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US 11,840,598 B2Granted
Urethane resin
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsTomohiro Hariu, Yosuke Ota
Life of this patent
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Abstract
There is provided a urethane resin that is excellent in adhesive strength, and maintains high adhesive strength even after exposure to high temperature and humidity. A urethane resin obtained by reacting a glycol-modified aromatic hydrocarbon-formaldehyde resin (A) modified with a glycol with a polyisocyanate (B) having two or more free isocyanate groups in a molecule.
Claims13
A urethane resin produced by a process comprising:
- reacting a glycol-modified aromatic hydrocarbon-formaldehyde resin (A) modified with a glycol with a polyisocyanate (B) having at least two free isocyanate groups in a molecule,
- wherein the glycol-modified aromatic hydrocarbon-formaldehyde resin (A) has a hydroxyl value of from 50 to 250 mg KOH/g, and
- wherein the glycol is at least one selected from the group consisting of neopentyl glycol, a spiroglycol, ethylene glycol, diethylene glycol, dipropylene glycol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 2,5-hexanediol, 1,2-hexanediol, 1,2-octanediol, 1,10-decanediol, 3-hexyne-2,5-diol, 2,5-dimethyl-3-hexyne-2,5-diol, 2,2,4-trimethyl-1,3-pentanediol, polyethylene glycol, and polyoxypropylene glycol.
Dependencies are inferred from the claim text.