Resin composition and film using same

Patent metadata

Field	Value
Publication number	US-2016264813-A1
Application number	US-201414405541-A
Country	US
Kind code	A1
Filing date	Mar 7, 2014
Priority date	Oct 10, 2013
Publication date	Sep 15, 2016
Grant date	—

Abstract

The present invention is a resin composition characterized by being able to undergo elastic deformation, having little residual strain rate and exhibiting stress relaxation properties. More specifically, the present invention relates to a resin composition wherein the stress relaxation rate (R) and the residual strain rate α, as measured in a prescribed extension-restoration test, are as follows: 20%≦R≦95% and 0%≦α≦3%.

First claim

1 - 8 . (canceled)

9 . A resin composition characterized by being able to undergo elastic deformation, having little residual strain rate and exhibiting stress relaxation properties, wherein the stress relaxation rate (R) and the residual strain rate (α), as measured in a tensile-compression test described below, satisfy the following relationships:
20%≦ R≦ 95% and

0%≦α≦3%

<Extension-restoration test>
a piece of resin composition (thickness: 50 micrometer, sample shape: No. 6 type dumbbell (width of measured portion: 4 mm, length of linear portion: 25 mm)) being subjected to an extension process and then a restoration process under the conditions described below using a tensile-compression tester in accordance with ISO 3384, and the stress relaxation rate (R) and the residual strain rate (a) being calculated using the calculation methods described below,

Extension process conditions:
in order to eliminate deflection generated when the test piece is attached to a clamp, deflection correction being carried out at a force of 0.05 N or lower,
Speed of testing: 25 mm/min (0 to 25% extension)
Temperature conditions: 23 degrees Celsius
Extension/holding conditions: Holding for 5 minutes at 25% extension Restoration process conditions:
Speed of testing: 0.1 mm/min (until the tensile force reaches 0±0.05 N)
Temperature conditions: 23 degrees Celsius

Stress relaxation rate calculation method: the tensile force being measured at the point when the extension process is complete, and this being defined as the initial tensile force (F A0 ), then the amount of strain being maintained for 5 minutes under the extension/holding conditions, after which the tensile force is measured, and this being defined as F A (t 5 ), with the stress relaxation rate (R) being calculated using the following formula:

R
=

F
AO

-

F
A



(

t



5

)

F
AO

×
100

Residual strain rate calculation method: the amount of strain being measured at the point where the tensile force in the restoration process reaches 0±0.05 N, and this being defined as the residual strain rate (a).

10 . The resin composition according to claim 9 , wherein when the degree of extension is 15 to 20% in the extension-restoration test, the slope of the change in tensile force relative to the amount of strain during restoration and that during extension satisfy the following formula: slope during restoration/slope during extension ≦0.95.

11 . The resin composition according to claim 9 , wherein a stress value measured at the point of maximum extension (25% extension) is a maximum stress value in the extension-restoration test, and
in cases where measurements are started at the point where the extension process is complete in the stress relaxation properties test described below, the tensile force (F B0 ) immediately after completion of the extension process and the tensile force (F B (t 30 )) 30 minutes after completion of the extension process satisfy the following formula:
0.1≦ F B ( t 30 )/ F B0 ≦0.7

<Stress relaxation properties test>
a piece of resin composition (thickness: 50 micrometer, sample shape: No. 6 type dumbbell (width of measured portion: 4 mm, length of linear portion: 25 mm)) being subjected to an extension process under the conditions described below using a tensile-compression tester in accordance with ISO 3384, and at the point where the extension is complete, the tensile force being measured and defined as the initial tensile force (F 0 ). 30 minutes thereafter, the tensile force (F B (t 30 )) being measured,

Extension process conditions:
in order to eliminate deflection generated when the test piece is attached to a clamp, deflection correction being carried out at a force of 0.05 N or lower.
Speed of testing: 25 mm/min (up to 50% extension)
Temperature conditions: 23 degrees Celsius
Extension/holding conditions: holding for 30 minutes at 50% extension.

12 . The resin composition according to claim 9 , wherein even when the tests are repeated two or more times, the resin composition behaves in such a way that the formulae described in claim 1 are still satisfied.

13 . The resin composition according to claim 9 , which further contains at least a thermosetting resin and a curing agent for this resin.

14 . The resin composition according to claim 13 , wherein the thermosetting resin is an epoxy resin.

15 . A film prepared by using the resin composition according to claim 9 .

Assignees

• Panasonic Ip Man Co Ltd
• Panasonic Ip Man Co Ltd

Inventors

• Sawada Tomoaki
• Abe Takatoshi
• Yoshioka Shingo

Classifications

• C08J7/0427

  with only one layer of a composition containing a polymer binder (with more layers C08J7/042) · CPC title

• B32B2260/046

  Synthetic resin · CPC title

• C08J2367/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) · CPC title

• H05K2201/0326

  Inorganic, non-metallic conductor, e.g. indium-tin oxide [ITO] · CPC title

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title