA (JP)
HASHIGUCHI TAKUYA (JP)
Application Number:
PCT/JP2022/034310
Publication Date:
March 30, 2023
Filing Date:
September 14, 2022
Export Citation:
Assignee:
MITSUI CHEMICALS INC (JP)
International Classes:
C08G18/08; C08G18/10; C08G18/65; C08G18/75
Domestic Patent References:
| WO2019230541A1 | 2019-12-05 | |||
| WO2013015242A1 | 2013-01-31 | |||
| WO2015133495A1 | 2015-09-11 | |||
| WO2016098772A1 | 2016-06-23 |
Foreign References:
| JP2010528158A | 2010-08-19 |
Attorney, Agent or Firm:
OKAMOTO, Hiroyuki et al. (JP)
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