Polyurethane resin, polyurethane resin composition, and method for manufacturing polyurethane resin

Patent metadata

Field	Value
Publication number	US-9890479-B2
Application number	US-201415029035-A
Country	US
Kind code	B2
Filing date	Oct 16, 2014
Priority date	Oct 17, 2013
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

The present invention relates to a polyurethane resin including, as constituent units, a diol (a1) having a number average molecular weight of 500 to 10,000, an organic diisocyanate (b), and a chain extender (a2). The total concentration of urethane groups and urea groups in the polyurethane resin is 1.25 to 2.50 mmol/g based on the weight of the polyurethane resin. Hard segment domains of the polyurethane resin have an average domain size of 20 to 30 nm as measured with an atomic force microscope.

First claim

The invention claimed is:

1. A polyurethane resin comprising, as constituent units:
a diol (a1) having a number average molecular weight of 500 to 10,000;
an organic diisocyanate (b); and
a chain extender (a2),
the total concentration of urethane groups and urea groups in the polyurethane resin being 1.25 to 2.50 mmol/g based on the weight of the polyurethane resin,
hard segment domains of the polyurethane resin having an average domain size of 20 to 30 nm as measured with an atomic force microscope,
wherein the chain extender (a2) comprises ethylene glycol,
wherein the polyurethane resin has a thermal softening point of 180° C. to 280° C., and
wherein the polyurethane resin satisfies the following requirements (1) to (3):
(1) the ratio of the number of moles of the diol (a1) having a number average molecular weight of 500 to 10,000 to the number of moles of an organic diisocyanate (b1) that reacts with the diol (a1) having a number average molecular weight of 500 to 10,000 is 1:1.05 to 1:1.5;
(2) the total number of moles of isocyanate groups of the organic diisocyanate (b1) and isocyanate groups of an organic diisocyanate (b2) that reacts with the chain extender (a2) is 1.3 to 4.2 times the number of moles of hydroxy groups of the diol (a1) having an number average molecular weight of 500 to 10,000; and
(3) the total number of moles of the diol (a1) having a number average molecular weight of 500 to 10,000 and the chain extender (a2) is equal to the total number of moles of the organic diisocyanate (b1) and the organic diisocyanate (b2).

2. The polyurethane resin according to claim 1 ,
wherein the polyurethane resin comprises a block (B1) and a block (B2),
the block (B1) includes the diol (a1) having a number average molecular weight of 500 to 10,000 and an organic diisocyanate (b1) that reacts with the diol (a1) having a number average molecular weight of 500 to 10,000,
the block (B1) has a number average molecular weight (M B1 ) of 4,000 to 80,000 as calculated by Formula (1):

M

B
⁢

⁢
1

=

k
×

M

a
⁢

⁢
1

+

r
×

M

b
⁢

⁢
1

r
-
k

-

M

b
⁢

⁢
1

×
2

(
1
)

wherein M a1 represents the number average molecular weight of the diol (a1) having a number average molecular weight of 500 to 10,000; M b1 represents the number average molecular weight of the organic diisocyanate (b1); k represents the number of moles of the diol (a1) having a number average molecular weight of 500 to 10,000; and r represents the number of moles of the organic diisocyanate (b1),
the block (B2) includes the chain extender (a2) and an organic diisocyanate (b2) that reacts with the chain extender (a2), and
the block (B2) has a number average molecular weight (M B2 ) of 1,400 to 25,000 as calculated by Formula (2):

M

B
⁢

⁢
2

=

i
×

M

a
⁢

⁢
2

+

j
×

M

b
⁢

⁢
2

i
-
j

+

M

b
⁢

⁢
2

×
2

(
2
)

wherein M a2 represents the number average molecular weight of the chain extender (a2); M b2 represents the number average molecular weight of the organic diisocyanate (b2

Assignees

• Sanyo Chemical Ind Ltd
• Toray Opelontex Co Ltd

Inventors

• Koike Yusuke
• FUNAOKA Shinpei
• Hori Kenzo
• Tanaka Toshihiro
• Ito Shingo
• Takayama Hiroshi

Classifications

• C09D175/08

  from polyethers · CPC title

• C08G2190/00

  Compositions for sealing or packing joints · CPC title

• D01F6/70 Primary

  from polyurethanes · CPC title

• C08G18/4883

  containing cyclic groups having at least one oxygen atom in the ring · CPC title

• C08G18/4858

  Polyethers containing oxyalkylene groups having more than four carbon atoms in the alkylene group · CPC title