US 10,697,077 B1Granted

Electrolytic copper foil

AssigneeChang Chun Petrochemical Co., Ltd.

InventorsChien-Ming Lai, Yao-Sheng Lai, Jui-Chang Chou

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Abstract

Provided is an electrolytic copper foil. The electrolytic copper foil has a drum side and a deposited side, wherein ΔRz is less than 0.8 μm; the electrolytic copper foil has a transverse direction, wherein the electrolytic copper foil is divided into 10 test pieces with the same width and the same length, and each two adjacent ones of the 10 test pieces have a weight deviation therebetween, and a count of the weight deviation(s) greater than or equal to 1.5% is smaller than a count of the weight deviations smaller than 1.5%; wherein n represents any one of the test piece numbers from 1 to 9, and the weight ⁢ ⁢ deviation ⁢ ⁢ between ⁢ ⁢ each ⁢ ⁢ two ⁢ ⁢ adjacent ⁢ ⁢ ones ⁢ ⁢ of ⁢ ⁢ the ⁢ ⁢ 10 ⁢ ⁢ test ⁢ ⁢ pieces ⁢ ⁢ ( % ) =  the ⁢ ⁢ weight ⁢ ⁢ of ⁢ ⁢ test ⁢ ⁢ piece ⁢ ⁢ ( n ) - the ⁢ ⁢ weight ⁢ ⁢ of ⁢ ⁢ test ⁢ ⁢ piece ⁢ ⁢ ( n + 1 )  the ⁢ ⁢ smaller ⁢ ⁢ weight ⁢ ⁢ in ⁢ ⁢ test piece ⁢ ⁢ ( n ) ⁢ ⁢ and ⁢ ⁢ test ⁢ ⁢ piece ⁢ ⁢ ( n + 1 ) × 100 ⁢ % .

Claims11

Dependent claims

An electrolytic copper foil comprising:

a drum side and a deposited side opposite the drum side;
an absolute value of a difference in surface roughness between the deposited side and the drum side being less than 0.8 μm;
and
wherein the electrolytic copper foil having a transverse direction and a machine direction, wherein when the electrolytic copper foil is divided into 10 test pieces with the same width and the same length along the transverse direction, and when a weight deviation between each two adjacent ones of the 10 test pieces is obtained, there are a total of 9 sets of weight deviations among the 10 test pieces, and then the following conditions are satisfied:
(1) a total count of the weight deviation(s) greater than or equal to 1.5% is smaller than a total count of the weight deviations smaller than 1.5%;
and (2) at least one of the 9 sets of the weight deviations is greater than 0.00% and equal to or smaller than 2.20%, with the other(s) of the 9 sets of the weight deviation(s) being equal to or greater than 0.00% and equal to or smaller than 2.20%,
wherein the weight deviation between each two adjacent ones of the 10 test pieces is calculated by the following formula, wherein n represents any one of the test piece numbers from 1 to 9:
the
⁢
⁢
weight
⁢
⁢
deviation
⁢
⁢
between
⁢
⁢
each
⁢
⁢
two
⁢
⁢
adjacent
⁢
⁢
ones
⁢
⁢
of
⁢
⁢
the
⁢
⁢
10
⁢
⁢
test
⁢
⁢
pieces
⁢
⁢
(
%
)
=

the
⁢
⁢
weight
⁢
⁢
of
⁢
⁢
test
⁢
⁢
piece
⁢
⁢
(
n
)
-
the
⁢
⁢
weight
⁢
⁢
of
⁢
⁢
test
⁢
⁢
piece
⁢
⁢
(
n
+
1
)

the
⁢
⁢
smaller
⁢
⁢
weight
⁢
⁢
in
⁢
⁢
test
piece
⁢
⁢
(
n
)
⁢
⁢
and
⁢
⁢
test
⁢
⁢
piece
⁢
⁢
(
n
+
1
)
×
100
⁢
%
.

128 more elements

Dependencies are inferred from the claim text.