Abherent compsition

Details Abherent compsition Abherent compsition

1995-12-22

2003-03-11

Short, Patricia A (Department: 1712)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C524S139000, C524S142000, C524S144000, C524S146000, C524S269000, C525S101000, C525S104000

Reexamination Certificate

active

06531525

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a composition containing a fluorine-containing compound and giving a non-tackiness between articles. The present invention also relates to an anti-blocking agent, wire stripping agent and mold release agent comprising said composition as an active component.
RELATED ART
A material preventing the adhesion between the same materials or between different materials is required. For instance, in the case of the preparation of a shaped product made of, for example, cement, ceramics, or a polymeric material such as a synthetic resin or rubber, a mold release agent is frequently used in order to easily demold the shaped product from a (metal) mold.
In a coaxial cable having a shield layer formed from the braided metal small-gage wires on insulated electrical wire, an easy terminal treatment operation is desired by increasing a separation property between the shield layer and the insulated electrical wire. Also in the case of a cable prepared by applying a protective coating to several associated insulated electrical wires, a good separation property between the insulated electrical wires and the protective coating is important for the easy terminal treatment operation.
When rubber materials before or after the vulcanization are piled, the rubber materials adhere to each other due to the tackiness of the rubber materials themselves so that it is difficult to peel one rubber material from the other rubber material. Namely, a blocking phenomenon arises. In order to prevent the blocking phenomenon, it is necessary to use an anti-blocking agent in many cases.
For example, a natural or synthetic compound such as a silicone oil, a mineral oil, a paraffin wax, a fatty acid derivative and a glycol and an inorganic material such as talc and mica and the like are conventionally used as a mold release agent used for an easy separation from the mold during the molding process of the polymeric material and the like. Generally these mold release agents are coated on the mold before introducing the molded product in the mold. When a mold release life is short, the mold release agent is usually coated on the mold every molding process.
It is difficult to coat homogeneously the inorganic material such as talc and mica on the mold so that the inorganic material suffers from an insufficient mold releasability and a bad operation environment due to the scatter of powder.
The silicone oil is the most universally used mold release agent because of the good mold releasability. When the silicone oil is used for molding a material having a strong adhesion property such as a urethane or epoxy resin, it is necessary to coat the mold with the large amount of the silicone oil having an improved strength of a mold release agent film by the addition of fine powder such as silicon oxide. The large amount of the coating gives the migration of the mold release agent to the molded product so that it is difficult to conduct a post-treatment of a surface of the molded product, for example, a coating or adhesion treatment. In addition, the large amount of the coating is economically disadvantageous.
When the molding process is continued by coating the large amount of the mold release agent on the same mold, the tailings of the mold release agent or molded product remain on a mold surface and the mold must be often washed so as to decrease the efficiency of molding process.
A mold release agent comprising a phosphate ester of an alcohol having a perfluoroalkyl group and a silicone oil is known (cf. Japanese Patent Kokoku Publication No. 23270/1978) and is useful as a mold release agent for a resin having a high tackiness such as an epoxy resin.
