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US 9,701,779 B2Granted
Polyurethane
AssigneeNippon Soda Co., Ltd.
InventorsAkihiro Shirai, Yasunori Miyashita, Shinichi Kimizuka, Mitsuhiro Nakamura
Life of this patent
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Abstract
A polybutadiene having a hydroxyl group at a terminal end thereof is reacted with a lactone compound such as an ε-caprolactone to obtain a polymer polyol represented by formula (I): HO—X1—Y—X2—OH (wherein X1 and X2 each independently represents a polyester component and Y represents a polybutadiene component), the polymer polyol is reacted with an unsymmetric diisocyanate to obtain a urethane prepolymer, and then the urethane prepolymer is reacted with a chain extender to obtain a polyurethane.
Claims3
A polyurethane obtained by reacting:
- an unsymmetric diisocyanate, a chain extender, and a polymer polyol represented by formula (I):
- HO—X1—Y—X2—OH (I)
- where:
- X1 and X2 each independently represents a polyester component comprising at least one repeating unit represented by formula (II):
- where R1 and R2 each independently represents a hydrogen atom or an alkyl group, and n represents an integer of 3 to 7,
- Y represents a polybutadiene component consisting of:
- a 1,4-structure consisting of a repeating unit represented by formula (IVb);
- and
- a 1,2-structure consisting of a repeating unit represented by formula (Vb):
- wherein
- a molar ratio of the 1,2-structure/the 1,4-structure is within a range from 90.4/9.6 to 95/5, and
- a ratio of a mass of Y with reference to a total mass of X1 and X2 in the polymer polyol is 0.3 to 3.5.
9 more elements
Dependencies are inferred from the claim text.