Polyurethane

Patent metadata

Field	Value
Publication number	US-9701779-B2
Application number	US-201314397552-A
Country	US
Kind code	B2
Filing date	May 23, 2013
Priority date	May 30, 2012
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

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—X 1 —Y—X 2 —OH (wherein X 1 and X 2 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.

First claim

The invention claimed is:

1. A polyurethane obtained by reacting:
an unsymmetric diisocyanate, a chain extender, and a polymer polyol represented by formula (I):
HO—X 1 —Y—X 2 —OH  (I)

where:
X 1 and X 2 each independently represents a polyester component comprising at least one repeating unit represented by formula (II):

where R 1 and R 2 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 X 1 and X 2 in the polymer polyol is 0.3 to 3.5.

2. The polyurethane according to claim 1 , wherein R 1 and R 2 each independently represents a hydrogen atom, and n is 5.

3. The polyurethane according to claim 1 , wherein the chain extender is an aliphatic glycol.

Assignees

• Nippon Soda Co

Inventors

• Shirai Akihiro
• Miyashita Yasunori
• Kimizuka Shinichi
• Nakamura Mitsuhiro

Classifications

• C08G18/694

  containing carboxylic ester groups · CPC title

• C08G18/3206

  aliphatic · CPC title

• C08G18/69

  Polymers of conjugated dienes {(hydrogenated polymers of conjugated dienes C08G18/6208)} · CPC title

• C08G18/664

  with compounds of group C08G18/3203 · CPC title

• C08G18/10

  Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step · CPC title