However, when the mold release agent described in the above Publication is used as a stripping agent for facilitating a terminal processing operation of an electrical wire or an anti-blocking agent for a vulcanized or unvulcanized rubber, said mold release agent gives insufficient effect. The silicone oil and the inorganic material such as talc and mica also give insufficient effect. Talc and mica have the same problem as in the use of the mold release agent in addition to the insufficient effect.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an abherent composition which can be used as a mold release agent, a stripping agent for an electrical wire and an anti-blocking agent for a synthetic resin and a vulcanized or unvulcanized rubber.
A gist of the present invention resides in a composition giving a abherent property to a substrate and comprising
(A) a compound having a C
4
-C
20
perfluoro-alkyl or alkenyl group,
(B) polytetrafluoroethylene having a number-average molecular weight of at most 500,000, and
(C) at least one compound selected from the group consisting of a silicone oil, a silicone resin and a highly fluorinated compound having a boiling point of at least 100° C. (except those included in the components (A) and (B)).
The other gist of the present invention resides in an anti-blocking agent, a stripping agent for an electrical wire and a mold release agent which contain said composition as an active component.
Hereinafter, the present invention will be explained in detail.
DETAILED DESCRIPTION OF THE INVENTION
Examples of the compound having the C
4
-C
20
perfluoro-alkyl or alkenyl group which is one component of the composition according to the present invention are a phosphate ester or a salt thereof, a phosphonic acid derivative and a phosphinic acid derivative having a C
4
-C
20
perfluoro-alkyl or alkenyl group, and a homopolymer or copolymer of a monosubstituted ethylene or a (meth)acrylate ester having a C
4
-C
20
perfluoro-alkyl or alkenyl group. The phosphate ester or salt thereof having the perfluoro-alkyl or alkenyl group is particularly preferable.
The preferable example of the perfluoro-alkyl or alkenyl group-containing phosphate ester or salt thereof used in the present invention is a compound having the following formula in which one or two hydrogen atom of three hydroxyl groups in phosphoric acid (orthophosphoric acid, a chemical formula: H
3
PO
4
or PO(OH)
3
) is substituted with an organic group having C
4
-C
20
perfluoro-alkyl group:
(R
f
RO)
n
PO(OH)
3−n
wherein R
f
is a C
4
-C
20
perfluoroalkyl group,
n is an integer of 1 to 2,
R is a divalent organic group of the formula: —CH
2
CH(Z)C
m
H
2m
— or —SO
2
N(R′)C
l
H
2l
—
(wherein Z is H, CH
3
, C
2
H
5
, Cl or OR″ (R″ is H, CH
3
, C
2
H
5
, COCH
3
, COC
2
H
5
or —CH
2
COOH or a salt thereof), m is an integer of 0 or 1-4, R′ is a C
1
-C
4
alkyl group, and l is an integer of 1-4, or salt thereof. Specific examples of the salt are an alkaline metal salt, an ammonium salt and an amine salt.
Particularly preferable perfluroalkyl group-containing phosphate ester is the perfluoroalkyl group-containing phosphate ester having the above formula in which R
f
is a C
7
-C
20
perfluoroalkyl group, R is an alkylene group, a —CH
2
CH(Z)C
m
H
2m
— group (wherein Z is OH or —OCOCH
3
) or —SO
2
N(R′)C
l
H
2l
— (wherein R′ is CH
3
or C
2
H
5
).
Specific examples of the perfluoroalkyl group-containing phosphate ester are as follows:
(A) [(CF
3
)
2
CF(CF
2
CF
2
)
i
CH
2
CH(OH)CH
2
O]
n
PO(OH)
3−n
(wherein i is an integer of at least 1)
(B) [C
8
F
17
SO
2
N(C
2
H
5
) CH
2
CH
2
O]
n
PO(OH)
3−n
(C) (C
7
F
15
CH
2
CH
2
O)
n
PO(OH)
3−n
(D) (CF
3
)
2
CF(CF
2
CF
2
)
i
CH
2
CH
2
CH
2
OPO(OH)
2
(wherein i is an integer of at least 1)
(E) (CF
3
)
2
CF(CF
2
CF
2
)
3
CH
2
CH(Cl)CH
2
OPO(OH)
2
(F) (CF
3
)
2
CF(CF
2
CF
2
)
3
CH
2
CH(CH
3
)OPO(OH)
2
(G) (CF
3
)
2
CF(CF
2
CF
2
)
3
CH
2
CH(OCH
2
COOH)CH
2
OPO(OH)
2
The perfluoro-alkyl or alkenyl group-containing phosphate ester and salt thereof used in the present invention can be used alone or in combination of at least two.
The perfluoro-alkyl or alkenyl group-containing phosphonic acid derivative or phosphinic acid derivative used in the present invention is preferably of the formula:
wherein R
f
is a C

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